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HP Saw 436A User's Manual

1. mm 061 SHEET 7 016 Figure 8 15 Operating Program Flow Chart 58 of 14 Service 8 31 450A LOCAL REMOTE BRANCH SUBROUTINE SHEET 4 DISPLAY ANO TALK SUBROUTINE SHEET 14 LOCAL INITIALIZE SUBROUTINE COUNT RANGE X DRE COUNTER DOWN TO RANGE 10AD MODE SELECT REGISTERS DULCE FROM REMOTE INITIALIZE SUBROUTINE SHEET 5 D 4 UNDERRANGE SUBROUTINE SHEET 11 OVERRANGE SUBROUTINE SHEET 12 DELAY SUBROUTINE SHEET 13 AUTO ZERO SUBROUTINE 056 CLEAR MAIN COUNTER AUTO ZERO 0 CONVERTER 18000 COUNTS CLEAR MAIN COUNTER Maa Rap TO MEASUREMENT SUBROUTINE SHEET 7 Figure 8 15 Operating Program Flow Chart 6A of 14 8 32 Cu 7 amma 436 Service LOCAL INITIALIZE SUBROUTINE FROM 026 SHEET 4 025 SHEET 14 A 016 030 SHEET 5 1 105 SHEET 11 056 906 120 122 SHEET 13 145 146 SHEET 12 lt gt 15 15 CD Figure 8 15 Operating Program Flow Chart 68 of 14 8 33 Service 7a MEASUREMENT SUBROUTINE TO LINEAR POSITIVE 8 34 ENABLE LINEAR POSITIVE CONVERSION RAMP
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3. 136 SHEET 10 SUBROUTINE U4 SHEET 11 106 gt 1200 COUNTS AUTO RANGE gt 1100 COUNTS UNDER RANGE 20R3 CONVERSION SUBROUTINE SUBROUTINE 100 1200 lt 1100 COUNTS COUNTS RANGE HOLD AUTO RANGE AUTO RANGE 4085 170 SHEET 11 147 SHEET 12 1080 AUTO RANG E OVER RANGE 2 3 OR 4 SUBROUTINE RANGE 1 RANGE HOLD AUTO RANGE 5 047 SHEET 12 035 13 OVER UNDER RANGE CONTINUE SUBROUTINE RELATIVE 88 SUBROUTINE 77 SHEET 14 DISPLAY AND TALK SUBROUTINE REMOTE TALK OR REMOTE HOLD NOT SELECTED LOCAL Figure 8 15 Qperating Program Flow Chart 1 of 14 8 25 450A 2 PROGRAM TIMING QUALIFIER INPUTS 18 QUALIFIER SELECT CODE NEXT ABDRESS SELECT CODE LINE SELECTOR QUALIFIER _ BIT QUALIFIER REGISTER Q QUALIFIER Y12 Y15 INSTRUCTION 1 INSTRUCTION REGISTER INSTRUCTIONS 16 NOTE 1 FOR ROM OUTPUTS LOGICAL 1 V 1 1 13 ys 2 Tia NEXT ADDRESS SELECT BITS CLOCKED INTO T2 QUALIFIER CLOCKED INTO QUALIFIER REGIS STATE REGISTER AND APPLIED TO ROM ROM TER AND APPLIED TO ROM AS ADDRESS OUTPUTS ADDRESSED WORD MODIFIER ROM OUTPUTS ADDRESSED WORD b QUALIFIER OUTPUT GF LINE SELECTOR DETER T3 INSTRUCTION REGISTER ENABLED INSTRUCTION MINED BY QUALIFIER SELECT CODE CODE SELECTS OUTPUT 74 1
4. N CD H High L Low X Don t care condition Figure 8 9 3 Line 8 Line Decoder 8 12 la Model 436A Truth Table X Y Sel Input 124 Gg Selected morcm or x X X LE LL L H L H H L H H am 69 3 STATE OF CO BO CO C Qj wm C NJ Do WR O A High L Low X Don t care condition Z High impedance Figure 8 10 8 Input Data Selector Multiplexer 8 49 Latches on the four data inputs are con trolled by the gate G2 input When G2 is low the states of the outputs are determined by the input data code When G2 goes high the last data code present at the input to the latches is stored and the output remains stable 8 50 The display driver also has provision for automatic blanking and zero suppression via the ripple blanking input RBI G1 and the ripple blanking output RBO respectively The G1 line always serves as an input the RBO line typically serves as an output but it can also be configured as an input G3 by connecting it to an external drive source When G3 is held low by an external source it overrides all other inputs to the display driver and causes the display driver to provide blanking outputs to all segments of
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8. 176 D TO 047 SHEET 12 1 TO 055 Jn 2 d edi d Figure 8 15 Operating Program Flow Chart 118 of 14 JUL VICU 12a 8 46 an FROM POSITIVE LINEAR CONVERSION SUBROUTINE SHEET 8 NEGATIVE LINEAR CONVERSION SUBROUTINE 5 9 106 CONVERSION SUBROUTINE SHEET 10 OVER RANGE SUBROUTINE 147 PE FRI AUTO RANGING ENABLED NO YES LIGHT LIGHT QVER RANGE LED RANGE LEB RANGE YES 2 3 OR 4 NO COUNT RANGE COUNTER UP 1 5 1085 1 COUNT RANGE COUNTER UP 1 TO OVER UNDER RANGE CONTINUE 17 SUBROUTINE GVER UNDER RANGE SHEET 12 TO DELAY TO AUTO ZERO CONTINUE SUBROUTINE 047 SUBROUTINE SHEET 13 SUBROUTINE SHEET 5 gt CLEAR MAIN COUNTER AND SET SIGN FLIP FLOP 38 REF SWITCH PRESSED LGAD CONTENTS OF MAIN COUNTER INTO REFERENCE REGISTER TO DISPLAY ANB REMOTE TALK SUBROUTINE SHEET 14 Figure 8 15 Operating Program Flow Chart 12A of 14 Model 436A Model 436A OVER RANGE SUBROUTINE FROM q 075 SHEET 8 134 SHEE
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10. om 1 D 0 lt gt 15 RENTE Loo 113 120 TO 056 SHEET 6 MI C ROTE PL ERR Figure 8 15 Operating Program Flow Chart 138 of 14 8 49 Service 14a FROM LINEAR POSITIVE CONVERSION SUBROUTINE SHEET 8 LINEAR NEGATIVE CONVERSION SUBROUTINE SHEET 9 RELATIVE dB SUBROUTINE SHEET 11 OVER UNDER RANGE CONTINUE SUBROUTINE SHEET 12 f Model 436A DISPLAY AND REMOTE TALK SUBROUTINE _____ ___ a ___ __ esed EI DISPLAY COUNT AND SIGN AUTO ZERO A D CONVERTER 1 COUNT REMOTE TALK READY FOR DATA BUS CONNECTED SET DATA VALID LINE BATA ACCEPTED RESET DATA VALID LINE REMOTE SELECTED AUTO ZERO A D CONVERTER 1 COUNT B A TO LOCAL TO LOCAL REMOTE INITIALIZE SUBROUTINE BRANCH SUBROUTINE SHEET 6 SHEET 4 Figure 8 15 Operating Program Flow Chart 14A of 14 486 Service DISPLAY AND REMOTE TALK SUBRGUTINE FROM E 072 074 SHEET 81 131 133 SHEET 9 170
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12. B Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 2500 Description Power Meter programmed to dB Rel mode range 1 trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked C Check that 1 Mode select logic outputs dB REF mode and resets NAUTO output 2 Range select logic outputs range 1 3 Range counter is preset to range 1 and output of mode select logic is loaded into mode register during Remote Initialize Subroutine 16 Error Power Meter range or mode output character checked Manually program Power Meter to dB REL mode range 2 trigger with settling time CMD U B2T Description Power Meter programmed to dB REL mode range 2 trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 C Check that 1 Mode select logic outputs dB REL mode 2 Range select logic outputs range 2 3 Range counter is preset to range 2 during Remote Initialize Subroutine 17 Error Power Meter range or mode output character wrong Manually program Power Meter to dB REL mode range 3 trigger with settling time CMD U Description
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24. a 9 99 dBm indication verifies the following address branches 163 165 dB Rel Subroutine After verifying indications readjust CAL ADJ control to obtain 10 00 dBm indication 9 97 dBm indication verifies the following address branches 164 166 167 branch to dB Rel Subroutine from address 166 OVER RANGE indication verifies the branch from address 167 to the Over Range subroutine 8 64 Cv LE Model 436A out changes to 0 00 Service Table 8 3 Standard Instrument Checkout 14 of 17 Instrument Setup and Test Procedure Test Description and Key Operating Sequence Set Range Calibrator RANGE switch to 5 dBm then press Power Meter dB REF MODE switch and hold for two seconds Verify that dBm lamp goes out dB REL lamp lights and indication on Digital Read Set Power Meter RANGE HOLD switch to off out and Range Calibrator RANGE switch in turn to 10 and 5 dBm Verify that Digital Readout indication changes to 5 00 0 02 and 10 00 0 02 dBm re spectively Then set Range Calibrator RANGE switch to 5 dBm and adjust CAL ADJ control as required to obtain 1 00 dBm indication on Digital Readout After veri fying 1 00 dBm indication readjust CAL ADJ control for 0 00 indication DESCRIPTION This step verifies the capability of the Power Meter to store a dB reference level and to indicate input power levels with respect to the stored
25. C Ot Table 8 4 HP IB Circuit Troubleshooting 16 of 18 3 The following display is observed with the logic analyzer connected normally refer to troubleshooting example Prohlem and Description Corrective Action 36 1 The following display is obtained with the logic analyzer cont connected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 0128 Remote Initialize Subroutine address 10 001 010 1 11 000 010 00 001 011 2 01 000 100 00 001 101 3 01 000 100 01 000 001 4 01 000 100 2 The watt mode output of the mode select logic is loaded into the mode register during the Remote Initialize Subroutine 37 programming command is sent to the Power 1 Meter and calculator checks 1 0 status and setup Sweep TRIGGER VOS 28 Error Power Meter takes trigger immediate GO TO line 1530 and use STEP key to manually execute program measurement when programmed to trigger line by line Check that the following indications are obtained with settling time 1530 Description Power Meter is first pro 1 L HOLD output of measurement rate select logic is set grammed to watt mode range 2 trigger false by trigger immediate programming command immediate then a talk cycle is enabled to 2 Operating program branches from Local Remote Branch after a 200 ms delay Since the Power Meter cause the Power Meter to enter the Remote Subroutine Hold Loop to Remote Initia
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28. DESCRIPTION This step verifies the slope of the Log Conversion Ramp for a 91 input power level and the branching between various addresses in the Log Conversion Subroutine KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below A D Converter Input Ramp Amplitude Addresses Verified Voltage DC Test RMP Test Point Log Conversion Point A3TP4 2 Subroutine 1 005 0 002 1 136 0 014 Vp p 155 156 detect 10 02 dBm YPLS 0 1 007 0 002 7 150 0 014 Vp p 157 160 gt and branch 10 03 dBm to dB Rel 1 012 0 002 7 185 0 014 Vp p 161 162 Subroutine 10 05 dBm gt 1 260V gt 8 946 Vp p 162 163 164 165 OVER RANGE NOTE If necessary adjust LFS potenti ometer A3R48 to obtain speci fied ramp amplitude 8 63 450 8 3 Standard Instrument Checkout 13 of 17 Test Description and Key Operating Sequence DESCRIPTION This step adjusts the slope of the Log Conversion Ramp instrument Setup and Test Procedure e Readjust CAL ADJ control to obtain 10 00 dBm indication on Digital Readout Then set WATT MODE switch to on and ad just CAL ADJ control as required to obtain 10 00 mW indication After obtaining this indication set dBm MODE switch to on and adjust LFS potentiometer A3R48 to obtain 10 00 dBm indication NOTE Power Meter is now fully c
29. ef el f NE et Data output C dB Ref Dn E ao selected by NMI and D inputs to Line Selectors ds H ROM address SP plus 23g Data output se selected by ROM ROM address 03g minus Data output se lected by ROM H E E ROM address 24g 8 155 Model 436A Tahle 8 10 Power Meter Talk HP IB Output Data Format 2 of 3 hu wel EM LLL opp fe fs panou se lected by YK1 s E inputs to L H 1 ROM address 05g or 25g 2 Data output se lected byYH1 inputs to Line Selectors ROM address 026g Data output se lected by YD1 YD4 inputs to Line Selectors ROM address 078 or 278 Data output se lected by YU1 YUA inputs to Line Selectors ROM address 10g or 30g HI Data output se lected by ROM L 1 ROM address 118 318 Data output se L lected by ROM 1 ROM address 12g Data output se lected L 1 ROM address 32g Data output se lected by ROM ___ E ro ES mM __ EM _ pen EE 8 156 436 Service Table 8 10 Power Meter Talk Output Data Format
30. 199135 10187 G318VN3 210W3U 31638 i i SILVIS JONVU DE 39NVH i D E 2 4 39ONVU 3 H1 3GOW 901 135399 NOIS 39NVU 3041 FONVY 3081 SLLVM 031 pm or A eR 2 2118 300W 4 t CEELEN i AS 47 HZVN 318VN3 OYFZ OLNY HOSNIS us 0437 gs 1 V 17 03123 135 300W DE 123135 ANIOd 1VWI23Q wer xy as iquiassy LYLY Apquiassy 11034 EY 0 4 VI ITU ED SERVICE SHEET 4 BLOCK DIAGRAM CIRCUIT DESCRIPTIONS The Block Diagram Circuit Descriptions for Service Sheet 4 are covered paragraphs 8 115 through 8 154 HP IB Instrument Checkout in paragraphs 8 63 through 8 66 HP IB Verification Programs in Figures 8 16 and 8 17 and Troubleshooting in Table 8 4 8 164 AIRA AN 5823308 0432 0187 IWA UT M NEMO ea MONS LC 1 d 123135 IGON 750912117710 3000 ae O JURE eee UZN 3ONVE Cdp HELL 7 159135 3 NVH 310W3H WP pae oe
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32. KEY OPERATING SEQUENCE Program execution and cireuit operation previously verified except as indicated below a Power Meter remains configured in WATT MODE refer to Service Sheet 3 Mode Selection b Voltage at DC test point is adjustable to 0 010V Set Range Calibrator FUNCTION switch to CALIBRATE and RANGE switch to 100 uW Observe indication on Digital Readout and adjust Power Meter CAL ADJ control to ob tain 100 0 uW indication Then press and hold SENSOR ZERO switch and adjust BAL potentiometer A3R65 as required to obtain 60 0 0 2 uW indication while ZERO lamp is lit DESCRIPTION This step adjusts BAL potentiometer A3R65 to center the sensor zero circuit output voltage range Service Sheet 8 KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below a Voltage at DC test point ASTP4 is adjustable to 1 000 0 002V when SENSOR ZERO switch is not pressed Voltage at DC test point is adjustable to 0 600 0 002V with BAL potentiometer A3R65 when SENSOR ZERO switch is pressed Set Range Calibrator FUNCTION switch to STANDBY then press and release Power Meter SENSOR ZERO switch Verify that Digital Readout indication changes back to 00 0 with blinking sign while ZERO lamp is and remains at 00 0 00 2 when ZERO lamp goes out DESCRIPTION This step rezeros the Power S
33. 430A Addresses Verified Log Conversion Subroutine 135 136 detect YPLS 0 137 150 and branch to dB Rel 151 152 Sub routine Model 436A Service Table 8 3 Standard Instrument Checkout 12 of 17 Instrument Setup and Test Procedure Test Description and Key Operating Sequence Set Power Meter CAL FACTOR switch to 100 and Range Calibrator RANGE switch to 5 dBm Adjust CAL ADJ control to obtain 5 06 dBm indication then readjust CAL ADJ control to obtain 5 00 dBm indication DESCRIPTION This step verifies the slope of the Log Conversion Ramp for a 46 input power level and the branching between var ious addresses in the Log Conversion Subroutine KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below A D Converter Input Ramp Amplitude Addresses Verified Voltage DC Test RMP Test Point Log Conversion Point 4 2 Subroutine 0 320 0 003 2 272 0 014 153 154 detect 5 0 and branch to dB Rel Subroutine NOTE If necessary adjust LFS potentiometer 48 to obtain specified ramp amplitude Set Range Calibrator RANGE switch to 10 dBm and adjust CAL ADJ control to obtain the following indications 10 02 dBm b 10 03 dBm 10 05 dBm OVER RANGE blanked Digital Readout
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37. ia 436 TEST IS REPEATED ONCE BUS CMD Power Meter addressed to listen and programmed to trigger with settling time ASSIGNMENT increment test number T 4 5 GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range mode and data D 9 digits 370 IF THEN YES NO T 5 380 IF THEN REF mode Page 8 81 GO SUB print ERROR 3 stop Service 390 GOTO line 410 410 ASSIGNMENT test and error number set to 4 Figure 8 16 HP IB Verification Program HP 9830 Calculator 8 of 25 8 77 436 BUS CMD Power Meter addressed to listen and programmed to auto zero range 2 trigger with settling time GOSUB RETURN Power Meter unaddressed to listen and programmed to talk calculator set up to read status S range R mode M and data D 9 digits 440 IF THEN NO YES GO SUB print ERROR Z4 or 4 5 stop 450 GO line 470 470 1F THEN NO YES 480 ASSIGNMENT set error number to 4 5 490 GO TO line 420 500 REM remarks Figure 8 16 Verification Program HP 9830A Calculator 9 of 25 8 78 Model 436A Service 510 BUS CMD Power Meter addressed to listen and programmed to auto zero range 1 trigger with settling time
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39. Option vious program cycle Load mode select inputs into mode register to se Address 103 if Table 8 4 Errors Watts mode was 3 and 33 lect mode for current program cycle LCKM Auto zero A D conver ter for 1000 counts LAZ LCNT Clear main counter LCLR Auto zero A D converter for 1000 counts LAZ LCNT Clear main counter LCLR Local Initialize Count range counter down to range 5 if range 0 6 or 7 is selected LCRD Load mode select inputs into mode register 8 126 selected for pre vious program cycle Address 104 Measurement Sub routine Address 061 Auto Zero Sub routine Address 056 IB Option Table 8 4 Error 83 HP 1B Option Table 8 4 Error 83 HP IB Option 8 3 Step 1 range 5 branch Step 14 range 3 branch Step 19 range 1 branch Step 24 mode register loaded A D Converter Auto Zero Function A D Converter Auto Zero Function Range Selection Mode Selection 436 Table 8 6 Operating Program Description 4 of 11 Block Diagram Description Service Title EX _ Trouhleshooting Refer To Auto Zero Clear main counter LCLR Address 057 Table 8 3 Step 1 A D Converter Subroutine Auto Zero Function Measurement Sub routine Address 061 a Auto zero A D converter for 8000 Counts LAZ LCNT b Clear main counter
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45. LCLR Measurement Address 063 Subroutine a Load dc input voltage in to A D converter for 2000 counts LINP LCNT NOTE Ramp charges to 7 09 times dc input Table 8 3 Step 1 A D Converter Measurement Function b Clear main counter LCLR Check mode selected Mode Selection b Load outputs for true range decoder into sign detector and main coun ter if dBm dB REF or dB REL mode selected Address 065 for mode Table 8 3 Step 1 Address 066 for dBm dB REF or dB REL mode Table 8 3 Step 24 dBm mode Step 32 dB REF mode A D Converter Log Conversion Check whether A D ramp has ehanged to negative or positive input b Load outputs of true range decoder sign 0000 count into sign detector and main coun ter LPSC if de input was negative indicating negative power noise input c Enable A D ramp posi tive conversion slope LRMP is de input was positive Linear Negative Conversion Subroutine Address 016 for negative dc input Table 8 3 Step 10 2 3 A D Converter Linear Conversion Linear Positive Conversion Sub routine Address 071 for positive input Table 8 3 Step 1 Check whether dc input Under Range Sub Table 8 3 Step 24 2 3 A D Converter is und
46. POWER UP SUBROUTINE LOCAL REMOTE BRANCH SUBROUTINE 035 SHEET 4j 024 045 112 SHEET 14 REMOTE TO 052 SHEET 6 70 012 SHEET 5 1 ADDRESS 0000 WILL HELD UNTIL END OF LPU PULSE SEE SERVICE SHEET 10 Figure 8 15 Operating Program Flow Chart 4B of 14 5 FROM LOCAL REMOTE BRANCH SUBROUTINE SHEET 4 uae INITIALIZE SUBROUTINE me YES LOAD RANGE COUNTER COUNT RANGE 5 COUNTER DOWN RANGE 5 CLEAR MAIN COUNTER FAST FAST OR SLOW SLOW RANGE YES 4085 NO LOAD MODE SELECT NAT REGISTER RANGE dB 2083 LOAD MODE SELECT 4 REGISTER LOAD MODE SELECT REGISTER 9 RANGE LOAD MODE SELECT TORS REGISTER 1 RANGE 3 2083 AUTO ZEROAD LOAD MODE CONVERTER SELECT 2 1000 COUNTS REGISTER AUTO ZERO A D CONVERTER 1000 COUNTS CLEAR MAIN COUNTER TO MEASUREMENT TO DELAY TO AUTO ZERO SUBROUTINE SUBROUTINE SUBROUTINE SHEET 7 SHEET 13 SHEET 8 Figure 8 15 Operating Program Flow Chart of 14 8 30 Cue EE AMMA Model 436A REMOTE INITIALIZE SUBROUTINE ee
47. line 2080 2080 RESTORE data pointer to start of line 2090 Figure 8 16 Verification Program HP 9830A Calculator 22 of 25 8 91 Model 436A 2090 2100 READ DATA programming commands and compare data for status checks S1 status compare range programming commands M mode programming commands 2110 ASSIGNMENT error number incremented 42 44 2120 2130 BUS CMD OUTPUT send range and mode programming commands to Power Meter 2140 GO SUB RETURN trace subroutine change DISP RUNNING to PRINT for trace mode operation 2150 GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 2160 IF THEN NO YES 2180 GO SUB print ERROR Z X 42 44 stop GO TO line 2190 2190 IF THEN ves Figure 8 16 HP IB Verification Program HP 9830A Calculator 23 of 25 8 92 Model 436A Service BUS CMD Power Meter addressed to listen and programmed to WATT Mode range 3 CAL FACTOR switch enabled trigger with settling time 2210 ASSIGNMENT error number set to 45 2220 GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 2230 IF THEN 1 176 0 008 mW Received NO YE
48. tion Address 022 for remote operation Table 8 4 Error 3 Option N A for BCD Option Table 8 4 Error 1 HP IB Option N A for BCD Option Address 022 if re mote listener not ready for data Address 045 if re mote listener ready for data Local Remote Not Verified Branch Subroutine Address 045 if line set Address 046 if line reset Table 8 4 Error 1 Option Table 8 5 Step 2 BCD Option Troubleshooting Block Diagram Description Service 2 3 A D Converter Auto Zero Function Program Execution Talk Cycle Measurement Rate Programming Re mote Qualifier Program Interface and Talk Cycle Program Execution Measurement Rate Programming Com mand Processing Measurement Rate Programming Re mote Qualifier Program Interface and Talk Cycle Program Execution Remote Enable General Description Program Execution Talk Cycle Measurement Rate Programming Re mote Qualifier Program Interface and Talk Cycle Program Execution Talk Cycle Measurement Rate Programming Re mote Qualifier Program Interface and Talk Cycle 8 133 Dervice Model 436A Table 8 6 Operating Program Description 11 of 11 Block Diagram Description Service Trouhleshooting Refer to Sub Routine Address Function Branch To Display and 046 Set data valid line to enable Address 110 Table 8 4 Error 3 Program Execution
49. 036 Auto Zero A D Converter Address 006 Table 8 3 Amplifier Demodu 121 for 666 ms main counter 15 lator amp Filter Circuits 113 is cleared by LCLR instruc 116 tion auto zeroing is enabled A D Converter Auto 117 by LAZ and LCNT instruc Zero Function 115 tions Auto zero period is 8000 counts for each address NOTE This subroutine is associated with range 1 and 2 measure ments It essentially serves as program pause to allow the output of the variable low pass filter to settle Auto Zero Sub routine Address 056 for local operation Address 120 for remote operation 006 Check whether local or re mote operation is enabled REMOTE 37g Table 8 3 Step 1 Program Execution Remote Enable General Description 120 Check whether immediate or delayed measurement is enabled Auto zero sub routine Address 056 for immediate measurement Program Execution Measurement Rate Programming Command Processing Address 123 for delayed measure ment Measurement Rate Programming Re mote Qualifier Program Interface and Talk Cycle 128 Auto zero A D Converter 122 for 267 ms main counter is cleared by LCLR instruc tion auto zeroing is enabled by and LCNT instruc tions Auto zero period is 8000 counts for each address A D Converter Auto Zero Function
50. 520 530 ASSIGNMENT Test number incremented T 5 16 error number set to 5 540 GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range mode and data D 9 digits 550 IF THEN YES NO 2310 Subroutine print ERROR 5 stop 560 iF THEN Zeroed 1 count BUS CMD Power Meter addressed to listen and programmed for WATT Mode Unzero trigger with settling time 580 GO SUB RETURN Power Meter addressed to talk calculator set up to read status S range R mode M and data D 9 digits ASSIGNMENT Test number and error number set to 6 600 IF THEN NO YES GO SUB print ERROR 6 stop Figure 8 16 HP IB Verification Program HP 9830A Calculator 10 of 25 8 19 HCE 450A 610 GO TO line 630 WAIT 10 000 BUS CMD Power Meter addressed to listen and programmed to WATT Mode trigger with settling time ASSIGNMENT set error number to 7 GOSUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 680 IF THEN NO YES 2310 Subroutine print ERROR 7 stop 690 700 ASSIGNMENT 2 incremented 2 2 5 error number set to 8 8 80 710 IF THEN YES NO GO SUB print ERROR 8 stop Figure 8 16
51. 8 20 LIE PROGRAM QUALIFIER INPUTS YH2 6 9 Conversion YH1 YH2 10 12 YH8 Linear Negative Conversion YH1 YH2 2 3 4 Remote Initialize 6 9 Measurement should be 10 12 Linear Positive Conversion Linear Negative Conversion When low enables Power Meter to automatically select most accurate measurement range When high causes Power Meter to hold last range seleeted either locally or remotely Main counter hundreds output BCD Least significant digit of main counter thousands output BCD Most significant digit of main counter thousands output BCD 1 3 A079 436 Service Sheet 3 10 YM2 YRMT YRMT FAST Service Table 8 2 Program Mnemonic Descriptions 2 of 5 Subroutine Remote Initialize Measurement Relative dB Over Under Range Continue Measurement Linear Positive Conversion Linear Negative Conversion Log Conversion Power Up Remote Initialize Local Initialize Under Range YR2 YR3 only Over Range Display and Remote Talk Remote Initialize Delay Description Two bit code which selects measurement mode as follows YM2 YM1 Mode 1 dBm 0 dB Rel 1 Watts 0 dB Ref dB REF switch pressed A D converter output During measurement subroutine indicates whether A D input is above or below A D threshold YPLS high or low respectively
52. 8 93 Program and Remote Interface Circuit Initialization When power is turned on a Master Reset LPU is generated by the Power Up Detector to select local operation of the Power Meter refer to Service Sheets 4 and 5 and to initialize the operating program to power up address 000g If the Power Meter is subsequently configured for remote operation and a device clear input is received the remote interface circuits also generate a power up reset The power up reset output of the Remote Interface Circuits reinitializes the operating program to power up address 000g but it does not terminate remote operation Instead it presets the Remote Interface Circuits to select the following operating conditions WATT MODE Range 6 counted down to range 5 before measurement Autoranging enabled CAL FACTOR switch disabled 8 94 Program Execution The operating program consists of a group of 16 bit data words stored in the State Controller The words are designated by address with 000g being the lowest address and 877g being the highest address stated previously a power up reset signal LPU is generated by the Controller when power is turned on to initialize the program to starting address 000g From then on the program is self executing with branching between the words being controiled by the Power Meter operating conditions detected Thus the program is essentially a sequential logic circuit which interfaces with the Power Meter hard
53. C GAIN R1 R2 OUTPUT V4 INPUT IMPEDANCE R2 OUTPUT IMPEDANCE VERY LOW Vo IF A IS LARGE V 2 0 47 THEN V4 TET 3 IF V4 0 47 THEN Figure 8 3 Operational Amplifier Functional Circuits 3 3 Model 436A Digital Integrated Circuits and Symbols cont d that the signal which initiates the change returns to its opposite state f The inhibiting input indicator symbol 73 indicates that the output is prevented from going to its indicated state as long as the inhibiting input remains high If an inhibiting input indicator and a polarity indicator symbols are used together the output will be inhibited as long as the inhibiting input remains low The inhibiting input symbol is used mainly with three state logic devices to allow the use of the wired OR connection of the outputs NOTE The term binary coded decimal BCD refers to four bit binary circuits that range from decimal 0 to 9 in an 8421 code The term binary when applied to four bit binary circuits refers to circuits that range from decimal 0 to 15 in an 8421 code Table 8 1 Logic Levels and Power Requirements Low Power Requirements Gnd 5V Gnd Vpp 5 Vac 12V 8 33 Dual D Type Flip Flop The dual D type flip flop shown in Figure 8 4 consists of two Figure 8 4 Dual D Type Flip Flop Service independent D type flip flops The information
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55. FROM INITIALIZE SUBROUTINE ISHEET 5 AUTO ZERO SUBROUTINE SHEET 5 LOAD INPUT VOLTAGE INFO A D CONVERTER 2000 COUNTS CLEAR MAIN COUNTER dB MODE SELECTED YES NO WATTSI AD CONVERTER OUTPUT POSITIVE YES NG RESET SIGN LATCH SIGN TO LINEAR NEGATIVE CONVERSION SUBROUTINE SHEET 9 PRESET COUNTER A D CONVERTER OUTPUT POSITIVE YES ENABLE LOG CONVERSION RAMP TO LOG CONVERSION SUBROUTINE SHEET 10 aama LIGHT UNDER RANGE LED AND BLANK DISPLAY TO UNDER RANGE SUBROUTINE SHEET 11 Figure 8 15 Operating Program Flow Chart 7A of 14 Model 436A Ll Model 436A Service MEASUREMENT SUBROUTINE 104 SHEET 5 1 057 SHEET 6 061 95 1 22 22 LENT LINP LCNT 05 5 f 22 LCLR LINP LCNT Corse TO 076 SHEET 9 17 17 gt m as camem GEMMAM Un iu am UU n TG 871 TO 174 TO 136 8 SHEET 11 SHEET 10 maaan A Figure 8 15 Operating Program Flow Chart 78 of 14 8 35 Model 4504 FROM MEASUREMENT SUBROUTI
56. THIS 4 PAGE 8 2 O nar ain SCHEMATIC DIAGRAM NOTES Resistance in ohms capacitance in picofarads inductance in millihenries unless other wise noted Asterisk denotes a factory selected value Value shown is typical Part may be omitted Tool aided adjustment Manual control Encloses front panel designation Encloses rear panel designation Circuit assembly borderline Other assembly borderline Also used to indicate mechanical interconnection ganging Heavy line with arrows indicates path and direction of main signal Heavy dashed line with arrows indicates path and direction of main feedback Wiper moves toward CW with clockwise rotation of control as viewed from shaft or knob Numbered Test Point Lettered Test Point Measurement aid No measurement aid provided provided Encloses wire color code Code used is the same as the resistor color code First num ber identifies the base color second number identifies the wider stripe third number identifies the narrower stripe E g 947 denotes white base yellow wide stripe violet narrow stripe direct conducting connection to the earth or a conducting connection to a structure that has a similar function e g the frame of an air sea or land vehicle conducting connection to a chassis or frame Common connections like designated points are connected Letter off page connection Number Service Sheet number
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58. Verification Program HP 9830A Calculator 11 of 25 RAL AAPA Model 436A GO TO line 640 BUS CMD Power Meter addressed to listen and programmed to trigger with settling time GOSUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 760 IF THEN N Zeroed f YES Page 8 83 770 GO TO line 410 J Page 8 83 e Page 8 77 REM remarks ASSIGNMENT set mode programming command M 64 ASSIGNMENT increment M 65 68 FOR NEXT loop 6 times NEXT on line 940 READ DATA programming commands and compare data for range and mode checks R range programming commands 81 range status com pare data D1 measured value compare data BUS CMD OUTPUT Power Meter addressed to listen and programmed to range and mode specified on lines 820 and 800 respectively GO SUB RETURN trace subrouting change DISP RUNNING to PRINT for trace mode operation ASSIGNMENT increment error number 9 32 BUS CMD Power Meter addressed to talk ENTER calculator reads status 5 range R2 mode M1 and data D 9 digits Figure 8 16 Verification Program HP 9830 Calculator 12 of 25 Service 8 81 Service Model 436A T 900 1 980 IF THEN NO 930 IF THEN PRINT statement
59. for the MOS ROM storage capacity increases to 256 16 bit words 4096 bits 8 54 When the ROMs are initially programmed each 8 or 16 bit word is stored at a predeter mined address During subsequent operation selection of the desired word is accomplished by applying the appropriate address code to the X Y inputs In the Power Meter the gate G input on the TTL ROMs is not used it is tied to ground to keep the ROMs continuously enabled The speci fie program associated with each ROM is listed adjacent to the Service Sheet schematic on which the ROM is shown 8 18 WLOGEL 0 Truth Table Binary Outputs Data Control ers rur Display H HIGH L LOW X DON T CARE CONDITION The Gi input will blank the display only if a binaty zero is stored in the latches XXXX lt STABLE H STABLE HHHHHHH BLANK LLLLLLH ri HLLHHHH The output pin 4 when used as an input G3 overrides all other input conditions Figure 8 11 LED Display Driver 8 14 Service Model 436A service Truth Table L do b E LL HHH L iow X Don t care condition Figure 8 13 MOS and TTL ROMs 8 15 service 450A TROUBLESHOOTING 8 55 TROUBLESHOOTING 8 56 Since the Power Meter is a software con trolled instrument effective troubleshooting requires a thorough knowledge of both hardware operation and program execution As an aid to th
60. ASi ASI gt se gt ASE S H319103H 1091009 F ANHA i 3 1 1 je d CEC CHA St THA h vat v d n GSA j nz x01 0 4 5 111 01 SON 01 1 160009 96900 jquiass r 22398 0 4 1 058 81515 5 is e dd 8 931109209 31915 umm 70999 95500 Ajquiassy 18104009 CLA LLiS Ayquiassy 391043403 Div Sv ONDINYT8 A 5 ph ein SY a A S8 amp n A i ii 8101 DE BP EN SNOLLVNSIS3Q 39N3Hu3d3U YJAWNN Nid SNOLLJ3NNOJ ONY 1402810 O31VH931NI 2021 0081 1 1611 8081 8550 0281 0780 078 5611 0261 818 8410 0281 1191 0481 7611 0281 8250 0081 7900 0281 0 8 0200 6898 0180 5981 1894 SNOLLVN9IS3UG 329N3U343H H3AWNN 1994 119812 Q3iVH931NI YOLSISNVEL 8 ASSY 01 ASSY X133Ud ON SNOILVNBSIS10 HA 9098 ur sr Punepxaeg i ES Ajquiassy gy jo ued se payddns 0N 7 at
61. Auto Zero sub routine address 056 Table 8 4 Errors 4 and 4 5 HP IB Option Table 8 5 Step 3 BCD Option Display and 177 Remote Talk Transfer count and sign to front panel display and in form remote interface cir cuits that measurement completed LTC Address 022 Table 8 3 Stepi 2 Display Assembly True Range Decoder A D Converter Linear Conversion A D Converter Log Conversion 8 132 CH An 31 1 400A m Display and 022 Remote Talk cont d AMA Table 8 6 Operating Program Description 10 of 11 Auto zero A D converter for one count LAZ Check whether remote talk selected TALK 828 Check whether free run or triggered operation is selec ted HOLD 0365 Check whether local or re mote operation is selected REMOTE 0378 Check whether remote listener ready for data RFDQ 349 Check whether data accepted line set DACQ 31g Refer To Address 023 Table 8 3 Step 2 Address 024 if re mote talk not selected Address 044 if re mote talk selected Table 8 3 Step 2 Local Remote Branch Subroutine Address 026 for free run or if trigger is received to initiate new program cycle Address 025 if trig ger is not recieved Table 8 3 Step 2 Table 8 4 Errors 4 and 4 5 HP IB Option for BCD Option Local Initialize Sub Not Verified routine Address 052 for local oper
62. Counter and are gated with the LCNT instruction by the Up Down Count Control Logic to provide up or down clock outputs to the Main Counter as indicated in Table 8 7 Note that up clocks are provided when the signs of the input and reference power levels are different and down clocks are provided when the signs are same Note also that if the Main Counter is counted down through 0000 the Borrow output of the Main Counter toggles the 8 148 CIRCUIT DESCRIPTIONS Service Sheet 3 cont d Sign Latch causing the sign outputs and thus the direction of counting to change As illustrated in the examples below this counting technique comprises an algebraic subtraction with the input power level representing the minuend and reference power level representing the subtrahend Input Power Level 5 00dB 5 00dB 45 00 dB Reference Level 3 00dB 7 0088 5 00 dB Result 2 00 dB 20048 10 00 dB Input Power Level 5 00dB 5 00dB 5 00dB Reference Level 3 00dB 7 00dB 5 00 dB Result 2 0098 42 00dB 10 00 dB d When the Relative Counter 0 qualifier changes state the Controller detects that the con version is completed and terminates the LREL and LCNT instructions At this point the outputs of the Main Counter and the Sign Latch indicate the input power level with respect to the stored refer ence e After terminating the LREL and LCNT instructions the Controll
63. INSTRUCTION REGISTER BISASLES NEXT CYCLE INITIATED AS LISTED FOR 1a AND 16 Figure 8 15 Operating Program Flow Chart 2 of 14 8 26 AA 1 1 ADA Model 436 0 2 T3 NEXT ADDRESS SELECT BITS QUALIFIER SELECT CODES gt lt 14 9 0 9 0 6 9 9 0 1 1 1 1 1 1 1 1 Y 0 0 0 1 1 1 1 0 9 9 9 1 1 1 1 a C 0 e CB 65 69 Ow Om Ow Ow C YRMT IS A MULTIPLEXED QUALIFIER LINE INSTRUCTION CODE SELECTS OUTPUT OF MULTIPLEXER XX YRMT SELECT CODE INSTRUCTION OR YRMT SELECT MNEMONIC Service 3 FLOW CHART ARRANGEMENT CONTENTS STATE REGISTER IN Ti XX QUALIFIER SELECT CODE QUALIFIER MNEMONIC INSTRUCTION 08 XX INSTRUCTION OR YRMT SELECT CODE INSTRUCTION YRM SELECT MNEMONIC NOTES DECISION BLOCK LEFT BLANK WHEN ROM IS PROGRAMMED TO PROVIDE SAME OUTPUT FOR EITHER 1 OR 8 QUALIFIER STATE T4 1 NEXT ADDRESS SELECT BITS WHEN A YRMT SELECT CODE IS GENERATED AT T1 INSTRUCTION REGISTER 15 DISABEED AND STATE OF YRMT LINE AT 12 DETERMINES NEXT ADDRESS AT 74 1 INSTRUCTION CODES lt 6 YH8 YPLS NRZGO YRI YR3 NAUTO YM1 YRMT 18 28 48 58 68 78 108 118 128 138 14g 15g 16
64. Power Meter programmed to dB REL mode range 3 trigger with settling time Then Power Meter addressed to talk and range and mode output charac ters checked Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 C Check that 1 Mode select logic outputs dB REL mode 2 Range select logic outputs range 3 3 Range counter is preset to range 3 during Remote Initialize Subroutine Error Power Meter range or mode output character wrong Manually program Power Meter to dB REL mode range 4 trigger with settling time CMD U B4T Description Power Meter programmed to dB REL mode range 4 trigger with settling time Then Power Meter addressed to talk and range and mode output charac ters checked Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 C Check that 1 Mode select logic output dB REL mode 2 Range select logic output range 4 3 Range counter is preset to range 4 and output of mode select logic is loaded into mode register during Remote Initialize Subroutine 8 107 436A Table 8 4 Circuit Troubleshooting 10 of 18 Problem and Description Corrective Action Error Power Meter range or mode output character wrong Description Power Meter programmed to dB REL mode range 5 trigg
65. SALVAS JONVH EJONTYEJAO FONVE OLNY 584 915 OH3Z O10 YOSNIS 540193135 5238 NELLE 12 JONVY INL Se ZWAI A4N3NOd 2 10 X3H G i i E 2 m 123135 ZUNA 20 2 39NVU i WN es a Mu md B EGA amp 32012 12313 OS ce 318VN3 OLNY i PHA 5 2119 32012 FGOW 31901 Sze 93 91 1 V 5 uS 301993 7 ENALNO H31NDOO v2 ba 3 2012 318V5IG 378VNJ3 0822047 2013 220 Ajquiassy 0 1 sng LY 0 9 MAATA TA Model 436A SERVICE SHEET 5 HAS BEEN DELETED 8 167 IW VAI Model 436A SERVICE SHEET 6 CIRCUIT DESCRIPTIONS The circuits described in Service Sheet 6 are covered on Service Sheets 1 and 2 and Trouble shooting in paragraphs 8 55 through 8 62 8 168 Sarvina 5002207 Ajquiassy 2 17 2 8 P 0832 434 805836 500002904 3 Ajquiassy Aejdsig 797 9 amiy A18W3SSV 19 H3HDIH lX3N 30 LH Vd SI 5 LINDHIO 301 12810 Al18W3SSV LV O d 9 IPPON gt mE Model 436A Sensitivity Detecto
66. Trigger immediate 1 L Free run at maximum H rate R Free run with settling H time V X re pA gt NS gt gt eo Et m EB LOGIC CIRCUIT OUTPUT LRUN and LSLOW high LRUN set low by programming command reset by LTC instruction generated as start of display and re mote talk subroutine LSLOW low LRUN set low by programming command reset by LTC instruction generated at start of display and re mote talk subroutine p LRUN low LSLOW high LRUN low LSLOW low NOTE X Indicates Don t Care CIRCUIT DESCRIPTIONS Data Mode Operation 8 140 Sensor Auto Zero Programming Command Processing The Auto Zero Clock output of the Function Decoder sets a flip flop in the Auto Zero Enable Logic The output of the flip flop is then gated with the HREM input to select Sensor Auto Zeroing when remote operation is enabled refer to Service Sheet 3 Block Diagram Descrip Mode Selection and to allow front panel WIRED OR control of this function when local operation is enabled Resetting of the flip flop occurs when the Function Decoder provides Mode Clock output refer to previous description or when the Controller or the Device Clear De coder generates an LPU output 8 141 Factor Programming Command Pro cessing The Auto Zero Clock output of the Func tion Decode
67. line 2030 Measurement is triggered and front panel digital readout indication changes to 1 00 mW 2040 2390 Power Meter outputs correct data characters Power Meter data output can be verified per Read Byte Sub routine starting at line 5000 8 115 Model 436 8 4 Circuit Troubleshooting 18 of 18 Problem and Description Corrective Action 42 Error Power Meter does not provide under range watt mode status output Manually program Power Meter CMD U Check Power Meter status output per Read Byte Subroutine starting at line 5000 Description The Power Meter is pro grammed to range 5 watt mode and a measurement is triggered Then a talk cycle is enabled and the calculator checks the Power Meter status output Since 1 mW RF level is applied to the Power Sensor the status output should indicate under range watt mode NOTE Power Meter status output is generated by buffer ing and outputs of over under range decoder and output of mode select logic For a description of circuit operation for this test re fer to Service Sheet 3 Block Diagram Description Mode Selection and Linear Under Range Registration Error Power Meter does not provide under range log mode status output Manually program Power Meter CMD 0 DSR Check Power Meter statu
68. the HPLS 2 clock to reset the LRP or LRM output of the A D Control Register and gates and thereby terminating the conversion b LCNT instruction is also terminated to freeze the number in the Main Counter 8 140 436 Service CIRCUIT DESCRIPTIONS Service Sheet 3 cont d c An LCOR instruction is generated to reset the outputs of the Over Under Range Decoder d the measurement was taken on ranges 5 or on ranges one through four with Auto Ranging disabled an LSOR instruction is generated to enable the OR LED HOR and LBLANK outputs of the Over Under Range Decoder The OR LED output lights the front panel OVER RANGE indicator the LBLANK output blanks the front panel numeric display and the HOR output is gated with the HUR output by the Remote Inter face Circuits to provide one of four status outputs to the Remote Interface Controller After the LSOR instruction is generated an LTC instruction is generated to transfer the output of the Sign Latch to the front panel Sign Display Indicator via the Display Sign Latch to load the output of the Main Counter into the Display Registers and to indicate to the Remote Interface Circuits that the measurement is completed Since the LBLANK output is active at this time only the most signi ficant digit of the Main Counter output is dis played on the front panel e If the measurement was taken on ranges one through four with Auto Ranging enabled an
69. to 10 mW and verify that Digital Readout indication returns to level observed step 39 DESCRIPTION This step verifies the capability of the Power Meter to reset a negative power level OVER RANGE condition when an in range negative power level is applied KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for LCOR instruction asso ciated with address 131 or 133 refer to step 39 Rotate Power Meter CAL AD4 control as required to change Digital Readout indication from under 10 00 to over 10 00 or vice versa DESCRIPTION This step verifies the last remaining address branch of the Linear Negative Conversion Subroutine KEY OPERATING SEQUENCE Refer to step 39 Set Range Calibrator POLARITY switeh to NORMAL and readjust Power Meter CAL ADJ control to ob tain 10 00 mW indication Then verify Power Meter operation per Perform ance Tests of Section IV If any indi cation is abnormal adjust Power Meter as specified in Section V If indication is still abnormal after per forming adjustment procedure refer to Table 8 6 for list of unverified in struetions and to analog circuit troubleshooting information pro vided on Service Sheets 7 and 8 Model 436A Service TROUBLESHOOTING 8 64 HP IB Instrument Checkout 8 65 Test programs for verifying the operation of an HP IB equipped Power Meter are provided in Figures 8 16 and
70. 1200 READ DATA address data to verify that Power Meter will not respond to unassigned listen addresses 1210 OUTPUT command mode set 256 line 1200 address data sent V data mode set 512 1220 GO SUB RETURN trace subroutine change DISP RUNNING to PRINT for trace mode operation 1230 NEXT YES 1240 1250 BUS CMD Power Meter addressed to listen and programmed to trigger immediate talk 1260 ENTER calculator reads status S range mode M and data D 9 digits 1270 IF THEN YES GO SUB print ERROR 34 stop 1280 GO TO line 1300 N Figure 8 16 HP IB Verification Program HP 9830 Calculator 16 of 25 8 85 TUVI GO SUB RETURN device clear sent to Power Meter ASSIGNMENT error number set to 35 WAIT 200 millisecond delay BUS CMD Power Meter addressed to listen and programmed to dBm mode range 3 trigger immediate GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 1350 IF THEN NO 957 1360 IF THEN YES 1370 IF YES 1390 GO SUB print ERROR 35 stop 1380 GO TO line 1400 Figure 8 16 Verification Program HP 9830A Calculator 17 of 25 8 86 Rarvina Model 436A Service REM remarks ASSIGNMENT e
71. 173 SHEET 11 047 080 SHEET 12 177 37 37 REMOTE REMOTE TO 052 SHEET 6 33 33 MORE DATA DATA TO 026 SHEET 4 Figure 8 15 Operating Program Flow Chart 14B of 14 8 51 Service Model 436A Table 8 3 Standard Instrument Checkout 1 of 17 Instrument Setup and Test Procedure Test Description and Key Operating Sequence Connect Range Calibrator to Power Meter and NOTE set equipment controls as follows If the Power Meter is equipped with either remote interface option 002 or 024 remove both the A6 and A7 Assemblies before performing the standard checkout procedure Range Calibrator FUNCTION CALIBRATE POLARITY NORMAL RANGE 30mW LINE ON DESCRIPTION This step verifies that the power supplies are ating properly that the Power Meter powers up normally and that the Power Meter is capable of displaying a WATT MODE range 5 30 input power level Power Meter CALFACTOR 5 100 POWER REF Off out MODE WATT RANGE HOLD ON fin LINE ON When power is first applied verify that digi tal readout is blanked Then wait two sec onds for display to stabilize and verify that NOTE If Power Supply outputs are not within specifications the ROMs used in the in
72. 941 PU 541 299 em 990935 aan 9 Unt suyo eguewisay i 4 Stu 7 310N D l 5E M t 3 460 4 icd 2 FISD DB i X99 H3 EDU 565 4808 ido 10 83 10122120 3SVHd 4 HO VPN LV LUE AE is 42009 95200 ASY Hr A GENRE TRIN UE 393983 0 4 0 4 SLY 0 4 ANTATAG Service a Model 436 SERVICE SHEET9 ib CIRCUIT DESCRIPTIONS The circuits described in Service Sheet 9 are covered on Service Sheets l and 3 and Trouble shooting in paragraphs 8 55 through 8 62 8 174 436 ASSEMBLY R A3 ASSEMBLY MTR DC OFF ZERO OFF Figure 8 32 A3 A D Converter Assembly Components Test Point and Adjustment Locations AMAN DDE AAT 270 NARA WOLEZ SINAY 498009 b a SE ORRA YANO 0 1 OSa a Ed 1 CoRR 11481 0532 01 1 dA p 0 sag 82481939
73. ASSEMBLY Figure 8 34 A4 Counter Relative Assembly Component and Test Point Locations TERR arms arcto v PD ORO AUTOREN TID EOS M ve MEOR tme imer ata 306 SE ANB H 330131 9 25104 m NOULLISNYHI 01 6033 20 dd m 843 3g RC ite vile d ic oo 9 de CER ems 22 cm UN 8 4 8 3 901923130 9932 f he j tgs pe om e 33 23 dpi TAHNA di AN 91 y AGH 9 OL 3477 d ve 60009 92500 Arquisssy prog OLY 8 4 8118 pquiassy aanejpy Ge g 810614 jo Lu V S 40 Ayquiassy sepnjur uoneuibsep 4189868 5009 HA uonoas uoneuuogur Bunepyseg 996 i a S JA G t A
74. Address 146 if auto Table 8 3 Step 9 ranging is enabled 145 Count range counter up one Auto Zero Sub Table 8 3 Step 9 146 range if measurement was routine Address range 4 taken on range 2 3 4 056 if measurementjStep 22 range 2 was taken on range 0 2 3 or 4 Address 143 if Table 8 3 Step 21 measurement was taken on range 0 1075 A D Converter Log Over Range Conversion Range Selection 143 Count range counter up one Delay Subroutine Table 8 3 Step 21 range if measurement was Address 036 if taken on range 1 measurement was taken on range 1 Over Under Range Table 8 3 Step 36 Continue Sub routine Address 047 if measuremen was taken on range 5 Over Under 1047 Clear main counter LCLR Display and Remote Table 8 3 Step 6 dB Relative Range if dB REF or dB REL Talk Subroutine Conversion Continue mode selected Address 177 if Watt or dBm Mode Selected Table 8 3 Step 36 Address 040 if dB REF or dB REL mode selected 050 Load contents of main coun Display and Remote Table 8 3 Step 36 ter into reference register Talk Subroutine REL mode LLRE if dB REF mode Address 177 Step 37 dB REF selected mode 8 131 400A Table 8 6 Operating Program Description 9 of 11 Troubleshooti Block Block Diagram Description Description Sub Routine Address Function Branch To Refer Title Sheet
75. Comparator changes state anywhere between these two points in time the Controller detects an in range conversion c When the Controller detects that the conversion is completed it terminates the LRP or LRM input and updates the front panel status and Digital Readout indications as described in Service Sheet 3 8 83 A D Converter Log Conversion A log con version function is selected to discharge C3 when the Power Meter is configured for dB operation This function is similar to a linear conversion except as noted below LRL input is activated to discharge C3 at an exponential rate so that the output of the counter indicates the RF input power level in dB b The LLGR input is activated to change the Comparator s threshold input to 0 71V so that an under range condition is detected if charges to less than this value during the measurement function negative linear conversion mentioned above serves to indicate high noise levels at the input to the Power Sensor Any true input power level will cause positive input to be applied to the A D Converter An over range conversion is detected if the A D qualifier does not change state before 1100 counts gt 1 26 Vde input d The Controller may cause the Instruction Decoder to execute a dB relative conversion before updating the front panel Digital Readout indica tion During the dB relative conversion the output of the counter is changed to
76. Converter input voltage rise time at ASTP4 Measurement Subroutine 1st cycle after new input level A D Converter input voltage at DC test point de creases to less than 0 100V range 4 selected Under Range Subroutine Count range counter down one range to range 3 Local initialize Subroutine Branch to Auto Zero Subroutine Auto Zero Subroutine A D Converter input voltage at DC test point ASTP4 stabilizes at 0 316 0 002V by end of Auto Zero Sub routine delay of 8000 clock pulses 133 ms after start address 056 15 Set Range Calibrator RANGE switch to DESCRIPTION This step verifies that the Power Meter will 30 uW and verify that Power Meter auto auto range from range 3 to range 2 when the input power level ranges to range 2 according to the follow is changed from a range 3 3075 level to a range 2 3076 level ing sequence io KEY OPERATING SEQUENCE Program execution and circuit Digital Readout blanks _ momen operation previously verified except as indicated below tarily and UNDER RANGE lamp lights 4 momentarily Measurement Suhroutine 1st cycle after new input level A D Converter input voltage at DC test point de b mW lamp goes out uW lamp lights and creases to less than 0 100V range 3 selected decimal point moves two places to right while Digital Readout is blanked Under Range Subroutine Light UNDER RANGE indica
77. IB Verification Program HP 9830A Calculator 1 of 25 8 70 Service Model 436A s f S DTE dui CUP e Ci REF LY M EXE CY 34 18 Figure 8 16 HP IB Verification Program HP 9830 Calculator 2 of 25 8 71 service 8 72 n BE Sy onmi e a 4 CHE Figure 8 16 HP IB Verification Program HP 9830A Calculator 3 of 25 Model 4364 Service Model 436A 4 4 Figure 8 16 Verification Program HP 9830A Calculator 4 of 25 8 73 Service 400A an npe PE BAS DEN nami E m Tra Figure 8 16 HP IB Verification Program HP 9830A Calculator 5 of 25 8 74 4364 10 20 30 40 50 60 70 80 90 100 105 107 110 120 160 170 180 190 220 START REM remarks ASSIGNMENT initialize variables to 1 T test number E error number Z attempts to zero FORMAT specifications GO SUB RETURN output device clear then trace subroutine change DISP RUNNING to PRINT for trace mode operation BUS CMD OUTPUT HP Interface Bus set to local GO 508 RETURN output device clear then trace subroutine change DISP RUNNING to PRINT for trace mode operation BUS C
78. Initialize Sub routine address 10 001 010 10 001 110 10 001 013 00 101 110 00 001 100 00 101 111 10 001 101 00 101 111 Turn power and off to Power Meter Then manually program Power Meter to Watt Mode range 5 trigger with settling time CMD U 5 Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs Watt Mode 2 Range select logic outputs range 5 3 Range counter is preset to range 5 during Remote Initialize Subroutine Turn power on and off to Power Meter Then manually program Power Meter to Watt Mode auto range trigger with settling time CMD 20 Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs Watt Mode 2 Range select logie sets NAUTO output true 3 Operating program branches from Remote Initialize Subroutine to Auto Zero Subroutine Address 012 Q 1 not previously verified 4 Range counter is counted down to range 1 during Power Meter operating program cycle 436 Service Table 8 4 HP IB Circuit Troubleshooting 9 of 18 Problem and Description Corrective Action Error Power Meter range or mode output Manually program Power Meter to dB REL mode character wrong range 1 trigger with settling time CMD U
79. LTC instruction is not generated after the LSOR instruction Instead an LCRU instruction is generated to count the Range Counter up one range then another measurement is taken This cycle is repeated until either an in range measure ment is obtained or the Range Counter is counted up to range five 8 107 A D Converter Log Conversion A log conversion is enabled following the measurement funetion when the Power Meter is configured for dBm dB REF or dB REL Mode operation The Controller and Main Counter operating cycle associated with this conversion is described in the following paragraphs NOTE An LCLR instruction is generated follow ing the measurement function to set the output of the Main Counter to 0000 and to store a positive sign in the Sign Latch a The Controller generates LPSC instruc to load the True Range Counter and Sign Preset outputs of the True Range Decoder into the Main Counter and Sign Latch respectively As stated on Service Sheet 2 these inputs correspond to the minimum threshold of the range selected The threshold can be either a positive or negative number 1000 2000 etc and for any given range it is determined by the overall sensitivity of the Power Sensor in use b The Controller checks the state of the A D qualifier input to determine whether the dc input has caused the A D ramp to exceed the value of the log threshold When the YLOG input to the A D Control Gat
80. Ms 401237135 3817 a v 80123135 2109819 1 HOLSISNYHL IA m P van ES ASSY 8Y e 4 880 2 1 31V9 104100 Er dA S 5 it Edi LM LLCS 0107 z LM t 4 ON LL News 31v9 1141110 mmm ad D gt SNOILVN8IS3U 32N3H333H 808389 punoj Sna LLG aa Bugepxoeg L3 MSH 1 i ut 087 UI 9208151593 310N LLG aa Si 1812 el gt ir i Li Model 436A Service SERVICE SHEET 13 HAS BEEN DELETED 8 183 8 184 436 14 General The 1 assembly provides 50 5 MHz output at 1 mW 5 0 7 The oscillator s output is held constant by an ALC loop made up of a peak detector CR2 and comparator U2 The com parator reference input is from a very stable 5V power supply composed of Ui VR2 and their associated components The LEVEL control sets the comparator reference which controls the oscillator feedback level and thereby controls the 8 1 assembly POWER REF OUTPUT level The oscillator s frequency is set by
81. Program Flow Chart 9A of 14 Model 450 DISABLE RAMP DISABLE RAMP DISABLE RAMP EXTINGUISH OVER EXTINGUISH OVER EXTINGUISH OVER UNDER RANGE LEDS UNDER RANGE LEDS UNDER RANGE LEDS ee Sac ei ease erent TO Mq TO UNDER RANGE TO DISPLAY AND TO OVER RANGE SUBROUTINE REMOTE TALK SUBROUTINE SHEET 11 SUBROUTINE SHEET 12 SHEET 14 Model 436A Service LINEAR NEGATIVE CONVERSION SUBROUTINE Sm amr imma errr SMG CS A aaam rere IY ML m 7 SHEET 076 lt gt gt SHEET th SHEET 12 ISHEET TET EDU _ Figure 8 15 Operating Program Flow Chart 8B of 14 8 39 1 VIUU 400A 10 FROM MEASUREMENT SUBROUTINE SHEET 7 106 CONVERSION SUBROUTINE 136 ENABLE LOG CONVERSION RAMP ENABLE 106 CONVERSION RAMP CLOCK MAIN COUNTER ENABLE LOG CONVERSION RAMP 1180 NO COUNTS YES DISABLE RAMP DISABLE RAMP EXTINGUISH OVER EXTINGUISH OVER UNDER RANGE LEDS UNDER RANGE LEDS M tL m n tt gi nn TO RELATIVE dB TO OVER RANGE SUBR
82. Remote Initialize Sub 2 Measurement rate select logic stores programming command routine and the Power Meter should and provides low H HOLD and high H FAST outputs output MODE data character during 3 Mode select logic stores programming command and provides the Display and Remote dB REF mode output Subroutine 4 Operating program branches from Local Remote Branch Subroutine to Remote Initialize Subroutine 8 100 FLY ANAA Model 486A Service Table 8 4 HP IB Circuit Troubleshooting 3 of 18 Error Description Corrective Action 5 The following display is observed with logic analyzer con nected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 0128 Remote Initialize Subroutine Address 00 001 010 1 01 000 011 9 00 001 011 2 01 000 011 10 00 001 101 3 01 000 011 11 01 000 001 4 01 000 011 12 01 000 010 5 01 000 011 13 01 000 011 6 01 000 011 14 01 000 011 7 01 000 011 15 01 000 011 8 01 000 011 16 6 The output of the mode select logic is loaded into the mode register Service Sheet 3 during the Remote Initialize Subroutine 7 Operating program branches from Remote Initialize Sub routine to Measurement Subroutine then continues to cycle normally as previously verified Lines 210 250 and 260 previously verified d Line 340 first pass 1 Power Meter is addressed to listen and
83. Setup and Test Procedure Turn Power Meter CAL ADJ control slightly clockwise and counterclockwise and verify that indication on Digital Readout increases and decreases Set Range Calibrator RANGE switch to 100 mW and adjust CAL ADJ control to obtain 100 1 indication on Digital Readout Turn Power Meter CAL ADJ control to obtain 100 0 mW indication then set CAL FACTOR switch in turn to each position Verify that the indications given on the following page are obtained Test Description and Key Operating Sequence DESCRIPTION The previous step verified program execution up to the first address of the Display and Remote Talk Subroutine This step verifies that the Power Meter CAL ADJ control is opera tional and that the program branches from the Display and Remote Talk Subroutine to the Local Initialize Subroutine and then con tinues to cycle KEY OPERATING SEQUENCE Program execution and circuit operation verified in previous step except as indicated below Display and Remote Talk Subroutine Branch to Local Initialize Subroutine Measurement Subroutine NOTE Voltage at DC test point should vary as CAL ADJ control is rotated Ramp amplitude at RMP test point A3TP2 changes in pro portion to voltage change at DC test point 1 mV change at ASTP4 7 1 mV change in ramp amplitude DESCRIPTION This step verifies that th Power Meter is capable of properly displaying WATT MOD
84. State Devices Unless otherwise specified all symbols and signal mnemonics should be interpreted according to the following general rules a Signals that are active low are identified by the letter L or N followed by the signal mnemonic 2 b Signals that active high are identified by the letter H or Y followed by the signal mnemonic e g HLLD polarity indicator symbol gt at an input indicates that it is active low or triggers on a low going edge a polarity indicator symbol at an output indicates inversion or that the output is active low Active high inputs or inputs which trig ger on a high going edge and active high outputs are shown without the polarity indicator symbol d dynamic indicator symbol gt at an input indicates that the input triggers is active only on the leading or trailing edge of an input signal If a polarity indicator symbol is present with the dynamic indicator symbol then the input triggers on the negative edge of the input signal Inputs that are not edge sensitive are referred to as level sensitive and are shown without the dynamic indicator symbol e output delay indicator symbol 7 indicates that the output is effective at the time 8 7 8 8 450A OPERATIONAL AMPLIFIER B GAIN 1 R1 R2 OUTPUT OUTPUT INPUT IMPEDANCE VERY HIGH INPUT IMPEDANCE VERY HIGH OUTPUT IMPEDANCE VERY LOW OUTPUT IMPEDANCE VERY LOW
85. THEN PM outputs data YES GO SUB print ERROR 37 Stop 1590 GO TO line 1610 1610 ENTER calculator reads status S range mode and data D 9 digits 1620 ASSIGNMENT error number set to 38 1630 1640 BUS CMD Power Meter programmed to trigger immediate talk 1650 WAIT programmed delay of 200 milliseconds 1660 PM outputs data NO YES GO SUB print ERROR 38 stop 1670 GO TO line 1700 1700 REM remarks 1710 ASSIGNMENT test number set to 1 1720 BUS Power Meter addressed to listen and programmed to range 3 free run at maximum rate cal factor disable 100 1730 1740 PRINT text in quotes 1750 PRINT skip line 1760 ASSIGNMENT error number set to 39 Q Figure 8 16 HP IB Verification Program HP 9830 Calculator 19 of 25 8 88 Model 436A Service 1770 ASSIGNMENT test number incremented 1780 IF THEN YES NO 2310 Subroutine print ERROR 39 stop 1790 GOSUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status 5 range R mode M and data D 9 digits 1800 DISPLAY data 1810 IF THEN 799 mW Received YES 1820 1830 PRINT text in quotes 1840 PRINT skip line 1850 1860 ASSIGNMENT test number set to 1 error number set to 40 Figure 8 16 HP IB Veri
86. Thus when either of these addresses is present on the data lines the Address Decoder is enabled by data bits 1 5 and provides an Address Enabled output to the Listen and Talk Registers Discrimination between the addresses is accomplished by the Talk Decoder and the Listen Unlisten Decoder For talk address the Talk Decoder is enabled by data bits 6 and 7 and generates a Talk Clock output in response to the HCLK input For listen address the Listen Unlisten Decoder is enabled by data bits 6 and 7 and generates a Listen Clock output in response to the HCLK input The data bits 1 through 5 inputs to the Listen Unlisten Decoder enable it to pro duce an Unlisten output when the Remote Inter face Controller generates a Universal Unlisten Com mand 8 121 Since the Talk or Listen Clock is generated while the Address enable signal is active the associated register is clocked to the set state to enable the talk or listen function when the data bus is subsequently set to the data mode Resetting of the register to terminate the function occurs when the Power Meter is unaddressed to talk or listen or when the Remote Interface Controller activates the Interface Clear IFC line to clear the HP Interface Bus of all talkers and listeners 8 122 The Power Meter can also be configured as a talker by setting the TALK ONLY NORMAL switch to the TALK ONLY position When the switch is in this position the set input of the Tal
87. counted up or down during each cycle as required to obtain an in range measurement Resetting of the Auto Range flip flop occurs when the Function Decoder provides Range Clock output refer to previous description 8 148 Model 436A service Tahle 8 8 Function Decoder Clock Selection DATA BIT CODING PROGRAMMING COMMAND Sensor Auto Zero Enable Z Cal Factor Disable Cal Factor Enable NOTE X Indicates Don t Care PROGRAMMING COMMAND Measurement Rate R T V CLOCK SELECTED Range clock Mode Clock Auto Zero Clock Rate Clock 2 LOGIC CIRCUIT QUTPUT YRR1 high YRR2 and YRR8 low YRR2 high and YRR3 low r YRR1 and YRR2 high YRR3 low YRR3 high and YRR2 low YRR1 and YRR3 high YRR2 low Auto Range qualifier set true low by Auto Range Clock output of Function Decoder IYM1 1ow 2 high high IYM2 low IYM1 low low IYMI high high Auto Zero Enable NZR output set true low by Auto Zero Clock out put of Function Decoder Cal Factor Disable high UD Cal Factor Disable open collector I5 V 8 149 VILL Table 8 0 Programming Command Logic Operating Summary 2 of 2 PROGRAMMING D COMMAND p gt Trigger with setting time
88. data character output per Read Byte Subroutine starting at line 5000 Data character output should correspond to indication on Digital Readout previously verified for local operation Check that 1 Mode select logic outputs dBm mode 2 Range select logic sets NAUTO output true 3 Range counter is counted down to range 1 during Power Meter operating program cycle 8 111 Qamnnn WR 5 Table 8 4 18 Circuit Troubleshooting 14 of 18 Problem and Description Corrective Action 33 Error Power Meter does not respond Turn power on and off to Power Meter Then GO TO line 1040 properly to device clear and use STEP key to manually execute program line by line Check that the following indications are observed Description The Power Meter is first pro grammed to range 5 dBm mode free run at maximum rate Then a device clear is sent to the Power Meter to select Watt mode auto range hold operation Following the device clear a measurement is triggered the Power Meter is addressed a Line 1050 1 Power Meter configured for remote operation 2 The following display is observed with logic analyzer con nected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 012 g to talk and the Power Meter status range 10 001 010 1 11 000 001 5 and mode outputs are che
89. description of circuit operation for this test refer to Service Sheet 3 Mode Selection and Linear Under Range Registration Model 436A Service Table 8 4 HP IB Circuit Troubleshooting 7 of 18 Problem and Description Corrective Action Error Power Meter does not hold 0 after Check Power Meter data output per Read Byte Subroutine starting being auto zeroed five consecutive times atline 5000 Data output should correspond to front panel digi tal readout which was previously verified for local operation Description For the previous test the Power Meter was programmed to the Watt Mode thereby clearing the auto zero loop For this test the Power Meter data output is checked to ensure that the Power Meter remains zeroed while configured for Watt Mode Operation Error Power Meter range or mode out put character wrong Turn Power Meter on and off then manually program Power Meter to Watt Mode Range 1 trigger with settling time CMD U AIT Description Power Meter programmed to Watt Mode range 1 trigger with settling time Then Power Meter addressed to talk and range and mode output charac ters checked B Verify Power Meter Mode and Range character output per Read Byte Subroutine starting at line 5000 C Check that 1 Mode select logic outputs Watt Mode 2 Range Select Logic outputs range 1 3 Range Counter is preset to range 1
90. for the Universal Unlisten Command When any of these codes are placed on the HP IB data lines the Talk Decoder is enabled and provides a Talk Clock output in response to the HCLK input For any address but that selected by the factory installed jumpers however data bits 1 through 5 are coded such that the Address Decoder is disabled Thus the absence of the Address Enable signal causes the Talk Register to be clocked to the reset state by the Talk Clock 8 128 Listener Unaddressing The Remote Inter face Controller unaddress the Power Meter to listen by setting the Interface Clear IFC line true refer to previous description or by generating a Universal Unlisten Command Universal Unlisten Command is coded such that data bits 1 through 5 disable the Address Decoder and enable the Unlisten output of the Listen Unlisten De coder Data bits 6 and 7 are coded the same as for any valid HP IB listen address so they enable the Listen Unlisten Decoder to also provide a Listen Clock output in response to the HCLK input With the Unlisten Signal Active and the Address Enable Signal Inactive the Listen Register is clocked to the reset state by the Listen Clock 8 129 The method of unaddressing the Power Meter to listen described previously prevents the Power Meter from being unaddressed to listen when other instruments on the HP IB are desig nated as listeners There can only be one talker on the HP IB at a time but t
91. generates LCRD instructions as required to count the Range Counter down to range 5 8 101 A D Converter Auto Zero Function The Controller and Main Counter operating cycle asso ciated with auto zeroing the A D Converter is described in the following paragraphs a The Controller first generates an LCLR instruction to set the output of the Main Counter to 0000 and to store a positive sign in the Sign Latch YSPL high NSPL low b Controller then generates LAZ and LCNT instructions on the trailing edge of every 01 Clock Pulse while monitoring the Count Qualifier outputs of the Main Counter The LCNT instruc tions are processed by the Up Down Count 8 138 Control Logic as indicated in Table 8 7 to provide Up Clock outputs to the Main Counter The LAZ instructions are clocked into the Control Register by the HPLS 2 clock thereby maintaining a continuous LAZO output to the A D Converter c When the Count Qualifier outputs equal a predetermined value stored in the operating pro gram the Controller terminates the and LCNT instructions and generates an LCLR instruc tion The LCLR instruction returns the output of the Main Counter to 0000 and stores a positive sign in the Sign Latch YSPL high NSPL low The absence of the LAZ instruction causes the HPLS 2 clock pulse to reset the LAZO output of the A D Control Register thereby terminating the Auto Zero function 8 102 A D Converter Measurement Function Th
92. in quotes PRINT quote field and variables 1010 GO SUB print ERROR X 1 32 stop 1020 PRINT statement in quotes GO TO line 940 Figure 8 16 HP IB Verification Program HP 9830A Calculator 13 of 25 8 82 Model 436A service 940 IF THEN NO YES 950 RESTORE data pointer 960 IF THEN Page 8 81 NO YES 970 GO TO line 800 K Page 8 81 REM remarks BUS CMD Power Meter addressed to listen and programmed to range b dBm mode free run at maximum rate GO SUB RETURN output device clear BUS CMD Power Meter addressed to listen and programmed to trigger with settling time GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D digits ASSIGNMENT set error number to 33 Figure 8 16 HP IB Verification Program HP 9830A Calculator 14 of 25 8 83 Service Model 4364 1100 IF THEN YES 1110 IF THEN 1120 IF THEN YES 1140 GO SUB print ERROR 33 stop 1130 GO TO line 1150 ASSIGNMENT error number set to 34 RESTORE data pointer to start of line 1190 BUS CMD Power Meter programmed for dBm mode trigger immediate M Figure 8 16 HP IB Verification Program 9830A Calculator 15 of 25 8 84 Model 436A service 1180 loop seven times NEXT on line 1230 1190
93. indicate the RF input power level with respect to a reference value stored previously refer to Service Sheet 3 8 84 True Range Decoder The function of the True Range Decoder is to indicate the power level represented by the dc voltage at DC and if the power level is to be displayed in dB to preset the Main Counter to the minimum threshold of the range selected The Power Meter has five measure ment ranges Each range covers a power of ten 1 12uW 10 120 uW 100 uW 1 2 mW etc and slightly overlaps the previous range to prevent ambiguous measurements The exponents assigned to the five ranges vary according to the sensitivity of the Power sensor in use Thus the indication displayed for any range is only relative until the sensitivity of the Power Sensor is factored in The True Range Decoder accomplishes this by deter mining the sensitivity of the Power Sensor from the Mount Resistor Input then combining this information with the Range Select and Log Mode outputs of the Controller to address a ROM The resulting outputs of the ROM are described in the following paragraphs True Range Exponent This output is provided for both linear and dB operation of the Power Meter and consists of a five bit binary code which indicates the input power level as 10 8 121 Model 450A CIRCUIT DESCRIPTIONS Service Sheet 2 cont d b Watts Mode True Range This output is provided only for
94. is applied to the Remote Multiplexer to enable each word to be sequentially transferred over the HP IB After word 13 is transferred both the YO and Y7 outputs of the ROM go low and high HMDT qualifier is applied to the Remote Multiplexer to terminate the data transfer cycle The HMDT qualifier is then held high until the Word Counter is reset to O by the HHLD instruc tion generated at the start of the next program cycle 8 154 The remaining address input to the ROM is the signal When this input is low the outputs of the Word Counter select ROM addresses 00g through 15g when this input is high the outputs of the Word Counter select ROM addresses 20g 8 153 pervice Model 436A HBRFDq HBDACq HIDAV HIDAV DAV Output Gate Figure 8 20 Data Valid Status Generator Timing 8 154 Model 436 Service Table 8 10 Power Meter Talk HP IB Qutput Data Format 1 of 3 CEDE _____ CECENE IATE 20g Status 8 B Watts HUR amp R Over YM3 inputs to Range Line Selectors 5 Under L L H aon Log H Zeroing Zeroing Not E 1 IL Get te I Range 1 address EE 01g or 218 een i Data output Range 3 selected by YR1 YR2 amp L Range 4 pp YRS inputs t M Range 5 Range M Range 5 Line Selectors n 0224
95. is free running per previous programming commands Then the verification pro gram is manually restarted and a cal fac tor enable programming command is sent to the Power Meter followed by a device clear command After the programming commands are sent a talk cycle is en abled and the calculator checks the data output to ensure that the device clear command disabled the CAL FACTOR switch Corrective Action NOTE Operating program execution and circuit operation previously veri fied per local checkout procedure except as indicated below Check Power Meter data output per Read Byte Subroutine starting at line 5000 NOTE Operating program execution circuit operation previously veri fied per local checkout procedure except as indicated below Check Power Meter data output per Read Byte Subroutine starting at line 5000 Program Power Meter to free run CMD 0 R Then GO TO line 2000 and use STEP key to manually exercise program line by line Check that the following indications are obtained Line 2000 Cal Factor Disable Logic sets Cal Factor Disable output false front panel digital readout indication changes from 1 00 mW to 1 17 0 01 mW Line 2010 2430 Cal Factor Disable Logic sets Cal Factor Disable output true in response to LPU output of device clear generator Device clear places operating program in hold loop since measurement is not triggered display does not change
96. output checked Data output corresponds to minimum threshold of dBm range 1 30 dBm C Check that 1 Mode select logic outputs dBm mode 2 Range select logic outputs range 1 and resets NAUTO output 3 Range counter is preset to range 1 during Remote Initialize Subroutine Error Power Meter range mode or data output wrong Manually program Power Meter to dBm mode range 2 trig ger with settling time CMD 21 D2T Description Power Meter programmed to dBm mode range 2 trigger with settling time Then Power Meter addressed to talk and range mode and data output checked Data output should corres pond to minimum threshold of dBm range 2 20 dBm Verify Power Meter mode data and range character output per Read Byte Subroutine starting at line 5000 Data output should correspond to indication on Digital Readout previously verified for local operation C Check that 1 Mode select logic outputs dBm mode 2 Range select logic outputs range 2 3 Range counter is preset to range 2 during Remote Initialize Subroutine Error Power Meter range mode or data output wrong Manually program Power Meter to dBm mode range 3 irig ger with settling time CMD 0 D3T Description Power Meter programmed to dBm mode range 3 trigger with set tling time Then Power Meter addresse
97. range from range 1 to range 2 when a range 2 28 input power level is applied KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below a A D Converter input voltage at DC test point rises to greater than 1 200V in less than 10 seconds Range counter is counted up to range 2 during Over Range Subroutine and program branches to Delay Subroutine address 143 Converter input voltage at DC test point is stabilized at 0 316V by end of first Auto Zero Subroutine following Over Range Subroutine Set Range Calibrator RANGE switch to 300 uW and verify that Power Meter auto ranges to range 3 uW lamp goes out and mW lamp lights decimal point moves two positions to left and that Digital Readout indicates 0 316 0 002 mW DESCRIPTION This step verifies that the Power Meter will auto range from range 2 to range 3 when a range 3 2890 input power level is applied KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below a A D Converter input voltage at DC test point rises to greater than 1 200V within one second after input level is changed Range counter is counted up to range 3 during Over Range Subroutine and program branches to Auto Zero Subroutine address 146 A D Converter input voltage at DC test poin
98. refer to Service Sheet 8 Block Diagram Description Mode Selection and Linear Over Range Registration Manually program Power Meter CMD 2U GO TO line 2200 and use STEP key to manually execute program line by line Check that the following indications are obtained a Line 2200 Cal Factor Disable output of Cal Factor Disable logic is set false by programming command front panel Digital Readout indication changes from 1 000 mW to 1 176 mW Error Cal factor enable programming command does not enable CAL FACTOR switch Description The Power Meter is program med to watt mode range 3 CAL FACTOR switch enabled trigger with settling time Then a talk cycle is enabled and the calculator checks Power Meter data output Since CAL FACTOR switch is now enabled in the 85 position the data output should be 1 176 0 008 mW CAL ADJ control was previously adjusted to obtain a 1 000 mW indication with CAL FACTOR switch disabled Dis abling the switch is the same as setting it to 100 when it is enabled b Line 2220 2380 Power Meter outputs correet data charac ter Power Meter data character output can be verified per Read Byte Subroutine starting at line 5000 Model 436A Service CIRCUIT DESCRIPTIONS Paragraphs 8 68 8 69 and Table 8 5 were deleted 8 70 BLOCK DIAGRAM CIRCUIT DESCRIPTIONS 8 71 Service Sheet 1 8 72 The Model 486A is a dig
99. reference KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below a Program execution and circuit operation when dB REF switch is pressed Local Initialize Subroutine Mode select inputs loaded into mode register output of mode register indicates Power Meter configured for dB REF MODE Measurement Subroutine Branch to Log Conversion Subroutine Log Conversion Subroutine Branch to dB Relative Subroutine reference previously verified dB Relative Suhroutine Load sign and contents of main counter into reference register Load contents of reference register into relative register Count main and relative counters down until contents of relative counter 0 Branch to Display and Remote Talk Subroutine Program execution and circuit operation when dB REF switch released is same as above ex cept contents of main counter are not loaded into reference register DESCRIPTION This step verifies the up down counting of the main counter when a negative dB reference value is stored KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below NOTE dB Relative Subroutine address 171 YM171 not verified in previous step a When RANGE switch is set to 10 dBm main counter is counted down to obtain specified indication on Digital Readout W
100. strument may provide random outputs thereby causing the Power Meter to oper ate erratically KEY OPERATING SEQUENCE Power Up Subroutine Refer to Table 8 6 Operating Program Descriptions a Power Supply outputs are 15 0 0 5 less than 0 01 Vac ripple and noise 15 0 0 5 Vdc less than 0 01 Vac ripple and noise 5 00 0 25 Vde less than 0 01 Vac ripple and noise b Digital Readout indicates 31 6 8 0 mW Local Initialize Subroutine Branch to Auto Zero Subroutine Auto Zero Subroutine Refer to Table 8 6 Operating Program Descriptions Measurement Subroutine NOTE A D Converter input voltage at DC test point should be stabilized at 0 316 0 080 Vde at address 061 mW lamp is lit and all other front panel lamps are not lit Load input voltage into A D Converter ramp amplitude at RMP test point A3TP2 is 2 24 0 57 Vp p Initiate linear positive conversion and branch to Linear Positive Conversion Subroutine Linear Positive Conversion Subroutine Detect YPLS 0 at address 072 633 160 clock pulse 10 5 2 7 ms after address 071 Clear OVER and UNDER RANGE indications Branch to Display and Remote Talk Subroutine Display and Remote Talk Subroutine Display main counter output 316 80 and positive sign off 8 52 Model 436A Service Table 8 3 Standard Instrument Checkout 2 of 17 instrument
101. verified except as indicated below a UNDER RANGE lamp remains lit Local Initialize Subroutine Mode Register loaded b mW lamp goes out and dBm lamp lights Measurement Subroutine A D Converter input voltage at DC test point A3TP4 is 0 000 0 002V Main counter is preset to 0000 Digital Readout blanks 0 Sign is preset positive UNDER RANGE indicator is lighted Digital Readout is blanked Branch to Under Range Subroutine 8 61 26 8 62 Tahle 8 3 Standard Instrument Checkout 11 of 17 54 Instrument Setup and Test Procedure Test Description and Key Operating Sequence Set Range Calibrator RANGE switch to 0 dBm and FUNCTION switch to CALI BRATE Adjust Power Meter LZR po tentiometer A3R59 as required to ob tain 0 00 dBm indication on Digital Readout NOTE This step sets the A D Conver ter log threshoid When the specified indication is obtained the Digital Readout should be just on the verge of blanking the Digital Readout may randomly alternate between 0 00 dBm and UNDER RANGE blanked 0 Set Power Meter CAL FACTOR switch to 85 and verify that Digital Readout indi cates 0 70 0 02 dBm Then adjust CAL ADJ control as required to obtain the fol lowing indications a 1 01 dBm b 2 02 dBm After verifying indications set CAL FAC TOR switch to 100 and
102. when a predetermined condition is detected during execution of the program cycle On Figure 8 15 Sheet 1 fixed functions are Model 436A Service CIRCUIT DESCRIPTIONS 7 Service Sheet cont d indicated by a single line exit from a subroutine variable functions are indicated by multi line exits 8 90 For maintenance purposes it is convenient to think of each operating function as a window that can be opened or closed at some point in the program cycle In some cases the program opens the window for a fixed amount of time to enable the function then closes the window to terminate that function In other cases the program opens the window and latches a circuit to keep it open for the remainder of the cycle This type of window is then checked at the start of each future program cycle If the type of operation selected does not change the circuit is relatched to keep the window open for another cycle the type of operation changes the circuit is unlatched and a new circuit is latched to keep a different window open during the program cycle 8 91 In order to understand Power Meter oper ation to the level required for troubleshooting it is necessary to know exactly when why and how a window is opened or closed to enable or termi nate an operating function Table 8 6 is provided as an aid to this understanding This table describes the function s of each address or group of addres ses and references a signal f
103. zs TIHA ASSY LY Sin Sidi 1118 1389 EM BAS 52 f SSV V ON GMMSEUNNRNERIM OE Stu 30015 ALEZ 098 998 Sby SNGILYNOISHO 39N3H343U hex me owl oc sony 01000 gui c ssy LEV z M 5 310N 2001 WA GOL HA 4038 ur punoj sr uoneuuojur LAdLIO 338 0 HOSN3S H37MOd 1390 7777 438 001 012 3 19 MBER 54401101 i SE 02 02 uro us 104 p 3 eauejeg i Ma P 81 100 148 JA 375170 99 45 e 0 8 Old 0000 4 Yeas SIS TUN em rem Nonumes 123135 012 4 sa 20 372 6 pue suid c E NT pue gg gvx usaMiaq 1 1083990003 101983 0 4 10 UMOYS uonaauuca 72 od ur 9342132022 ing SUMO EET 0238 pajeoipur SAUN 7 epa 5310 1 ea Hen dmm m me mm ___________ ANTS Model 436A A4
104. 0 Check that 1 Mode select logic outputs dB REL mode 2 Range select logic sets NAUTO output true 3 Range counter is counted down to range 1 during Power Meter operating program cycle Manually program Power Meter to dB REF mode range 1 trigger with settling time CMD U C1T Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs dB REF mode 2 Range select logic outputs range 1 and resets NAUTO output 3 Range counter is preset to range 1 and output of mode select logic is loaded into mode register during Remote Initialize Subroutine Manually program Power Meter to dB REF mode range 2 trigger with settling time CMD U C21 Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs dB REF mode 2 Range select logic outputs range 2 3 Range counter is preset to range 2 during Remote Initialize Subroutine Model 436A Service Tahle 8 4 HP IB Circuit Troubleshooting 11 of 18 Error Power Meter range or mode output character wrong Description Power Meter programmed to dB REF mode range 3 trigger with set tling time Then Power Meter addressed to talk and range and mode output charac ters checked Error Power Meter range or mode output character wrong Description Pow
105. 0 e8uey Suope LQ enip eu 03 syndur q pue 20329390 Apasuog Josueg 941 pue LN Jo sasmuoo ona eu sjueuoduroo pue jo 20409394 AVIAIPISUEG 108095 fury pue 2012990 10596 EV 01 podde st 1010949 sosed ayy 3nd3no eur poseq 0192 79500 eq 03 9 jo 3nd3no eq esneo qr pusis Surqo3ts ZH 006 993 pue o mdu zH 055 eu Ueemyeq eoueleggtp eseud Luy T Jo ules suyseaul ue se 03 BN Suisneo pepunois si 90 01 mdu 3umaeauruou eu UO sum VUM jo ured e ue se sojexedo gf sum voum pue uo ux OF 219 sesneo 9323 SUL STO LAJ jo eje8 poydde st L ZH 025 X 1 OPA 91 O3 0 Area 10309 OO uo pue ETH suing peus styg ZOU pue OOUSV yno eseq eq 0 99 PTH 10129 09 VU OPA 91 03 0 03 1012905 s sneo pue pue uo sum pu s 519 OPA 9 0 910 jo y TZ
106. 0 011 8 01 000 011 16 6 Operating program brances from Remote Initialize Subroutine to Measurement Subroutine then continues to cycle normally as previously verified c Line 210 Power Meter configured for local operation d Line 250 2380 Power Meter is addressed to talk e Line 250 2390 Power Meter outputs complete data message Verify data message per Read Byte Subroutine starting at line 5000 3 Problem Power Meter data output Turn Power on and off to Power Meter Then GO TO line 140 and does not indicate dB REF mode use STEP key to execute program line by line Check that the fol selected lowing indications are obtained Description The Power Meter was pro a Line 160 grammed to the dB REF mode in the 1 Power Meter is unaddressed to talk previous Then the HP Interface Bus 2 Operating program branches from Display and Remote Talk was set to local For this test the Subroutine to Local Remote Branch Subroutine Program Interface Bus is set to remote and the then continues to free run as previously verified for local Power Meter is programmed to take a operation triggered measurement with settling time Thus the dB REF output of b Line 190 the mode select logic should be loaded 1 Power Meter is addressed to listen and configured for remote into the mode register during the opera operation ting program
107. 088 X04 E p ro 2 AGOS 4 YOLIFNNOD 82 v guvno 20 3 SISSVHO TNT E m Si Si 2 NO sine VU tu es 4 UE d I 5 Tu OU3Z OLAV 158 1 USE NOW T w 9 UN og 59 EN NYNLIY 8 t 825 3 i lt gt 2 drsta 0028 Syz E 3108 puos Lf 20 m ano C Si mmm 01 08211 a 3141 155 3 m NIV5 soos ev 50005 95506 OLY 0 4 aA O CL e rss a ILT 8 Ajquiessy ueg gy 06 8 amiy 0928 lt 39V110A 11829123 i aL NMOHSSV E 9190 9481 9n x m 10 i p 200904 em 9 ar werd AM X0 A A wo 285 39955 0978 00098981 ge 4 19 EEEE 7170 9981 s 5000 9984 n 1
108. 1 n gig 1 Seu 9 0 87 604 38 81 9 BED 598 0817 din 3740 058 pom E _ i MUNI IN ED MS i RN p Ayueaury 98 Mx 547 0008 AN abu 1 17 5 Ls og SISSYHO 4 E ti women PAD IDA 0 4 300W HYM m aean SH3AIdG HOISISRMVUT 300338 H317 j 38 1 0 OE 419170 30012 12 0992 999 7 77 7 2 7 Assy 0407 7 18 OPA SOE Nes BASS 30610 901 913 yay 63109 od aum 103135 UO LIVA 20 oll ume mide nau mimi ue eR 10 19510 veh 10 20 8 d j 2 sensn zc LE ryan om ler A 1 EE C 95009 92500
109. 1 and 2 are coded as listed previously to indicate to the Remote Interface Circuits which operating mode is selected for the Power Meter Additionally the signal is also applied to the Display Assembly to light the dB REL indicator when the dB Relative Mode is selected 8 98 When the front panel SENSOR ZERO switch is pressed the NZR input to the Auto Zero Timer enables the Sensor Zero output to be activated for a period of approximatley four seconds While this signal is active it overrides the Mode Select inputs to the Buffers and sets the IYM2 and the outputs to 1 and 0 respectively Thus if the Power Meter was not configured for Watts Mode operation when the SENSOR ZERO switch was pressed Watts operation will be enabled at the start of the first program cycle after the Sensor Zero signal is activated The Power Meter will then return to the operating mode selected by the Mode Select inputs at the start of the first program cycle following termination of the Sensor Zero signal While the Sensor Zero signal is active the remaining outputs of the Buffers are active and provide the following functions Sensor Auto Zero Enable This output is applied to the Auto Zero circuits to close the feedback loop to the Power Sensor b Sensor Auto Zero Status This output is applied to the Display Assembly to light the ZERO indicator 8 137 service Model 436A CIRCUIT DESCRIPTIONS Service Sheet 3 cont d
110. 11 14 received If both error numbers 4 and 4 5 10 011 110 7 O1 010 111 15 are detected it indicates that the Power 01 010 111 8 01 010 111 16 Meter did not respond properly to the pro gramming commands or that the Power 6 Range counter Service Sheet 3 is preset to range 2 Meter is improperly coding the STATUS and output of mode select logie is loaded into mode output character register during Remote Initialize Subroutine time 1 Operating program branches from Remote Initialize Subroutine and cycles to Display and Remote Talk Subroutine hold loop address 0228 023 g 0245 0255 b Line 430 2390 Power Meter outputs complete data message Verify data message per Read Byte Sub routine starting at line 5000 NOTE Status output is generated by buffering HOR and HUR outputs of over under range decoder and output of mode select logic Fora description of circuit operation for this test refer to Service Sheet 8 Mode Selection and Log Under Range Registration 5 Error Power Meter does not auto zero Change line 5000 to CMD U ZIV Then turn power on after ten tries and off to Power Meter and check that RF power is applied to Power Sensor GO TO line 5000 and use STEP key to manually execute Read Byte Subroutine Check that Description The Power Meter is program med to auto zero range 1 trigger with settling time Then the DATA output is checked to verify that it in
111. 2 113 6 0 2 mW 91 114 9 0 2 mW 90 116 3 0 2 mW 89 117 6 0 2 mW 88 87 86 85 Over Range Subroutine Light OVER RANGE indicator and blank Digital Readout A D Converter input Voltage test point A3TP4 1 010 0 002 1 020 0 002 1 031 0 002 1 042 0 002 1 053 0 002 1 064 0 002 1 075 50 002 1 087 50 002 1 099 50 002 1 111 0 002 1 124 0 002 1 136 0 002 1 149 50 002 1 163 0 002 1 176 0 002 Measurement Subroutine A D Converter Input Voltage at DC test point is adjustable to greater than 1 200V Ramp amplitude at RMP test point 2 is greater than 8 4 Vp p Linear Positive Conversion Subroutine Branch from address 075 to Over Range Subroutine 2403 clock pulses 33 4 ms after start address 071 Branch to Over Under Range Continue Subroutine Over Under Range Continue Subroutine Branch to Display and Remote Talk Subroutine 450A A D Converter Ramp Amplitude RMP test point A3TP2 7 171 0 014 7 242 50 014 7 320 0 014 7 398 0 014 7 467 0 014 7 554 0 014 7 633 0 014 7 718 0 014 7 803 0 014 7 889 0 014 7 980 0 014 8 066 0 014 8 158 0 014 8 257 0 014 8 350 0 014 DESCRIPTION This step verifies that the Power Meter is capable of detecting and indicating an OVER RANGE indication KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated b
112. 3 ASSY D1V ASSV 11V WOLLOS 7 19 18109081 SILON T ASSY 57 Xidddd ON SNOLLYNOISSG 23283834338 td WOtrZ 9956 soe May Pus say nosy 1 0 4 37 0021 9 Ag 9049717338 ag rd 0006 V3 2 w gt 5580 3281 en 1120 9281 3579 40 P 6vX 0 4 290255 psog Jeu eq ASI SHOLVYIASIY ALE 01V 0 4 ww UMOUS SB 19 00 JVA 24 0 2 jo sucneuBiseg St Arquiessy jo fre OWA IVA 822 Algquuassy sapnjaus uoneufisep peyeeiqqe i eel 48558 on euipno suoneufiisep 2218 0004 peg 1013905 801 19117 ll use 4599 pue Ajddng samad GY 7750 0960 empo amad auri LEY VOL P O W4P2 OR W11P2 022 351 eG 0 W2 0 W1P2 Figure 8 48 Rear View af Front Panel Removed IER OO SOT TEND Ae M CAII SCENA TOR lr
113. 3 of 3 ROM Output Data Qutput 1010 Notes REI 0000000000008 1 ROM address 13g or 33g HEX3 inputs to Line Selectors 1 ROM address 148 or 348 2 Data output se lected by ROM 2 Data output se LF H H 1 ROM address Line Feed 15g or 358 Character 0 9 lected by HEXO Carriage Return CIRCUIT DESCRIPTIONS Data Mode Operation cont d through 35g For all words except 3 and 10 the ROM is programmed redundantly to provide the same outputs for either a OX or 2X address input refer to Table 8 10 For Word 3 the ROM outputs an ASCII space code when the input is set high by a low NSPL input positive sign and an minus sign code when the input is set low by a high NSPL input negative sign For Word 10 the ROM provides an ASCH one code when the LQT input is set low by a high HEX 4 input and an ASCII zero code when the input is set high by alow HEX 4 input Paragraphs 8 155 through 8 163 were deleted 8 157 SERVICE SHEET 1 BLOCK DIAGRAM CIRCUIT DESCRIPTIONS The Block Diagram Circuit Descriptions for Service Sheet 1 are covered in paragraphs 8 71 through 8 74 Troublshooting in paragraphs 8 55 through 8 62 and Standard Instrument Checkout in Table 8 8 8 158 Model 436A Service SERVICE SHEET 2 BLOCK DIAGRAM CIRCUIT DESCRIPTIONS The Block Diagram Circuit Descriptions for
114. 3 output of the Range Counter will change the output of the True Range Decoder and the gain of the Amplifier Demodulator and Filter circuit a second time Depending on the type of failure present either an under range conversion or an over range conversion could be detected for range 3 Thus for this type of problem neither thefinalrangethat the Power Meter will settle on nor the resultant front panel indication can be predicted 8 63 To isolate a step 8 abnormal indication proceed as follows a Check the output of the Range Counter to determine what range the Power Meter settles on if the Power Meter settles on range 4 sync the logic analyzer on address 0524 as described in Example 1 to determine whether the operating program is cycling If the program is not cycling turn off power and reestablish the conditions of step 7 Then turn power back on release the RANGE HOLD switch and verify program execu tion starting at the Under Range Subroutine b the Power Meter has settled on range 4 and the operating program is cycling normally refer to Service Sheets 2 and 3 and isolate the problem to the True Range Decoder the Ampli fier Demodulator and Filter circuit the Over Under Range Decoder or the Display Assembly Table 8 2 Program Mnemonic Descriptions 1 of 5 NAUTO 8 4 6 Remote Initialize 10 11 Under Range Over Range Linear Positive only Log Conversion all Power Up Auto Zero Delay
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118. 5 93539 91 13385 3333 OR A8A1 ASSEMBLY CIRCUIT SIDE Figure 8 44 ABA1 Power Reference Oscillator Board Component Test Point and Adjustment Locations RE ABS REY SOS ct um UND NR a ____ __ __ __ __ _ _ __ _____ ENNIO hr nA 48A A 181 8 103811280 Gp 9 ainfi sw 12 5220 0281 P 6100 8281 0180 0581 P L 1920 7581 SNOLLYNSISIG 3313 93238 Nid SN01123NN02 LINQHID Q3 VH 931NI SU3HWRN Lu Vd Q31V8931NI YOLSISNVUL LAdL AG inano 83 04 H 9303 100385 ui uptjeuiiDjur I 308989 QLA 200 SM td iM 19 Eid 9M sepu 4sualsy piston SAUTUBYOIIIW ur zr spesej03id 338219208 suijo Ul 830935123 Sa LON XI438d ON ASSY V SNOILYNSISSO 33438 3334 g38WON LuVd 5543 3 23 11009 96900 Ajqutassy peog LY BY se gia duro 222 318100
119. 5 4 32 10 Word 2018 13g 109 LCRU 0015 0 1 201 3 Instruction Decoder enabled LCRU instruction generated to count down Range Counter 8 135 Service IV1UUu V1 EU CIRCUIT DESCRIPTIONS EEUU MM i aaa Service Sheet 3 cont d 4 4 a Address 001 clocked into State Register and applied to State Controller b Qualifier Register output still high logic 1 so State Controller produces word 201g 5 TB2 YR3 qualifier logic 0 clocked into Quali fier Register and applied to State Control ler Qualifier Register not clocked again until TC2 b State Controller produces word 0015 6 TB3 Instruction Decoder enabled LCLR instruction generated to clear Main Counter 7 TBA TC1 a Address 032 clocked into State Register and applied do State Controller A logic Q b State Controller produces word 032 8 2 etc Cycle continues de scribed in steps 1 through 7 B Example 2 Remote Qualifier gt Selection Starting Address 0355 Qualifier Instruction Next Address Select Select Select Code Code Code BIT 1514131211108 8 7 6 5 4 32 10 Word 0359 10 1010 10 1 1100 10 1 1 0 12 YR2 13g LCKM 026 0 0 026 2 TAI 2 4 1 T82 a Address 0263 clocked into State Register and applied to State Controller b Qualifier Register output is logic 0 so State Controller produces word 02
120. 65 c Remote Qualifier YRMT is input to Line Selector via Multiplexer in Remote Inter face Circuits When Instruction Code 30g ea ur 8 136 through 37g and Qualifier Select Code is 17g Instruction Decoder is disabled and Remote Qualifier is applied to State Controller via Line Selector 2 TA2 a Remote Qualifier clocked into Qualifier Register and applied to State Register b If qualifier is low logic 0 State Controller continues to output word 026g if qualifier is high logic 1 then word 226g is produced Qualifier Instruction Next Address Select Select Select Code Code Code rn n 15 14 13 12 1110 9876543210 Word 2264 X XXXI 117 1010 01 0 3 No operation Instruction Decoder disabled by Instruction Select Code 4 TA4 TBI a Next Address Select Code locked into State Register b State Controller produces word 0424 or 2528 5 etc Cycle repeated as described in steps 1 through 4 8 95 Asillustrated in the examples the operating program is not addressed in numerical order To simplify the understanding of how the program causes the circuits to operate Figure 8 15 is arranged so that all of the words associated with a particular function are grouped together and designated a subroutine After the power up subroutine is completed a complete program cycle is executed for each measurement The cycle is considered to start at the Local Initializ
121. 7 and branch to Display and Remote Talk Subroutine DESCRIPTION This step verifies the capability of the Power Meter to indicate a 91 of max negative power level KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below Measurement Subroutine A D Converter input voltage at DC test point 4 1 000 0 002V Linear Negative Conversion Subroutine Detect YPLS 0 and branch to Display and Remote Talk Subroutine at address a 131 for minimum specified level reference verified in previous step 133 for 10 00 mW or greater indication delay 2201 200 clock pulses from address 077 8 67 Service Model 436A Table 8 3 Standard Instrument Checkout 17 of 17 Instrument Siin and Test Porcedure Test Description and Key Operating Sequence 40 Set Range Calibrator RANGE switch to DESCRIPTION This step verifies that the Power Meter will de 30 mW and verify that OVER RANGE tect and display a negative power level OVER RANGE condition KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below A D Converter input voltage at DC test point is 8 68 greater than 1 200V b Program branches from address 134 of Linear Negative Conversion Subroutine to Display and Remote Talk Subroutine Set Range Calibrator RANGE switeh back
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123. 8 178 o 05 56 BM 0 9 gt 0 9 8 0 0 9 9 9 0 0 8 0 9 0 9 8 5 EXCEPT LCNT ALSO GENERATED TO CLOCK MAIN COUNTER YRMT SELECT CODES DISABLE SELECT LDAV 318 AS YRMT QUALIFIER SELECT LTALK 32g SELECT 33g SELECT LRFDO 348 SELECT LFAST 35g SELECT LHOLD 368 SELECT LREMOTE 37g gt LE ch uw ctu Figure 8 15 Operating Program Flow Chart 3 of 14 8 27 service Model 486A 4a POWER ON POWER UP SUBROUTINE 9090 BLANK DISPLAY CLEAR MAIN COUNTER AND SET SIGN LATCH LOAD CONTENTS OF MAIN COUNTER INTO REFERENCE REGISTER CLEARS REGISTER BISPLAY COUNT 0 AND SIGN OFF SET RANGE TO 00 AND AUTO ZERO A D CONVERTER 8000 COUNTS SET RANGE 7005 AND LOAD MODE SELECT REGISTERS mc d FROM DISPLAY AND REMOTE TALK SUBROUTINE SHEET 14 LOCAL REMOTE BRANCH SUBROUTINE 026 NO REMOTE SELECTED AUTO ZERO A D CONVERTER 1 COUNT NO el B TO LOCAL INITIALIZE TO REMOTE INITIALIZE SUBROUTINE SHEET 6 SUBROUTINE SHEET 5 Figure 8 15 Operating Program Flow Chart 4A of 14 8 28 Model 436A Service 4b
124. 8 17 The test program provided in Figure 8 16 is written for use on an HP 9830A Calculator and the program in Figure 8 17 is written for use on an HP 9820A Calculator The two programs are functionally identical their only differences are in the specific programming statements required for each calculator The HP IB Verification Program is also available on disk for use with the HP 98364 by ordering part number 00436 10047 A cassette is available for use with the HP 9825A by ordering HP part number 00436 10007 8 66 The test programs are designed to check out both the operation of the HP IB circuitry and that portion of the Power Meter operating program associated with remote operation After the program is loaded into the calculator memory it is executed by pressing the RUN and EXECUTE keys in sequence If the Power Meter functions properly the program will pause three times Each pause will be indicated by a printout directing that the CAL ADJ control be adjusted to obtain a specific front panel indication The first pause also directs that the Power Sensor be connected to the POWER REF OUTPUT When the proper indications are obtained for the first two pauses the program will automatically continue For the third pause the operator must press the CONT and EXECUTE keys to restart the program after the CAL ADJ and CAL FACTOR controls are adjusted to obtain the specified indication The test program will then cycle to the e
125. Display Assembly Program and Re mote Interface Cir cuit Initialization 10 Range Counter Main Counter Reference Register Display Assembly A D Converter Auto Zero Function A D Converter Auto Zeroing Circuit Oper tion covered under Digital Integrated Cireuits and Symbols Mode Selection Program Execution Remote Enable Model 436A Service 8 6 Operating Program Descriptions 2 of 11 Block Diagram Description Service Titl Program Execution Troubleshooting Refer Sub Routine Address Function Branch To 042 Check whether free run or triggered operation is selected a Branch to Remot Initialize sub routine Address 012 for free run or if trigger is re ceived to initiate program cycle Local Remote Branch cont d Table 8 4 Error 3 Measurement Rate Programming Com mand Processing b 043 if trigger not received Auto zero A D Converter Address 026 one count LAZ Table 8 4 Error 3 Option Converter Auto Zero Function Remote Address 013 Initialize Hold range selected in previous program cycle if autoranging selected Biank Instruetion Table 8 4 Error 3 HP IB Opt Range Selection Range Programming Command Processing Load remote range select Address 013 inputs into range counter if autora
126. During con version subroutines changes state when A D converter discharges through threshold Three bit code which selects measurement range as follows YR3 YR2 Range 0 Remote only 1 Invalid Power Meter automatically selects range 5 even if NAUTO high BRA c BA CO Co CO mM CO BS 2 3 4 5 1 Remote input When option installed serves as O transfer control signal refer to description and timing diagram provided under Principles of Operation Remote input When HP IB option installed functions in conjunction with YRMT HOLD to select measure ment rate as indicated below When BCD interface op tion installed functions in conjunction with YRMT to select measurement rate as indicated below FAST HOLD DACQ X low level high high pulse low high pulse high high level low high level Measurement Rate Disabled hold trigger with settling time trigger immediate free run at maximum rate free run with settling time 8 21 450A 8 2 Program Descriptions 3 of 5 Mnemonic Service Sheet YRMT Local Remote Branch HOLD Display and Remote Talk YRMT Display and Remote Talk MORE DATA YRMT Local Remote Branch REMOTE Delay Display and Remote Talk YRMT Display and Remote Talk RFDQ YRMT Display and Remote Talk TALK Relati
127. E COUNTER COUNT RELATIVE COUNTER DOWN 1 COUNT LOAD CONTENTS DF MAIN COUNTER INTO REFERENCE REGISTER COUNT RELATIVE COUNTER DOWN COUNT CLOCK MAIN COUNTER RELATIVE BORROW TO DISPLAY AND REMOTE TALK SUBROUTINE SHEET 14 FROM MEASUREMENT SUBROUTINE SHEET 7 LINEAR POSITIVE CONVERSION SUBR UTINE SHEET 8 ER RANGE SUBROUTINE LINEAR NEGATIVE CONVERSION SUBROUTINE SHEET 9 UE mammas xd rdc C NO RANGE YES YES AUTO RANGING ENABLED BLANK DISPLAY 4085 COUNT RANGE COUNT RANGE DOWN DOWN 1 8 aaa OVER UNDER RANGE LED YES RANGE NO TO AUTO ZERO TO DELAY SUBROUTINE Aa RANGE CONTINUE SUBROUTINE PES 7 SHEET 13 SHEET 12 Figure 8 15 Operating Program Flow Chart 11A af 14 8 44 Ce net we Sy uy Model 436A Service RELATIVE dB SUBROUTINE UNDER RANGE SUBROUTINE __ E ue 71 LOG CONVERSION SUBROUTINE 051 SHEET 7 SHEET 10 067 SHEET 8 077 SHEET 8 CD 37 SHEET 14 175
128. E Range 5 100 input power level KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below Measurement Subroutine Voltage at DC test point is adjustable to 1 001 0 003V Ramp amplitude at test point 2 is 7 1 Vp p Linear Positive Conversion Detect YPLS 0 at address 074 2004 clock pulses 33 4 ms after address 071 Branch to Display and Remote Talk Subroutine DESCRIPTION This step verifies that the CAL FACTOR switch is operating properly and that the Power Meter is capable of properly displaying a WATT MODE Range 5 117 input power level KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated on the following page 8 53 Service 4 coni 8 54 Position 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 Turn Power Meter CAL ADJ control clockwise as required to obtain OVER RANGE indication i e Digital Read out is blanked and OVER RANGE indicator is lit Table 8 3 Standard Instrument Checkout 3 of 17 Instrument Setup and Test Procedure Test Description and Key Operating Sequence Indication CAL FACTOR Switch 101 0 0 2 mW Position 102 0 0 2 mW 103 1 0 2 mW 104 2 0 2 mW 99 105 3 20 2 mW 98 106 4 0 2 mW 97 107 5 0 2 mW 96 108 7 50 2 mW 95 109 9 0 2 mW 94 1111 0 2 mW 98 112 4 0 2 mW 9
129. HP interface Bus is set to local to dis 2 Operating program branches from Display and Remote Talk Subroutine to Local Remote Branch Subroutine Program then continues to free run as previously verified for local operation able remote operation of Power Meter b Line 190 3 Power Meter is addressed to talk and 1 Power Meter is addressed to listen and configured for remote calculator enters data Since local opera operation tion is enabled the Power Meter mode out put should indicate the mode selected by the front panel switches 2 Measurement rate select logic stores programming command and provides low HOLD and high FAST outputs 3 Mode Select logic stores programming command and pro vides dB REF mode output 8 99 4 amas 2 Dervico 450A Tahle 8 4 HP IB Circuit Troubleshooting 2 of 18 pn Problem and Description Corrective Action 4 Operating program branches from Local Remote Branch Sub routine to Remote Initialize Subroutine 5 The following display is observed with logic analyzer con nected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 0125 Remote Initial ize Subroutine Address 00 001 010 1 01 000 011 9 00 001 011 2 01 000 011 10 00 001 101 3 01 000 011 11 01 000 001 4 01 000 011 12 01 000 010 5 01 000 011 13 01 000 011 6 01 000 011 14 01 000 011 7 01 000 011 15 01 00
130. ISPLAY CLOCK THRESHOLD TTL Logic pos DISPLAY TIME as desired MARK OFF COLUMN BLANKING to display Bits 0 3 Observe the logic analyzer NO CLOCK indicators to verify that a 01 clock input is applied to the Controller If either indicator is lit refer to Service Sheet 9 for information covering checkout and troubleshooting of the Clock Generator Circuits Service Sheet 1 indicates that Program Clocks are applied to the Controller from the Counter and Clock Generator Circuits and that a detailed block diagram of these circuits is provided on Service Sheet 3 Service Sheet 3 in turn indicates that a schematic of the Clock Generator Circuits is provided on Service Sheet 9 8 18 4 Move the logic analyzer CLOCK probe from 5 10 to A4TP2 and observe the NO CLOCK indicators to verify that a 02 clock is applied to the Controller If either indicator is lit refer to Service Sheet 9 for information covering checkout and troubleshooting of the Clock Generator Circuits 5 Return logic analyzer CLOCK probe to 10 and set remaining logic analyzer controls as indicated below These controls select the triggering of the logic analyzer and are adjusted as required to verify Power Meter program execution DELAY SET 00000 SAMPLE MODE REPET TRIGGER MODE START DISPLAY TRIGGER WORD switch settings specified select address 0525 qualifier 1 or 0 BIT 0 LO BIT 1 HI 2 LO BIT 3 HI addre
131. Initialize Subroutine to Auto Zero Subroutine 8 105 service Model 456 8 4 Circuit pon 8 of 18 Problem and Description Corrective Action Error Power Meter range or mode output Manually program Power Meter to Watt Mode range 4 trig 13 14 8 106 character wrong Description Power Meter programmed to watt mode range 4 trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked Error Power Meter range or mode output character wrong Description Power Meter programmed to Watt Mode range 5 trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked Error Power Meter range or mode output character wrong Description Power Meter programmed to Watt Mode auto range trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked ger with settling time CMD U 4 Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs Watt Mode 2 Range select logic outputs range 4 3 Range counter is preset to range 4 during Remote Initialize Subroutine 4 The following display is obtained with the logic analyzer connected normally refer to trouble shooting example and set up for single sweep TRIGGER WORD 0128 Remote
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133. MD Power Meter addressed to talk WAIT 5 second program delay 130 THEN Power Meter output data NO GO SUB print ERROR 1 stop Service 140 GO TO line 160 BUS CMD OUTPUT HP Interface Bus set to remote GO SUB RETURN trace subroutine change DISP RUNNING to PRINT for trace mode operation BUS CMD Power Meter addressed to listen and programmed to free run at maximum rate dB REF Mode 200 210 BUS CMD OUTPUT HP Interface Bus set to local GO SUB RETURN trace subroutine change DISP RUNNING to PRINT for trace mode operation A Figure 8 16 HP IB Verification Program HP 9830A Calculator 6 0125 8 75 Model 436A 8 76 5 IS REPEATED ONCE 230 240 ASSIGNMENT increment test number T 2 3 set error number to 2 250 GO 508 RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 260 IF THEN m dB YES Hef Mode NO GO SUB print ERROR 2 stop 270 GO TO line 290 290 IF THEN NO T 3 300 ASSIGNMENT error number set to 3 310 320 BUS CMD OUTPUT HP Interface Bus set to remote 330 GO SUB RETURN trace subroutine change DISP RUNNING to PRINT for trace mode operation Figure 8 16 HP IB Verification Program HP 9830A Calculator 7 of 25 1 Wo ees
134. NE SHEET 7 ENABLE LINEAR POSITIVE CONVERSION RAMP ENABLE LINEAR POSITIVE CGNVERSION RAMP COUNT ENABLE LINEAR POSITIVE CONVERSION RAMP A D CONVERTER OUTPUT POSITIVE 1200 COUNTS YES i00 COUNTS YES OR MORE DISABLE RAMP DISABLE RAMP DISABLE RAMP EXTINGUISH OVER EXTINGUISH OVER EXTINGUISH OVER UNDER RANGE LEDS UNDER RANGE LEDS UNDER RANGE LEDS E SENI EE GM PUMP MM etn E _ TO UNDER RANGE TO DISPLAY AND OVER RANGE SUBROUTINE REMOTE TALK SUBROUTINE SHEET 11 SUBROUTINE SHEET 12 SHEET 14 Figure 8 15 Operating Program Flow Chart 8A of 14 8 36 A Model 436A Service POSITIVE CONVERSION SUBROUTINE FROM 037 SHEET 7 067 SHEET 11 om TER SHEET 14 PETERE T PEE Figure 8 15 Operating Program Flow Chart 88 of 14 8 81 Service 9a FROM MEASUREMENT SUBROUTINE SHEET 7 LINEAR NEGATIVE CONVERSION SUBROUTINE 076 8 38 ane sl M X ENABLE LINEAR NEGATIVE CONVERSION RAMP CLOCK MAIN COUNTER ENABLE LINEAR NEGATIVE CONVERSION RAMP NEGATIVE 100 COUNTS OR MORE YES Figure 8 15 Operating
135. NVERTER AUTO ZERO REMOTE RANGE SELECTION FUNCTION 133 ms REMOTE MODE SELECTION A D CONVERTER MEASUREMENT FUNCTION CONVERSIGN A D CONVERTER AUTO ZERO FUNCTION 866 OR 932 msi AUTO RANGE UPDATE DIGITAL READOUT CHANGE RANGE 1 SEND OUTPUT DATA EASUREMENT NOTES Remote lamp lit continuously when remote operation selected The dBm range and mode selected are indicated by sign decimal point position d m and dB REL lamps Watts range and mode selected are indicated decimal point position and W mW and nW Lamps IN RANGE or QUT OF RANGE STATUS indicated under over range lamps digital readaut may be blanked for various outaf range indicatings REMOTE REMOTE input power level measured is clocked into digital readout If digital was bianked previously it will remain blanked Figure 8 14 Power Meter Operating Cycle 8 17 Service Model 430A TROUBLESHOOTING Standard Instrument Checkout cont d Note cont d as specified below for verifying pro gram execution Logic Analyzer Input Connect to DATA INPUTS BIT 0 DATA INPUTS BIT 1 DATA INPUTS BIT 2 DATA INPUTS BIT 3 DATA INPUTS BIT 4 DATA INPUTS BIT 5 DATA INPUTS BIT 6 DATA INPUTS BIT 7 DATA INPUTS GND CLOCK INPUT 2 Set the logic analyzer controls as indi cated below NOTE Unless otherwise indicated the logic analyzer controls are always set as specified below for verifying program execution D
136. OLVISNVEL Nomen 11101 SOW mm 6l ATX BL 222 Sui CIRCE ammu 53179 2151939 JOON X 8i DOTA 21 g 391 31901 40 HIMO AG Alty moms HITIOULNOD 21 15 8 a at 4 ELE INC E xoi 388 aA St 019 9 vis JA G i 14 JAG AAA aliy Nos 1131512 3H Service Model 436 SERVICE SHEET 12 CIRCUIT DESCRIPTIONS The circuits described in Service Sheet 12 are covered in paragraphs 8 111 through 8 154 HP IB Instrum nt Checkout in paragraphs 8 63 through 8 66 Troubleshooting in Table 8 4 and HP IB Verification Programs in Figures 8 16 and 8 17 8 180 VOCEZ vSCy 220 sinodo shg PIAN PHHH TM 3 Im Uu pangs S31V8 10H1N02 y t HIFSNVEL 7 ND po mag gob atio p 3710 1 47 poo sem emos Sb d zz 00 7T 527 1907 e 578 327 1531 ALF TASH 21901 E 30 1350 mm
137. OPERATING AND SERVICE MANUAL HP 436A POWER METER Including Options 003 004 and 022 SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 24104 and 24100 With changes described in Section VII this man ual also applies to instruments with serial num bers prefixed 1447A 1448A 1451A 1501A 1503A 1504A 1505A 1538A 1550A 1606A 1614 1629A 1713A 1725A 1746A 1803A 19084 1911A 1917A 19184 1930A 20084 2016A 2101A 22364A 28304 2347A and 23470 For additional important information about serial numbers see INSTRUMENTS COVERED BY MANUAL in Section I HEWLETT PACKARD Copyright HEWLETT PACKARD COMPANY 1975 1977 1980 1984 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A MANUAL PART NO 00436 90034 Microfiche Part No 00436 90035 Operating Information Supplement Part No 00436 90036 Printed JULY 1984 Model 436A Service SECTION VIII SERVICE 8 1 INTRODUCTION 8 2 This section provides principles of operation troubleshooting procedures and general service information for the Power Meter The specific content and arrangement of this section is outlined below a Safety Considerations Provides general safety precautions that should be observed when working on the Power Meter b Recommended Test Equipment Defines the test equipment and accessories required to maintain the Power Meter Service Aids Provides general information useful i
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139. OUTINE SUBROUTINE SHEET 11 SHEET 12 Figure 8 15 Operating Program Flow Chart 10A of 14 8 40 Ct wenn RADA Model 436A Service 106 CONVERSION SUBROUTINE 107 SHEET 7 q m es 13 8 1 1 07 23 03 03 B CD P 07 23 lt gt 03 154 0 lt 0 E 1 97 23 03 03 EN 07 04 0 1 8 4 1 CDY CADY CD NM 4 07 4 01 lt gt 23 lt gt 03 01 gt lt uon CD ____________________ Figure 8 15 Operating Program Flow Chart 108 of 14 8 41 450A 10 LOG CONVERSION SUBROUTINE Cont d a anaa aaa Rs CONT D FROM PRECEEDING PAGE TO 147 12 TO 170 REL 48 ISHEET 11 Figure 8 15 Operating Program Flow Chart 10 of 14 8 42 Cena AC Model 436A Service This page is intentionally left blank 8 43 pervice Model 486A FROM LOG CONVERSION SUBROUTINE SHEET 10 RELATIVE dB SUBROUTINE 48 REF SWITCH PRESSED LOAD CONTENTS OF REFERENCE REGISTER INTO RELATIV
140. Remote Multi plexer to inhibit the Power Meter from taking measurements see Figure 8 15 Sheets 4 and 14 b When either the 1101 or HIO4 data bit is low for a Triggered Measurement Programming Command the Trigger Flip Flop is set by the Rate Clock output of the Function Decoder then reset by the LTC instruction generated at the start of the operating program Display and Remote Talk Subroutine While the Flip Flop is set the OR gate is enabled and provides a low H HOLD output to the Remote Multiplexer to initiate a Power Meter measurement After the measurement is completed and the flip flop is reset the OR gate is disabled by the low outputs of the Hold and Trigger Flip Flops Thus the gate provides a high H HOLD output to inhibit further measurements until a Free Run or Triggered Measurement Programming Command is received 8 146 The output of the Trigger Flip Flop is also gated with the LTLK output of the Talk Register to provide a Talk Qualifier HTLK 032g input to the Remote Multiplexer When the Power Meter is not addressed to Talk the LTLK signal is high and a low HTLK input is applied to the Remote Multi plexer to inhibit the operating program from initi ating an Output Data Transfer When the Power Meter is addressed to Talk the LTLK input is low and the HTLK output of the gate is controlled by the Trigger Flip Flop as described in the following paragraphs a When the Trigger Flip Flop is reset by a Hold Progr
141. Remote Talk output data transfer 1 Option 4 Talk Cycle cont d LSDAV Table 8 5 Step 2 5 Measurement Rate BCD Option Programming Re mote Qualifier Program Interface and Talk Cycle 110 Check whether data ac Address 111 if data Table 8 4 Error 3 Program Execution cepted line set to indicate accepted 1 HP IB Option 4 Talk Cycle data received OK DACQ Table 8 5 Step 2 31g BCD Option 5 Address 106 if data Table 8 5 Step 3 not accepted BCD Option N A for HP IB Option 106 Auto zero A D converter Address 110 Table 8 5 Step 3 2 Analog to Digital one count LAZ BCD Option Converter Auto N A for HP IB Zero Function Option 111 Reset data valid line to Address 112 Table 8 4 Error 3 indicate data transferred 1 4 Talk Cycle LSDAV Table 8 5 Step 3 BCD Option 5 Measurement Rate Programming Re mote Qualifier Program Interface and Talk Cycle 112 Check whether Power Meter Address 110 if Table 8 4 Error 9 Program Execution has more data for remote more data 1 Option 4 listener DATA 338 for BCD Option 9 Measurement Rate 8 134 Local Remote Branch Subroutine Address 026 if no more data Table 8 4 Error 2 HP IB Option Table 8 5 Step 3 BCD Option Programming Re mote Qualifier Program Interface and Talk Cycle Model 436 CIRCUIT DESCRIPTIONS
142. S 2250 GO SUB print ERROR 45 stop 2240 GO TO line 2260 2260 2270 BUS CMD OUTPUT Power Meter unlisten calculator talk HP Interface 2280 Bus set to local then remote Power Meter stays in local refer to Ser vice Sheet 4 2290 PRINT text in quotes 2300 Figure 8 16 HP IB Verification Program HP 9830A Calculator 24 of 25 8 93 Service 8 94 450A Print Error Subroutine 2310 PRINT error number 2320 STOP press CONT EXECUTE to restart program at line 2330 or RUN EXECUTE to restart program at line 10 Line 2320 may be eliminated to run listing all Errors 2330 RETURN to line following GO SUB branch to subroutine Trace Subroutine 2340 REM Adds PRINT for TRACE 2350 DISPLAY RUNNING 2360 RETURN to line following GO SUB branch to subroutine Enter Data Subroutine REM enter data BUS CMD Power Meter programmed to talk calculator to listen ENTER calculator set up to read status S range mode M and data D 9 digits RETURN to line following GO SUB branch to subroutine Device Clear Subroutine REM DEV CLR BUS CMD Power Meter unlistening calculator talk OUTPUT Set HP Interface Bus to command mode output device clear then set HP Interface Bus to data mode GO SUB trace subroutine 2450 RETURN to line following GO SUB reference to subroutine 2460 END Figure 8 16 Verification Prog
143. SPL YSPL Output Notes Ref Ref 7 ERE E Pulse High High High X Up Clock 1 2 Pulse High High Low x s X Down 1 2 Clock Function A D Converter Auto Zeroing and DC Input Loading A D Converter Linear Conversion A D Converter dB Conversion Counter dB Rel Conversion 1 X indicates don t care 2 Main Counter always preset to minimum threshold of range selected 20 00 dBm 10 00 dBm and counted in direction of increasing power Thus if Sign Latch is preset positive Main Counter is counted up if Sign Latch is preset negative Main Counter is counted down If Main Counter is counted through 0000 Borrow output toggles Sign Latch thereby causing output and count direction to reverse 3 The purpose of the dB Relative function is to indicate an input power level with respect to a reference value stored in the Reference Register This function is effected as follows First the dB value of the RF input power level is acquired via conversion b The reference number stored in the Reference Register is loaded into the Relative Counter The Relative Counter counted down to 0000 d The sign of the stored reference is compared with the sign of the RF input power level If the signs are the same the Main Counter is counted down to subtract the reference value from the measured value if the signs are not the same the Main Counter
144. Service 436A CIRCUIT DESCRIPTIONS Data Mode Operation cont d 8 133 General Programming Command Decoding When the HP IB is in the data mode and the Power Meter is addressed to listen the high LATN and H Listen signals enable the Function Decoder The Function Decoder then processes the data bit 4 through 7 inputs each time that the is generated to indicate that valid data is present on the HP IB In Table 2 2 it is shown that either data bit 6 or is true 0V for each of the programming codes assigned to the Power Meter With either of these data bit inputs low for the conditions de scribed LATN high LCLK low H Listen high the Function Decoder is gated on and decodes the HIO4 HIO5 and 06 inputs to generate a Clock output which enables the appro priate logic circuit to respond to the programming command The specific Clock output generated for each programming command is listed in Table 8 8 and the resulting logic circuit operation is sum marized in Table 8 9 8 134 When the HP IB is not in the data mode the Function Decoder is disabled by low LATN input Similarly when the Power Meter is not addressed to listen the low H Listen input disables the Func on Decoder While the Function De coder is disabled it does not respond to the data bit inputs and so no Clock outputs are provided to the Progamming Command Logic Circuits Thus the Programming Command Logic Circuits are inhibi
145. Service Sheet 2 are covered in paragraphs 8 75 through 8 86 Troubleshooting in paragraphs 8 55 through 8 62 and Standard Instrument Checkout in Table 8 8 8 160 Model 436A 69 8 32019 yesaag 12 8 911814 a1 L 1ndinO civiuoso i 49 QUHI gt cr M ivinsas _ 238 0304 2 suos 2 G38 Os 9 1 s m mmc AGi H3M0d 4 am ae 2350 8 2320 INT is 123135 310W3U 220 NOLLdO i SNE 1084405 GU VXOVd LLT IMAH U3JSNVUJA VIVO WOH3 0L H3IIUTVOO 1953138 Yad TNO 310039 7 123135 340 28 7 1 5 2010 WVHUOO0Ud Snivis 0932 010 YOSNIS 0 H24ND00 JALLVT3H 74545 JONVY SALVAS LIS FJGOW SLG 1 2 uvis oon QNI ONE 38081514002 ONY NOIS im 3 1 104100 UFLNNOD ONY NOIS 9 7 NBIS AY SIG SAAS OTAS TNA Ta 6 F ANSNOdX3 3041 S m 3 5 gt 8 mis m 8 i gt gt 15
146. Sign Latch to load the output of the Main Counter into the Display Registers and to indicate to the Remote Interface Circuits that the measurement is completed If dB REF or dB REL operation is selected a rela tive dB conversion is performed as described below before the LTC instruction is generated 8 110 A D Converter Log Over Range Regis tration Registration of an over range conversion is described in the following paragraph a The LRMP instruction is terminated causing the HPLS 2 clock to reset the LRMP output of the A D Control Register With this signal reset the LRL output of the A D Control Gates is disabled thereby terminating the conver sion b The LCNT instruction is also terminated to freeze the number in the Main Counter An LCOR instruction is generated to reset the outputs of the Over Under Range Decoder d if the measurement was taken on range 1 through 4 with Auto Ranging enabled an LCRU instruction is generated to count the Range Coun ter up one range then another measurement is taken This cycle is repeated until an in range measurement is obtained or the Range Counter is counted up to range 5 e If the measurement was taken on range 5 or on ranges 1 through 4 with Auto Ranging disabled an LCRU instruction is not generated to count the Range Counter up Instead the Mode Qualifier Bits are checked to determine whether dBm dB REL or dB REF operation is selected If dBm operation
147. Status Generator The Data Valid Status Generator functions in conjunction with the operating program to generate the timing signals necessary to complete a Power Meter initia ted data transfer A timing diagram of Data Valid Status Generator operation is provided in Figure 8 20 As shown in the figure the JK flip flop is initially reset by the LPU input and cannot change state until the Power Meter is addressed to Talk and all listeners on the HP IB indicate that they are ready to accept data When this occurs both the 8 152 Qarwina Model 436 Service CIRCUIT DESCRIPTIONS Data Mode Operation cont d 2 and the NRFD inputs will be high and the Data Valid Status Generator will provide a high HRFDq qualifier input to the Remote Multiplexer If the HP IB is connected properly the HDACq qualifier will be low at this time and the operating program will generate an LSDAV instruction to set the JK flip flop NOTE The HRFDq and the HDACq qualifier outputs of the Data Valid Status Genera tor are delayed slightly to allow settling time for the HP IB listeners When the JK flip flop is set the combination of the high HIDAV and HOE 2 signals cause the output gates to set the DAV line low thereby indicating that valid data is available on the HP IB Word Counter ROM and Output Gate operation is described in the following paragraph After all of the listeners on the HP IB accept the dat
148. T 9 154 165 167 SHEET 10 147 14 le 05 lt gt 9 19 m gt d TO 056 SHEET 6 10 TO 036 SHEET 13 ca ah gt as a eee tall OVER UNDER RANGE CONTINUE SUBROUTINE Da a Figure 8 15 Operating Program Flow Chart 128 of 14 Service 12b 8 47 Service 13a DELAY SUBROUTINE m ne 8 48 gt FROM REMOTE INITIALIZE SUBROUTINE SHEET 5 UNDER RANGE SUBROUTINE SHEET 11 OVER RANGE SUBROUTINE SHEET 12 CLEAR MAIN COUNTER AUTO ZERO CON VERTER 5 TIMES 8080 COUNTS EACH CLEAR MAIN COUNTER REMOTE ENABLED AUTO ZERO A D CONVERTER TWICE 8000 COUNTS CLEAR MAIN COUNTER TO AUTO ZERO SUBROUTINE SHEET 6 Figure 8 15 Operating Program Flow Chart 13A of 14 pm Model 436A e e e e O Model 436A Service DELAY SUBROUTINE NER REN FROM 031 SHEET 5 185 SHEET 11 143 SHEET 12 Soo Ea
149. V oy 03 93 pue eSe3 oA ayy uSnoxuj peydde si 01 0 0 180815 SurqogiAs ZH 062 ou TeUBIS ZH 020 99 ueAnp st 108u98 9128 Surdures 1090909 seyg IL 1019919 eseugd Jogipdury 993 ut x10439u OY e uongounfuoo Ul OSTE ZQY pue pue yomu erpeaed ay 195 st ZH OFZ 3101 ssedpueq peunj 44 vene v 191 SI quomo pue gpuzv 44 pue ZoUsV SI 720 V uo2e 05 40048 jo sured pejerosse pue pue paru p OLY pue 8 Aq peuruuejep 19995 39IAH3S si ou JO 31 13180 UI S92UOIOJIID 10 ejesueduioo 4195 s 04002 POY IVO pwed quo oSvjpo 98945 ue sjueuoduioo sy put NEV UM Ose jo 993 St ZH 002 amp ouenbeaj
150. Watt Mode Check that the LAZO instruction at pin 2 is pulsed low This turns transistors A8Q5 and A3Q10 off and turns FETs A8Q14 and A3Q20 on causing YPLS to be 2 0 volts dc during the A D Converter s Auto Zero cycle YPLS is at 5 volts while the ramps are discharging at 0 when the Comparator A3U2 switches from high to low and at 2 during the A D Auto Zero cycle Phe time that each instruction remains low is de termined by the program ADRA ayisoddo eu 01 pjouseziq ayy souotex uejsuoo 20 leu s smp enev Jo yed TEV esneo YTT aqeuq ey eomos Surdjdde 03 durey yL 3ndut Ut ay prosor jo andui SunieAut y A 0 Ajoyeurrxoidde 0 sonper espd xoop Au cg st syueunsnfpy uonoes ejsnfpe st jo13uoo andur sesneo JUT ud genev eq 49 8uronpoad snug jo ures pue opuev dgenev neou ZHASgV jo mdu egoa 1 SurA dde
151. a the DAC input to the Data Valid Status Generator goes high causing the Status Generator to provide a high HDACq qualifier output to the Remote Quali fier Multiplexer The operating program in turn detects the change in state of the HDACdq qualifier and generates a second LSDAV instruction to reset the JK flip flop The low HIDAV output then disables the DAV output of the Output Gates and the negative to positive transition of the LIDAV signal clocks the Word Counter to the next ROM address As shown on Sheet 14 of Figure 8 15 this cycle is then repeated until all 14 of the output data words are sent over the HP IB Note that the JK flip flop is reset after each word is transferred Thus the JK flip flop will be reset by the last LSDAV instruction of the Output Data Transfer and wil remain reset until the operating program initiates the next Output Data Transfer 8 150 Word Counter ROM Line Selector Multiplexer Gate and Output Gate Operation of these circuits function together to sequentially output data words 0 through 13 each time that the operating program enables an Output Data Trans fer during the Display and Remote Talk Sub routine Each word consists of seven data bits which are ASCII coded to select a status character as indicated in Table 8 10 Coding of data bits 7 6 and 5 is accomplished by buffering the Y6 Y5 and Y4 outputs of the ROM Coding of the remaining data bits is controlled by the Y7 output of
152. adjusting the FREQ ADJ control L1 50 MHz Oscillator The oscillator circuit is made up of common emitter amplifier Q1 and its associated components Resistors R12 R13 R14 and R15 bias Q1 for an emitter current of approximately 5 mA The r network tuned circuit C11 C13 C14 and L1 determines the operating frequency The amplifier gain is set by the operating circuit impedance across the tuned circuit and the emitter resistor 14 which is ac coupled to ground by C12 The positive feedback required to sustain oscillation is satisfied in this circuit Phase shift of 180 is a characteristic of both common emitter amplifiers and 7 network tuned circuits This feedback is coupled through C9 and C10 back to the base of Q1 The FREQ ADJ control L1 sets the oscillator s frequency ALC Loop At the positive peak of each cycle current momentarily flows from the feedback loop through peak detector diode CR2 to C7 The resultant stored charge is coupled as a dc input voltage to pin 8 of U2 The peak detector s outputiscompared to the very stable reference input by comparator U2 Any difference between the comparator s input voltages produces an error voltage at the dc output The comparator s output is coupled to a reactance voltage divider capacitor and varactor CR3 As the error output voltage goes more positive the capacitive reactance of CR3 decreases which reduces the oscillator feedback Conversely a more negative output voltage
153. alibrated for both linear and log measurements KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for A D Converter refer to Service Sheet 8 Set Range Calibrator RANGE switch to 15 dBm Verify that UNDER RANGE indi cation is observed set RANGE HOLD switch to off out and verify that Digital Readout indicates 15 00 0 50 dBm Then set Range Calibrator FUNCTION switch to STANDBY press Power Meter SENSOR ZERO switch return Range Cali brator FUNCTION switch to CALIBRATE when ZERO lamp goes out and verify that Digital Readout indication is 15 00 50 02 dBm DESCRIPTION This step verifies that the main counter is preset properly and that it can be counted down normally for the negative dBm ranges KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for main counter preset and down counting refer to Service Sheet 9 Set Range Calibrator RANGE switch to 10 00 dBm and adjust Power Meter CAL ADJ control to obtain the following indications DESCRIPTION This step verifies branching between various addresses in the Log Conversion Subroutine KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for branching between Log 9 99 dBm Conversion Subroutine addresses listed below b 9 97 dBm OVER RANGE blanked 0
154. amming Command a continuously high HTLK qualifier is applied to the Remote Multi plexer to enable the operating program to initiate an Output Data Transfer after completing the measurement in progress refer to Figure 8 15 Sheet 14 Following the Output Data Transfer the operating program then detects the hold condi tion in the Local Remote Branch Subroutine H HOLD high and enters an idle state while awaiting Free Run or Triggered Measurement Programming Command to initiate the next measurement b When the Trigger Flip Flop is set by a Free Run or Triggered Measurement Programming 8 151 KAYE WIOUCL 400A CIRCUIT DESCRIPTIONS Data Mode Operation cont d Command a low HTLK qualifier is applied to the Remote Multiplexer until the flip flop is reset by the LTC instruction generated at the start of the Display and Remote Talk Subroutine Since this instruction is generated before the operating pro gram checks whether Remote Talk is enabled the resulting HTLK qualifier enables the operating program to initiate an Output Data Transfer during the Display and Remote Talk Subroutine If the Trigger Flip Flop was set by a Free Run Program ming Command the H HOLD qualifier will be low and the operating program will continue to take measurements and output data after each measure ment until a new Measurement Rate Programming Command is received or the Power Meter is unaddressed to talk If the Trigger Flip F
155. ange 5 Step 15 range 3 Under Range 174 175 Light UNDER RANGE lamp LSUR if measure ment was taken on ranges 2 through 5 Address 176 if measurement was taken on ranges 2 through 5 Display Assembly Over Under Range Continue Subroutine Address 047 if meas ment was taken on ranges 0 or 1 Table 8 3 Step 20 A D Converter Lin ear Under Range Conversion A D Converter Log Under Range Conversion Range Selection 176 j Blank display LSOR if auto ranging enabled Address 105 if auto Table 8 3 Step 8 ranging enabled Over Under Range Continue Subroutine Address 047 if auto ranging not enabled Table 8 3 Step 7 8 130 x 1 Model 436A Service Table 8 6 Operating Program Description 8 of 11 Troubleshootin Block Diagram Deseription Sub Routine Address Function Branch To 9 Sheet Under Range 105 Count range counter down Auto Zero Sub Table 8 3 Step 8 cont d one range LCRD routine Address 056 if measurement was taken on range 4 or 5 Delay Subroutine 8 3 Step 15 Address 036 if measurement was taken on range 2 or 3 Over Range 147 Blank Display LSOR Over Under Range Table 8 3 Step 5 2 Display Assembly Continue Sub LSOR instruc routine Address tion Step 6 B A D Converter 047 if auto ranging i branch to address Linear Over Range is not enabled 047 Conversion
156. at they provide for remote control of Power Meter operation and remote display of the results When remote operation is enabled the Pushbutton Switch Assembly is disabled the Dis play however remains enabled and provides a local display of the output data transmitted to the remote controller g Power Reference Oscillator The Power Reference Oscillator is enabled when the front panel POWER REF ON switch is depressed and provides 1 mW at 50 MHz output for calibration purposes h Power Supply Assembly The Power Supply Assembly is enabled when the LINE ON OFF switch is set to the ON position and provides 5 15 and 15 outputs necessary for operation of the Power Meter circuits 8 75 Service Sheet 2 8 76 Amplifier Demodulator and Filter Circuit The Amplifier Demodulator and Filter Circuits convert RF input power levels applied to the Power Sensor into proportional de outputs The basic operation of these circuits is described in the following paragraphs a The Power Sensor dissipates RF input power into a 50 ohm termination and generates a de voltage proportional to the RF input power level b The 220 Hz Multivibrator provides the 220 Hz drive signals to the Power Sensor to switch the voltage and thereby generate a modulated 220 Hz signal which is proportional in amplitude to the input power level and in phase with the 220 Hz reference signal applied to the phase detector Power Sen
157. ation of in range and over range conditions is covered in the following paragraphs 8 108 A D Converter Log Under Range Registra tion Registration of a log under range conversion is described in the following paragraphs 8 141 CIRCUIT DESCRIPTIONS Controller generates an LSUR instruction followed by an LSOR instruction to enable the LED and LBLANK outputs of the Over Under Range Decoder The UR LED output lights the front panel UNDER RANGE indicator and the LBLANK output blanks the front panel display The HUR and out puts are gated together by the Remote Interface Circuits to provide one of four possible status outputs to the Remote Interface Controller b If the measurement was taken on ranges 2 through 5 with Auto Ranging enabled and LCRD instruction is generated to count the Range Coun ter down one range then another measurement is taken This cycle is repeated until an in range measurement is obtained or the Range Counter is counted down to range 1 c If the measurement was taken on range 1 or on ranges 1 through 5 with Auto Ranging disabled an LCRD instruction is not generated to count the Range Counter down Instead the Mode Qualifier Bits are checked to determine whether dBm dB REL or dB REF operation is se lected If dBm operation is selected an LTC instruction is generated to transfer the output of the Sign Latch to the fr
158. bled Following each dB REF dB REL conversion the outputs of the Main Counter 0000 are loaded into front panel Display Register by the LTC instruction 8 113 When the dB REF switch is released the new Mode Select Code is loaded into the Mode Register at the start of the next program cycle to enable the dB REL mode For this mode an LLRE instruction is not generated after an in range log conversion Thus the reference stored during the last program cycle is used for each dB relative conversion The Controller and Main Counter operating cycle associated with the dB relative conversion is described in the following paragraphs a An LCOR instruction is generated to load the output of the Reference Register into the Relative Counter and to set the Relative Counter 0 NR ZO qualifier to logic one When this qualifier subsequently changes state the Controller will detect that the conversion is completed b Controller generates an LREL instruction to count the Relative Counter down one count This is necessary because the Relative Counter has to be clocked one count past 0000 to change the state of the Relative Counter 0 NRZO qualifier c Controller monitors the Relative Counter 0 qualifier set to logie 1 by LCOR instruction while generating LREL and LCNT instructions on the trailing edge of every negative altemation of the 01 clock pulse The LREL instructions serve as down clocks to the Relative
159. c RF Blanking This output is available at a rear panel connector for suppression of an external instrument s RF output 8 99 Range Selection The Auto Range Qualifier input is applied to the Controller in a WIRED OR configuration to enable local or remote control of this function Remote Enable line high or low respectively When this input is low the operating program is enabled to count the Range Counter up LCRU instruction or down LCRD instruction as required to obtain an in range measurement When the input is high the operating program is inhibited from changing the range upon detection of an under range or over range condition Thus for local operation a high Auto Range Qualifier input causes the Power Meter to hold the last range previously selected in the Power Up Subroutine or during execution of the operating program For remote operation a high Auto Range Qualifier input causes the Remote Range Select inputs to be loaded into the Range Counter at the start of each program cycle to select a specific range for each measurement 8 100 In addition to checking the Auto Range Qualifier at various points in the program cycle the operating program also checks for an invalid range selection at the start of each cycle When remote operation is selected ranges 6 and 7 are considered invalid when local operation is selected range 0 is also considered invalid Upon detection of an invalid range the operating pro gram
160. ce range 1 was previously programmed the Power Meter should output status character P indicating that a valid measurement was taken For Watt Mode range 1 an UNDER RANGE indication is not gen erated during the Under Range Subroutine Remote Initialize Subroutine address branching is as follows 10 001 010 00 001 111 00 001 011 10 011 001 10 001 101 00 011 110 00 001 110 01 010 111 Range counter Service Sheet 3 is preset to range 1 during Remote Initialize Subroutine Operating program branches from Remote Initialize Subroutine to Delay Subroutine Power Meter outputs correct data characters Check Power Meter status output per Read Byte Subroutine starting at line 2500 NOTE Status output is generated by buffering HOR and HUR outputs of over under range decoder and output of mode select logic Fora description of circuit operation for this test refer to Service Sheet 3 Mode Selection and Linear Under Range Registration GO TO line 640 and use STEP key to execute program line by line Check that the following indications are obtained a Line 640 1 Auto zero enable logie is reset 2 Mode enable logic outputs Watt mode h Line 660 Power Meter outputs correct status Status output can be verified per Read Byte Subroutine starting at line 5000 NOTE Status output is generated by buffering HOR and HUR outputs of over under range decoder and output of mode select logic Fora
161. cked to verify 10 001 011 2 01 000 011 6 proper response to the device clear 00 001 100 3 01 000 011 7 00 001 101 4 01 000 011 8 3 dBm output of mode select logic is loaded into mode register b Line 1060 2430 1 Device clear decoder Service Sheet 11 generates LPU output in response to device clear command 2 Mode select logic outputs Watt mode in response to LPU input 3 Range select logic sets auto range qualifier true in response to LPU input 4 Measurement rate select logic sets H HOLD output true in response to LPU input 5 Operating program initialized to starting address 000 by LPU signal Program then cycles to Local Remote Branch Subroutine hold loop 0264 0424 043 when LPU signal is terminated During Power Up Subroutine watt mode output of mode select logic is loaded into mode register c Line 1076 Measurement triggered and operating program cycles to hold loop in Display and Remote Talk Subroutine During program cycle range counter is counted down to range 1 d Line 1080 2380 Power Meter outputs correct status mode and range characters Power Meter output can be verified per Read Byte Subroutine starting at line 5000 34 Error Power Meter incorrectly decodes address data as device clear Description The Power Meter is pro grammed to the dBm mode and a meas urement is triggered to load the mode select registers Then a number of ASCII characters ar
162. configured for remote operation 2 H HOLD output of measurement rate select logic is set high by LTC instruction 3 Operating program enters Display and Remote Talk Sub routine hold loop addresses 0228 0233 0245 0258 Line 360 2390 first pass 1 Power Meter outputs complete data message ignore data then branches to Local Remote Branch Subroutine 2 Power Meter enters Local Remote Branch Subroutine hold loop f Line 340 second 1 Measurement rate select logic provides low HOLD output to initiate program cycle Program branches to Remote Initialize Subroutine 2 The following display is observed with the logic analyzer connected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 0125 Remote Initialize Subroutine address 8 101 service 450A 8 4 HP IB Circuit Troubleshooting 4 of 18 Problem and Description Corrective Action 001 010 111 Xs 001 ii 010 111 i 10 001 101 01 010 111 11 00 001 110 01 010 111 12 00 001 111 01 010 111 13 10 011 001 01 010 111 14 10 011 110 01 010 11 15 01 010 111 01 010 111 16 3 Operating program branches from Delay Subroutine to Auto Zero Subroutine and cycles to Display and Remote Talk Subroutine 4 Power Meter enters Display and Remote Talk Subroutine hold loop g Line 360 2390 second pass Power Meter outputs com plete data message Verify data message per Read Byte S
163. cription of instrument operation and are keyed to the service sheets containing schematics which follow them NOTE Figure 8 1 Schematic Diagram Notes explains any unusual symbols that appear on the schematics and the switch wafer numbering system 8 3 SAFETY CONSIDERATIONS 8 4 Although this instrument has been designed in accordance with international safety standards this manual contains information cautions and warnings which must be followed to ensure safe operation and to retain the instrument in safe condition see Sections III and V Service and adjustments should be performed only by qualified service personnel WARNING Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal is likely to make the instrument dangerous Intentional interruption is prohibited 8 5 Any adjustment maintenance and repair of the opened instrument under voltage should be avoided as much as possible and when inevitable should be carried out only by a skilled person who is aware of the hazard involved 8 6 Capacitors inside the instrument may still be charged even if the instrument has been dis connected from its source of supply 8 7 Make sure that only fuses with the required rated current and of the specified type normal blow time delay etc are used for replacement 8 1 JCIE VUC py _____ a
164. d borrow respectively allow multidecade counter operations without additional logic The counters are cascaded by feeding the terminal count up output to the count up clock input and terminal count down output to the count down clock input 8 44 The Terminal Count Up outputs of the decade and binary counters are low when their count up clock inputs are low and the counters are in state nine and fifteen respectively Similarly the Terminal Count Down outputs are low when their count down clock inputs are low both counters are in state zero Thus when the decade counter is in state nine and the binary counter is in state fifteen and both are counting up or both are in state zero and counting down a clock pulse will change the counter s state on the rising edge and simultaneously clock the following counter through the appropriate active low terminal count output There are two gate delays per state when these counters are cascaded 8 45 The asynchronous Master Reset R input when high overrides all other inputs and clears the counters Master Reset R overrides Parallel Load C input so that when both are activated the counters will be reset Gate Enable Select Code Model 436A 8 46 Decoder There are two types of decoders used in the Power Meter a 3 line to 8 line and a 4 line to 16 line decoder Operation of both decoders is identical except for the number of input and output lines Therefore only the operatio
165. d to talk and range mode and data output checked Data output should corres pond to minimum threshold of dBm range 3 10 dBm Verify Power Meter mode data and range character output per Read Byte Subroutine starting at line 5000 Data output should correspond to indication on Digital Readout previously verified for local operation C Check that 1 Mode select logic outputs dBm mode 2 Range select logic outputs range 3 3 Range counter is preset to range 3 during Remote Initialize Subroutine Service DOCE M 450A 30 Error Power Meter range or mode output character wrong Description Power Meter programmed to dBm mode range 4 trigger with settling time Then Power Meter addressed to talk and range mode and data output checked Data output should correspond to mini mum threshold of dBm range 4 0 dBm Error Power Meter range mode or data output wrong Description Power Meter programmed to dBm mode range 5 trigger with settling time Then Power Meter addressed to talk and range mode and data output checked Data output should correspond to mini mum threshold of dBm range 5 10 dBm Error Power Meter range mode or data output wrong Description Power Meter programmed to dBm mode auto range trigger with settling time Then Power Meter addressed to talk and range mode and data out
166. d together so that either clock causes the Measurement Rate Select Logic to process the 1101 102 1103 and 04 data bit inputs The 1108 bit selects the measurement rate 8 150 AORA Model 436A Service CIRCUIT DESCRIPTIONS Data Mode Operation cont d delayed or immediate and the remaining three bits select hold triggered or free run operation of the Power Meter 8 144 The 1103 bit is processed separately from the remaining data bit inputs to the Measurement Rate Select Logic When the Function Generator provides a Rate Clock output this bit is clocked into a flip flop If the 1103 bit is high the flip flop is clocked to the set state to select delayed meas urements if the LIOS bit is low the flip flop is clocked to the reset state to select immediate measurements The output of the flip flop is then continuously applied to the Remote Qualifier Multiplexer so that it can be accessed by the operating program This output is then maintained until either a new Measurement Rate Programming Command or an LPU input is received When a new Measurement Rate Programming Command is received the output of the flip flop changes to reflect the current state of the LIOS data bit When an LPU input is received the flip flop is reset along with the Hold and Trigger flip flops and the Power Meter is placed in a hold condition 8 145 The 1102 102 and HI04 data bit inputs are processed to
167. dicates 0 000 0 001 uW If the DATA output exceeds this value the test number is in cremented and the programming com mands and DATA checks are repeated If the DATA output still exceeds 0 000 0 001 uW after ten tries 7716 ERROR 5 is detected NOTE Program execution and circuit operation previously verified by local checkout pro cedure and preceding error chechs except as specified below A Range counter Service Sheet 3 accepts range programming command and outputs range 1 8 103 Service Model 4364 Table 8 4 HP IB Circuit Troubleshooting 6 of 18 Error Power Meter status output does not indicate auto zeroing range 1 Description The Power Meter was pro grammed to auto zero on range 1 for the previous test For this test the Power Meter is programmed to the Watt Mode and a measurement is triggered Then the Power Meter output status is checked to ensure that the auto zero timer circuit Service Sheet 10 holds the Power Meter in an auto zero loop for a period of ap proximately four seconds after the auto zero function is terminated Error Power Meter status output does not indicate measured value valid Description For this test the Power Meter was programmed to the Watt Mode and a measurement was triggered 10 sec onds were allowed for the auto zero loop to clear then the Power Meter was ad dressed to talk and the output status character was checked Sin
168. dure Test M and Key Operating Sequence DESCRIPTION This step verifies the up down counting of the main counter when a positive dBm reference value is stored KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below a When RANGE switch is set to 10 dBm main counter is counted down to obtain specified indication When RANGE switch is set to 5 dBm main counter is counted up to obtain specified indication DESCRIPTION This step verifies the down up counting of the main counter when a positive dBm reference value is stored and a slightly less positive input power level is applied KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for down up counting of main counter sign changes when main counter goes through 0 000 refer to Service Sheet DESCRIPTION This step verifies that dB Relative Subroutine address branching is proper for a dB REL MODE OVER RANGE condition KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for addresses 047 YM2 0 and 050 1 1 of Over Under Range Continue Subroutine DESCRIPTION This step verifies that the reference register is cleared when the dB REF switch is pressed while an OVER RANGE condition exists KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for address 050 YM1 0 of Over Und
169. during Remote Initialize Subroutine Error Power Meter range or mode output character wrong Turn Power Meter on and off then manually program Power Meter to Watt Mode range 2 trigger with settling time CMD 20 B Verify Power Meter mode and range character output per Read Byte Subroutines starting at line 5000 Description Power Meter programmed to Watt Mode range 2 trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked C Check that 1 Mode select logic outputs Watt Mode 2 Range select logic outputs range 2 3 Range counter is preset to range 2 during Remote Initialize Subroutine Error Power Meter range or mode out put character wrong Manually program Power Meter to Watt Mode range 3 trigger with settling time CMD 21 Description Power Meter programmed to Watt Mode range 3 trigger with settling time Then Power Meter addressed to talk and range and mode output characters checked Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 C Check that 1 Mode select logic outputs Watt Mode 2 Range select logic outputs range 3 3 Range counter is preset to range 3 during Remote Initialize Subroutine 4 Operating program branches from address 030g to address 056 Remote
170. e Controller and the Main Counter operating cycle associated with the measurement function is the same as described before for the Auto Zero Func tion except that an LINP instruction is generated in heu of an LAZ instruction The LINP instruc tion enables the LRIN output of the A D Control Register This output is then maintained for 33 82 mS Main Counter is counted up to 2000 to allow the A D ramp to charge to 7 times the dc input volage 8 103 A D Converter Linear Conversion An A D converter linear conversion is enabled following the measurement function when the Power Meter is configured for WATT MODE operation The Con troller and Main Counter operating cycle associated with a linear conversion is described in the follow ing paragraph a The Controller checks the A D Converter qualifier to ascertain whether it represents a posi tive or negative input power level A negative power level indicates a high noise condition at the input to the Power Sensor If it represents a negative power level an LPSC instruction is gener ated to load the True Range Counter and Sign Preset inputs into the Main Counter and Sign Latch respectively For WATT MODE operation these inputs are such that the output of the Main Counter remains at 0000 and the output of the Sign Latch changes to indicate a negative sign Model 436A Service Table 8 7 Up Down Count Control Logic Steering Inputs to Up Down Count Control Logic LCNT LREL ue YSPL N
171. e or Local Remote Branch subroutine and to end at the Display and Remote Talk Subroutine When auto ranging is enabled and out of range measurement is obtained a measurement sub loop is enabled to prevent completion of the program 436 Service CIRCUIT DESCRIPTIONS Er PES EEPMPHM Service Sheet 3 cont d cycle until an in range measurement is obtained on any range or an out of range measurement is obtained on the last range When local operation is selected the program is allowed to free run and measurements are taken asynchronously to changes in the RF input power level When remote opera tion is selected an additional capability is provided to enable the start of each program cycle to be triggered by an external input Thus for remote operation measurements can be taken synchron ously or asynchronously to changes in the input power level 8 96 Mode Selection The Mode Select inputs are applied to the Controller in a WIRED OR configuration to enable either Local or Remote mode selection When the Power Meter is configured for Local Operation the Remote Enable input to the Pushbutton Switch Assembly is high and the Mode Select outputs of the Remote Interface Circuits are set to the logic 1 5V state Thus the Pushbutton Switch Assembly is enabled to select the operating mode for the Power Meter When the Power Meter is configured for rem
172. e range qualifiers should be set to the following logic states YR3 2 L YRI H 7 If a display is present the logic analyzer it verifies that the operating program is cycling normally and branching to address 0525 to initiate each cycle With this fact established its just a matter of signal tracing to find out exactly where the problem is Refer to Service Sheet 3 and check the outputs of the Mode Register and Range Counter If they re normal trace out the signal lines to the Display Assembly to isolate the problem to a circuit If the outputs of the Mode Register are abnormal use the logic analyzer and an oscilloscope to isolate the problem to the ROM containing the program the Instruction Register the Front Panel Switches the Buffers or the Mode Register and Gates Service Sheet 3 If the outputs of the Range Counter are abnormal turn power on and off while using the logic analyzer to check program execution and Range Counter operation during the Power Up Subroutine 8 If no display is present on the logic analyzer turn power on and off as required to verify program execution starting at address 0005 of the Power Up Subroutine c If the mode and range indications are normal check the output of the Amplifier Demodulator and Filter circuits at DC test point If it is abnormal refer to Service Sheet 2 and check the YLOG and range select inputs to the circuit If the YLOG and Range Select inp
173. e sent to the Power Meter to ensure that it will not erroneously de code these characters as a device clear command After the last character is GO TO line 1150 and use STEP key to manually execute test program line by line Check LPU output of device clear decoder Service Sheet 11 for each ASCII character sent 8 112 1 ADGA Model 436A Service Tahle 8 4 HP IB Cireuit Troubleshooting 15 of 18 m Problem and Description Corrective Action 34 sent the Power Meter is programmed to trigger immediate talk and the mode out put is checked to ensure that the Power Meter is still operating in the dBm mode 35 Error Power Meter doesn t go into hold after receiving device clear Description device clear is sent to the Power Meter to select watt mode auto range operation Then 200 ms delay is provided after which the Power Meter is programmed to the dBm mode range 3 trigger immediate Following these pro gramming commands a talk cycle is en and the calculator checks Power The purpose of this test is to verify that the device clear command causes the Power Meter to enter a hold condition while awaiting a trigger command If the device clear doesn t cause the Power Meter to enter the hold loop the talk cycle will be enabled before the programming commands are loaded into the mode register and range counter Thus the Power Meter will output the mode range and statu
174. each lower numbered position The switch is normally set to the position specified on the Power sensor s CAL FACTOR curve When the switch is set properly the output of the DC Amplifier in millivolts indicates the numeric value of the RF input power level The decimal point and multi plier are provided by the True Range Decoder 8 77 Auto Zero Assembly Assembly s function is to remove any dc offset voltage associated with the Power Sensor When the front panel SENSOR ZERO switch is pressed the Controller activates the Sensor Auto Zero En able input for a period of approximately four seconds While this input is active a feedback loop is configured between the Auto Zero Assembly and the Power Sensor to allow a capacitor in the Auto Zero circuit to charge to a value that cancels the dc offset of the Power Sensor Loop stability is achieved when the Mount Auto Zero output of the Auto Zero Assembly holds the dc level at 4 DC at 0 000 0 002V After the Sensor Auto Zero Enable input is terminated the feedback loop is broken and the capacitor is held at the charged value Thus the Mount Auto Zero output continues to cancel the dc offset of the Power Sensor thereby allowing accurate measurement of RF input power levels 8 78 Analog to Digital Converter Analog to Digital Converter Figure 8 18 operates together with the Counters see Service Sheet 3 to convert the dc output of the Amplifi
175. ect in range condition Over Range Sub Table 8 3 Step i address 131 or 133 if routine address 147 40 i A D converter output if 1200 counts i qualifier changes between cont d 100 and 1199 counts Detect over range condi tion address 134 if A D converter output quali fier does not change state before 1200 counts Clear over under range decoder LCOR 2 8 Log NOTE A D Converter Conversion For log dB conversion the Log Conversion main counter can be preset to a negative number and counted down or it can be preset to a positive number and counted up In addition if the output of the main counter reaches 0000 when it is being counted down a borrow pulse is generated to change the direction of counting The count decod ing of this subroutine is such that an in range measure ment is detected whenever the A D converter output qualifier changes state be fore 1100 clocks are applied to the main counter regard less of the direction of counting a Enable log conversion Table 8 3 Step ramp LRMP and count 25 address 135 main counter up or down on every other clock pulse LCNT Check A D converter out dB Relative Sub Table 8 3 Step put qualifier prior to each routine address 170 26 address 135 count to detect in range if 1100 counts 136 137 150 or over range condition 151 152 Detect in range condition Over range sub Step 27 address address 135 137 151 rou
176. eet 1 To isolate the fault proceed as follows a Look at the front panel display while referrring to Figure 8 14 and try to determine what portion of the operating program that the fault is associated with Note that the range and mode indications are generated at the start of the pro gram cycle the in range out of range status indica tions are generated next then the digital readout is updated at the end of the program cycle When autoranging is enabled and an out of range con version is detected additional measurements are taken until an in range conversion is detected or until an out of range conversion is detected on the last range Thus the digital readout is not updated until after the last conversion of the program cycle b the mode and range indications are abnormal the fault occurs early in the program cycle and will affect circuit operation for the remainder of the cycle Thus the abnormal indica tion should be remedied before attempting any further analysis of Power Meter operation To isolate the fault proceed as follows 1 Connect the logic analyzer HP 1600A or equivalent to the Power Meter as follows NOTE Unless otherwise indicated the logie analyzer is always connected nA _ 436 POWERON INITIALIZE POWER METER CIRCUITS NOTE 1 REMOTE LOCAL RANGE SELECTION Pete LOCAL SELECTION A WEASUREMENT S m TRIGGERED A D CO
177. elow Model 436A service n Tahle 8 3 Standard Instrument Checkout 4 of 17 P Instrument Setup and Test Procedure Turn Power Meter CAL ADJ control counterclockwise until OVER RANGE lamp goes out and indication appears on Digital Readout Test Description and Key Operating Sequence DESCRIPTION This step verifies that the Power Meter is capable of detecting the end of an over range condition and resetting the front panel display accordingly KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below Over Range Subroutine Branch to Over Under Range Continue Subroutine when over range condition exists Over Under Range Continue Subroutine Branch to Display and Remote Talk Subroutine when over range condition exists Measurement Subroutine A D Converter input voltage at DC test point ASTP4 de creases to less than 1 200V Ramp amplitude at RMP test point 2 decreases to less than 8 5 Vp p Linear Positive Conversion Subroutine Detect YPLS 0 at address 074 reset OVER RANGE indi eation and clear blanked display Set CAL FACTOR switch to 100 and turn Power Meter CAL ADJ control counterclockwise until Digital Readout indicates 99 0 mW Then set Range Calibrator RANGE switch to 10 mW and verify that Digital Readout indi ca
178. ensor to estab lish the proper reference conditions for the next step Set Range Calibrator RANGE switch to 3uW and FUNCTION switch to CALIBRATE Verify that an UNDER RANGE indication is observed then release Power Meter RANGE HOLD switch and verify that Power Meter auto ranges to range 1 according to the fol lowing sequence uW lamp remains lit b Digital Readout blanks momentarily and UNDER RANGE lamp lights momentarily decimal point moves one position to left while Digital Readout is blanked c Digital Readout indication changes from blanked to 3 16 1 0 mW DESCRIPTION This step verifies the capability of the Power Meter to auto range from range 2 to range 1 and to properly display arange 1 30 input power level KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below a A D Converter input voltage at DC test point 4 is 0 032 0 01V when RANGE HOLD switch is set to on in b Range counter is counted down to range 1 during Under Range Subroutine when RANGE HOLD switch is set to off c Program branches from Local Initialize Subroutine address 054 to Zero Subroutine d A D Converter input voltage at DC test point rises to 0 316 0 01V within ten seconds after range counter is counted down to range 1 8 59 Model 436A Table 8 3 Standard Instrument Checkout 9 of 17 Step Instrument Setup and Test P
179. er b Slide top cover back until free from front frame and lift off Reverse the procedure to replace the top cover 8 22 Bottom Cover Removal To remove the bottom cover from the Power Meter follow the steps as listed below a Place Power Meter with bottom cover facing up b Remove four plastic feet from bottom cover Lift up on back edge of plastic foot and P Q W1P2 P O W2P2 81 push back on front edge of plastic foot to free foot from bottom cover Remove captive Pozidriv screw from rear edge of bottom cover d Slide bottom cover back until it clears rear frame Reverse the procedure to replace the bottom cover 8 23 Front Panel Removal To remove the front panel from the Power Meter follow the steps as listed below a Remove top and bottom covers b Remove side trim strips from front frame c Remove two Pozidriv screws from both sides of front frame d Carefully push front panel from behind to free it from the front frame see Figure 8 2 P O W4P2 OR W11P2 OPT 022 0 W3P2 3816 Figure 8 2 Front Panel Removal Model 436A Disassembly and Reassembly Procedures cont d e Disconnect cables as necessary for access to front panel assemblies and components Reverse the procedure to replace the front panel 8 24 BASIC CIRCUIT DESCRIPTIONS 8 25 Linear Integrated Circuits 8 26 O
180. er Demodula tor and Filter Circuits to a four digit BCD number which indicates the numeric value of the RF input power level applied to the Power Sensor Operation of the A D Converter can be divided into three basic functions auto zero function measurement funetion and conversion function As shown in Figure 8 15 Sheet 1 a subroutine is dedicated to each of these functions and the functions are performed in sequence during every program cycle Additional auto zero functions may be enabled at other times in the program cycle if various pre determined operating conditions are detected During the auto zero subroutine a feedback loop is closed to remove any dc offset voltage present at the reference input of the Ramp Generator During the measurement subroutine the Ramp Generator is charged to 7 times the dc input value During the conversion subroutine the Ramp Generator is discharged at a linear or expo nential rate and the Counters are clocked to measure the time that it takes for the Ramp Generator to discharge through threshold 8 79 A D Converter Auto Zero Function The auto zero function is enabled when the Controller activates the AUTO ZERO ENABLE input to the A D Converter During the Auto Zero subroutine this input is maintained for 133 ms the Controller enables the main Counter when the input is acti vated and terminates the input when the count reaches 8000 For auto zero functions generated at other poi
181. er Meter programmed to dB REF mode range 4 trigger with set tling time Then Power Meter addressed to talk and range and mode output charac ters checked Error Power Meter range or mode output character wrong Description Power Meter programmed to dB REF mode range 5 trigger with settling time Then Power Meter addressed to talk and range and mode output charac ters checked Error Power Meter range or mode output characters wrong Description Power Meter programmed to dB REF mode auto range trigger with settling time Then Power Meter addressed to talk and range and mode output charac ters checked Manually program Power Meter to dB REF mode range 3 trigger with settling time CMD U Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logie outputs dB REF mode 2 Range select logic outputs range 3 3 Range counter is preset to range 3 during Remote Initialize Subroutine Manually program Power meter to dB REF mode range 4 trigger with settling time CMD U Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs dB REF mode 2 Range select logic outputs range 4 3 Range counter is preset to range 4 during Remote Initialize Subroutine Manually program Power Meter
182. er Range Continue Subroutine Model 436A Service Table 8 3 Standard instrument Checkout 16 of 17 Set Range Calibrator RANGE switch to 5 dBm and adjust Power Meter CAL ADJ control to obtain 5 00 indication on Digi tal Readout Then set Power Meter MODE WATT switch to on and Range Calibrator POLARITY switch to REVERSE Verify that Power Meter Digital Readout indi cates 3 16 6 3 mW Set Power Meter RANGE HOLD switch to on in and Range Calibrator RANGE switch to 10 mW Verity that Digital Read out indicates 10 2 mW and record indication instrument Setup and Test Procedure Test Description and Key Operating Sequence DESCRIPTION Negative Watt readaut capability is provided to enable detection of high noise conditions This step verifies that capability of the Power Meter to detect and indicate 28 nega tive power level negative WATT MODE measurement simulates high noise condition at the input of the Power Sensor KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below Measurement Subroutine A D Converter input voltage at DC test point 4 0 316 0 002V Preset counter and branch to Linear Negative Conversion Subroutine reference previously verified Linear Negative Conversion Subroutine Initiate Linear Negative Conversion Ramp and count main counter up Detect YPLS 0 at address 131 633 126 clock pulses from address 07
183. er generates an LTC instruction to transfer the output of the Sign Latch to the front panel Sign Indicator via the Display Sign Latch to load the output of the Main Counter into the Display Register and to indicate to the Remote Interface Circuits that the measurement is completed 8 114 Service Sheet 4 8 115 General The Hewlett Packard Interface Bus circuits Option 022 add talker listener capability to the Power Meter When the listener function is selected the Power Meter accepts pro gramming inputs asynchronously to the operating program and stores the data so that it can be accessed during each program cycle When the talker function is selected the Power Meter out puts measurement and status data in a bit parallel word serial format during the display and remote talk subroutine 8 116 The descriptions which follow assume a basic understanding of Hewlett Packard Interface Bus HP IB operation For additional information 8 144 covering HP IB operation refer to Hewlett Packard Interface Bus Users Guide HP Part No 59300 90001 for HP 9820 and 59300 90002 for HP 9830 and Condensed Description of the Hewlett Packard Interface Bus HP Part No 59401 90030 8 117 Command Mode Operation 8 118 The HP IB circuits are placed in the com mand mode when the Remote Interface Controller sets the comand mode enable ATN line low this mode the HP IB circuits will respond to a listen address a talk add
184. er is automatically configured for dB REL operation on the next program cycle The Power Meter will then remain configured for dB REL operation until WATT dBm operation is subse quently selected 8 112 When the Mode Qualifier Bits indicate that the dB REF mode is selected an LLRE instruc tion is generated after an in range log conversion to load the outputs of the Main Counter and the Sign Latch into the Reference Register Power Meter accuracy specifications apply to in range measure ments If the dB REF mode is selected and out of range log conversion is detected an LCLR instruction is generated prior to the LLRE instruc tion to set the output of the Main Counter to 0000 and to store a positive sign in the Sign Latch Thus the Reference Register is effectively cleared to prevent an inaccurate reference from being used as the basis of future dB REL indications After the measured value is stored in the Reference Register a dB REL conversion is enabled to indicate the measured value with respect to the stored reference At the end of this conversion the output of the Main Counter will be 0000 because the measured value and the reference value were equal at the start of the conversion The Controller then continues to enable one log and one dB REF dB REL conversion per program cycle until the dB REF switch is released and the Mode Qualifier Bits change to indicate that the dB REL Mode is ena
185. er range A D routine Address Log Conversion ramp input slope does not 174 if dc input exceed log threshold under range b Light UNDER RANGE lamp LSUR and blank display LSOR if de input under range Log Conversion Sub Table 8 3 Step 25 routine Address 136 if de input not unde range 8 127 Service Model 436A Table 8 6 Operating Program Description 5 of 11 Block Diagram Description Sub Routine Address Function Branch To Title Sheet Measurement 3 Enable A D ramp log Subroutine conversion slope LRMP cont d if de input not under range Under Range Sub A D Converter Linear Conversion Linear Positive Conversion Subroutine Enable linear positive conversion ramp LRMP and count main counter on every other clock pulse LCNT Check A D converter out put qualifier prior to each count to detect under range in range or over range condition Table 8 3 Step 7 Table 8 3 Step 1 addresses 071 067 072 073 Step 3 addresses 074 075 Step 6 address 074 LCOR instruction Display and Remote Talk Subroutine Address 177 if be tween 100 and 1199 counts Detect under range ad dress 067 if A D conver ter output qualifier changes state before main counter is counted up 100 counts Detect in range condition address 072 or 074
186. er with set tling time Then Power Meter addressed to talk and range and mode output charac ters checked 20 Error Power Meter range or mode output character wrong Description Power Meter programmed to dB REL mode auto range trigger with settling time Then Power Meter addressed to talk and range and mode output charac ters checked 21 Error Power Meter range or mode output character wrong Description Power Meter programmed to dB REF mode range 1 trigger with set tling time Then Power Meter addressed talk and range and mode output charac ters checked 22 Error Power Meter range or mode output character wrong Description Power Meter programmed to dB REF mode range 2 trigger with set tling time Then Power Meter addressed to talk and range and mode output charac ters checked 8 108 Manually program Power Meter to dB REL mode range 5 trigger with settling time CMD U B5T Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic output dB REL mode 2 Range select logic output range 5 3 Range counter is preset to range 5 during Remote Initialize Subroutine Manually program Power Meter to dB REL mode auto range trigger with settling time CMD U 9 Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 500
187. es is active the LLGR output is enabled to select the log threshold whenever the A D Converter is not being auto zeroed If the A D qualifier input is indicating that the ramp has not charged through threshold the Controller deteets an under range conversion Registration of the under range conversion is described below c If the A D qualifier is 5V indicating that the ramp has charged through threshold the Con troller alternately monitors the count and A D qualifier inputs while generating an LRMP instruction on the negative alternation of each 01 clock pulse and an LCNT instruction on the nega tive alternation of every other 01 clock pulse The LCNT instructions are processed by the Up Down Count Control Logic as indicated in Table 8 7 to provide up or down clock outputs to the Main Counter The LRMP instructions are clocked into the A D Control Register by the HPLS 2 clock thereby providing a continuous ramp enable output to the A D Control Gates Since the YLOG input to A D Control Gates is also active the gates provide a continuous LRL output along with the LLGR output to enable the log conversion slope of the A D ramp d continuous LRL output causes the A D ramp to be discharged at an exponential rate If the ramp discharges through threshold in less than 1100 counts an in range conversion is de tected If the ramp does not reach threshold by 1100 counts an over range conversion is detected Registr
188. esent at the data input when the transition occurred is retained at the outputs until the clock returns high Figure 8 5 Four Bit Latch 8 36 Dual J K Master Slave Flip Flop The dual J K Master Slave Flip Flop shown in Figure 8 6 consists of two independent J K flip flops Inputs to the master section is controlled by the gate G 8 9 service Digital Integrated Circuits and Symbols cont d pulse The gate pulse also controls the state of the coupling transistors which connect the master and slave sections The sequence of operation is as follows a 1 Isolate slave from master b T2 Enter information from J and K inputs to master c Disable J and K inputs d 4 Transfer information from master to slave 8 37 Flip flop response is determined by the levels present at the J and K inputs at time T2 The four possible combinations are as follows When J and are low the outputs wil not change state b When is high and K is low the active high output will go high unless it is already high c When J is low and is high the active high output wil go low unless it is already low d When J and K are both high the flip flop will toggle That is the active high and active low outputs will change states for each gate pulse 8 88 The set S and reset R inputs override all other input conditions when set S is low the active high output is forced high w
189. f approxi mately 33 3 ms ramp does not reach 7 0 volts with 1 0 at DC check that LRIN instruction pin 24 is pulsed low for 33 3 ms to turn transistors 3611 A3Q12 off and FET A3Q13 on Check that ramp at A3TP2 de creases from 7 volts to 0 volts at a linear rate Check VR at collector of A3Q17 approximately 6 2 Vde and VR at A3UBB pin 7 approximately 6 2 Vde The LRP instruction on XA8 pin 25 is pulsed low in the Watt Mode to turn transistors 801 and A3Q6 off and FET A8Q16 on causing a positive linear ramp to be generated The LRM instruction on XA8 pin 26 is pulsed low in the Watt Mode to turn transistors A3Q2 and off and FET 3015 on causing a negative linear ramp to be generated LRM and LRP instructions remain high when dBm dB REF or dB REL Modes are selected Set Power Meter to dBm Mode and apply a 1 0 mW input signal to Power Sensor Check that ramp at decreases from 7 0 volts to threshold ref erence level at a log rate Check that LLGR and LRL instructions on XA3 pins 3 and 4 respectively are pulsed low dBm dB REF and dB REL Modes The LRL instruction turns transistors A8Q4 and A3Q9 off and FET A3Q19 on applying the LOG REF Threshold signal to A8U2 pin The output of pin 6 must discharge past this level before the voltage at YPLS can switch to 0 volts LLGR and LRL instructions remain high in the
190. f the operating program is illustrated in Figure 8 15 Sheet 1 As shown in the figure the operating program is divided into subroutines with each subroutine providing some dedicated func tion When the Power Meter is first turned on the operating program is preset to its power up address and the power up subroutine is executed to initialize the Power Meter circuits After the power up subroutine is executed the program cycles normally with one measurement being taken and the results displayed for each cycle During each cycle the circuits shown on the block diagram operate as described in the following paragraphs a Power Sensor Amplifier Demodulator Filter and True Range Decoder The inputs to these circuits from the Controller are allowed to change only once during each program cycle Thus the circuits are in effect continuously enabled and provide constant outputs The outputs of the Amplifier Filter and Demodulator Circuits are representations of the RF input power level applied to the Power Sensor The outputs of the True Range Decoder are reference values which account for the different sensitivities of the various types of Power Sensors that can be used with the Power Meter b Counters Clock Generator and Analog to Digital Converter The Clock Generator provides program clock outputs which enable sequencing of the operating program and counting of the Up Down Counters The Counters are en abled by the Contro
191. fication Program HP 9830 Calculator 20 of 25 8 89 Arcor WAS 1870 ASSIGNMENT test number incremented 2 301 1880 IF THEN YES Subroutine print ERROR 40 stop GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits DISPLAY data 866 mW Received YES 1920 PRINT text in quotes 1930 PRINT skip line 1940 BUS CMD unlisten 1950 1960 PRINT text in quotes 1970 1980 PRINT skip line 1990 STOP 5 Figure 8 16 HP IB Verification Program HP 9830A Calculator 21 of 25 8 90 Model ARAA 436A Service Perform operations specified in printed text then press CONT amp EXECUTE keys to manually re start program MANUAL RESTART BUS CMD Power Meter addressed to listen CAL FACTOR switch enabled GO 508 RETURN device clear output to Power Meter ASSIGNMENT error number set to 41 BUS CMD Power Meter addressed to listen and programmed to trigger with settling time GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 2050 IF THEN 1 000 0 003 mW Received NO YES 2070 GO SUB print ERROR 41 stop 2060 GO TO
192. for off page connection Number only on page connection Figure 8 1 Schematic Diagram Notes 1 of 3 AIRA 436 pe am OFF EXAMPLE A3S1AR 2 1 2 351 2 1 2 if SWITCH 51 WITHIN ASSEMBLY A3 1ST WAFER FROM FRONT 15 ETC REAR OF WAFER F FRONT TERMINAL LOCATION 2 1 2 VIEWED FROM service SCHEMATIC DIAGRAM NOTES Indicates multiple paths represented by only one line Letters or names identify individual paths Numbers indicate number of paths represented by the line Coaxial or shielded cable Relay contact moves in direction of arrow when energized OI 7 SIA 518 SiC Vacca OT d f GFF zb d OFF ON o o 0 O 0N O0 Indicates interlocked pushbutton switches with one momentary switch section Only one switch section can be ON at a time Depressing one switch section releases any other switch section Indicates a pushbutton switch with a momentary ON position SWITCH DESIGNATIONS Figure 8 1 Schematic Diagram Notes 2 of 3 8 3 450A Test point symbols Stars are numbered or lettered for easy correlation Interconnection information of schematic diagrams procedures and locator illustrations Circled letter indicates circuit Arrow connecting star to meas Star shown connected to path continues on another ure
193. gether to select hold free run or triggered operation of the Power Meter When the Function Decoder provides a Rate Clock output the 102 bit is clocked directly into a flip flop and the 1101 and HI04 bits are NANDed together with the resultant output clocked into a second flip flop For purposes of definition the flip flop which accepts the 02 bit is called the Hold Flip Flop and the flip flop which accepts the gated input is called the Trigger Flip Flop When the 09 bit is high the Hold Flip Flop is clocked to the set state to enable free run operation of the Power Meter When the 102 bit is low the Hold Flip Flop is clocked to the reset state to enable hold or triggered operation of the Power Meter The way this is accomplished is by ORing the outputs of the Hold and Trigger Flip Flops When the Hold Flip Flop is set the OR gate is contin uously enabled and provides a low H HOLD output to the Remote Multiplexer When the Hold Flip Flop is reset the state of the Trigger Flip Flop controls the H HOLD output of the OR gate Operation of the Trigger Flip Flop for a Hold or Triggered Measurement Programming Command is described in the following paragraphs a When both the 1101 and HI04 data bits are high for a Hold Programming Command the Trigger Flip Flop is reset by the Rate Clock output of the Function Decoder Since the Hold Flip Flop is also reset the OR gate is disabled and a high H HOLD output is provided to the
194. gramming command and operating program cycles to Display and Remote Talk Subroutine hold loop c Line 1340 2380 Power Meter outputs connect status range and mode characters Power Meter output can be verified per Read Byte Subroutine starting at line 5000 GO TO line 1410 and use STEP key to manually execute pro gram line by line Check that Power Meter is unaddressed to listen in line 1430 and is not addressed to listen in line 1440 LSTN test point 11 4 remains low If Power Meter is addressed to listen in line 1440 use the following program to isolate malfunction CMD MS H LSTN test point goes low CMD U H LSTN test point goes high CMD MS HLSTN test point goes low CMD 20 LSTN test point remains low CMD UP H LSTN test point remains low CMD 70 H LSTN test point remains low CMD U LSTN test point remains low CMD U H LSTN test point remains low NOTE Address 1028 Q 0 of Remote Initialize Subroutine has not been previously verified To verify this address turn power on and off to Power Meter set front panel MODE switch to dBm then manually program Power Meter to remote mode and then to watt mode range 3 trigger immediate CMD U CMD U and check that the following indications are obtained 8 113 service Model 436A
195. he 8 1 Assembly is isolated and repaired the correct output level 1 mW 0 7 must be set by a very accurate power measurement system Hewlett Packard employs a special system 8 186 Model 436A accurate to 20 59 and traceable to the National Bureau of Standards When setting the power level a transfer error of 0 2 is introducted making the total error 0 7 If a system this accurate is available it may be used to set the proper output level Otherwise Hewlett Packard recommends returning the Power Meter so it can be reset at the factory Contact your nearest Hewlett Packard office for more information 50 MHz Oscillator Malfunctions of the oscillator circuit will occur as a wrong output frequency or as an abnormal output level The voltage at TP2 will indicate if the ALC loop is trying to compensate for an incorrect output level Modulation of the 50 MHz signal or spurious signals which are part of the output may be caused by defects in R9 R10 R11 or C8 in the ALC loop ALC Loop and Power Supply Isolating problems in the ALC Loop and Power Supply circuits may be quickly isolated by measur ing de voltages at the inputs and outputs of the integrated circuits pre ay eq ueo 1910 Luy eq 3snui 77 992 914 nor JO ei serddns 10
196. he LPU signal generated by the Controller when the Power Meter is first turned on and by the Device Clear Generator when a Device Clear Command is detected This input is applied to the Remote Enable Logic in a WIRED configur ation and an RC network is used to discriminate between the signal sources When the Power Meter is first turned on the LPU output of the Controller is mainatined for approximately 500 ms thereby allowing the RC network to discharge to OV and reset the Remote Enable Logic When a Device Clear Command is detected the LPU output of the Device Clear Generator is equal in width to the HCLK input and does not discharge the RC net work Thus when the Power Meter is first turned on it is automatically configured for local opera tion If remote operation is subsequently selected the Power Meter will remain configured for remote operation until the Remote Enable REN input is set false to terminate remote operation of all instruments on the HP Interface Bus 8 125 Device Clear When a Device Clear Code is placed on the data lines the Device Clear Generator is enabled and provides an LPU otuput in response to the HCLK input shown on the block diagram this output is tied to the LPU Model 436A Service CIRCUIT DESCRIPTIONS Service Sheet 4 cont d output of the Controller in a WIRED OR config uration The pulse width of the Device Clear Decoder output however is much narro
197. he Main Counter is counted up from 0000 on 8 119 VILU 8 120 nA ENABLE POSITIVE SLOPE GENERATOR CONTROL FROM ROM CONTROLLER FROM AMPLIFIER DEMODULATOR AND FILTER CIRCUIT VOLTS LOG THRESHOLD 9 5 0 71 10 VOLTS LITANI NAWA ENABLE LOG RAMP 106 CONVERSION LINEAR RAMP LINEAR POSITIVE amp SWITCH ENABLE NEGATIVE CONVERSION SLOPE LINEAR RAMP GENERATOR amp SWITCH LOAD DC INPUT RAMP LINEAR NEGATIVE GENERATOR CONVERSION SLOPE GENERATOR amp SWITCH DC INPUT SWITCH ENABLE LOG REFERENCE A D CONVERTER OUTPUT 106 THRESHOLD A A D CONVERTER FUNCTIONAL BLOCK DIAGRAM 06 iNPUT AUTO ZERO ENABLE 8 LINEAR POSITIVE CONVERSION WAVEFORMS CONVERSION SLOPE NOTE Linear positive conversion ramp is shown Negative conversion ramp slopes are similar but polarity is reversed 8 200 400 800 800 1000 1200 1400 1600 1800 0000 200 400 600 809 1000 1200 1400 1600 1800 2000 2200 2400 CLOCK PULSES C LOG CONVERSION WAVEFORMS tb 5 5 CONVERSION SLOPE Q0 200 400 600 800 1000 1200 1400 1500 1800 0000 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 CLOCK PULSES Figure 8 18 Analog to Digital Converter Simplified Diagram and Waveforms Madel AZAA Model 436A service CIRCUIT DESCRIPTIONS Service Sheet 2 cont d every other clock pulse Thus the Main Counter i
198. hen RANGE switch is set to 5 dBm main counter is counted up to obtain specified indication c When RANGE switch is set to 5 dBm and CAL ADJ control is adjusted for 1 00 dBm indication main counter is first counted down to 0000 then up to 0100 to obtain indication sign changes when main counter goes through 0 8 65 436 Table 8 3 Standard Instrument Checkout 15 of 17 Set Range Calibrator RANGE switch to 5 dBm Press dB REF MODE switch and observe indication on Digital Readout change to 0 00 dBm Then set Range Calibrator RANGE switch in turn to 10 and 5 dBm and verity that Digital Readout indication changes to 5 00 0 02 and 10 00 0 02 dBm respectively Set Range Calibrator RANGE switch to o dBm and adjust CAL ADJ control to obtain 1 00 dBm indication on Digital Readout Set Range Calibrator RANGE switch to 20 dBm press dB REF switch and ob serve that Digital Readout indication changes 0 00 Then turn CAL ADJ control clock wise to obtain OVER RANGE blanked indi cation and counterclockwise to clear OVER RANGE indication Verify that when OVER RANGE indication is cleared new indication on Digital Readout is with re spect to stored reference of 20 00 dBm Repeat step 35 except press dB REF switch when OVER RANGE indication is present Verify that when OVER RANGE indication is cleared new indication is greater than 20 00 dBm Instrument Setup and Test Proce
199. hen reset R is low the active high output is forced low Although normally the active low output is the complement of the active high output simultaneous low inputs to both S and R will force both outputs high on some J K flip flops This forced high on both outputs will exist only for as long as both R and S are held low The flip flop will return to some indeterminate state when both R and 5 go high Figure 8 6 Dual J K Master Slave Flip Flop and Gate Pulse Timing 8 10 4504 8 39 Dual J K Edge Triggered Flip Flop The dual J K edge triggered flip flop shown in Figure 8 7 is functionally identical to the master slave flip flop described previously except for gate pulse timing The edge triggered flip flop response is determined by the levels present at the J and K inputs at the instant that a negative gate transition high to low occurs Figure 8 7 Dual J K Edge Triggered Flip Flop 8 40 Programmable Counters Programmable binary and decade counters used in the Power Meter are shown in Figure 8 8 The operating modes for both counters are identical The only differences in operation are in the count sequences 8 41 Operation of the counters is synchronous with the outputs changing state after the high to low transistion of either the Count Up Clock 1 or the Count Down Clock 1 The direction of counting is determined by which clock input is pulsed while the other clock is high Incorrect counting wi
200. here can be up to five listeners If any other listen address than that assigned to the Power Meter is placed on the HP IB data bits 1 through 5 disable both the Address Decoder and the Unlisten output of the Listen Unlisten Decoder Thus even though data bits 6 and 7 enable the Listen Clock output of the Listen Unlisten decoder absence of the Address Enable and Unlisten inputs inhibits the Listen Register from changing state 8 130 Data Mode Operation 8 131 The HP IB circuits are placed in the data mode when the Remote Interface Controller sets the Command Mode Enable ATN line to high In this mode the HP IB circuits can function either as a talker or a listener If remote operation of the Power Meter is enabled and the circuits were previously addressed to listen they accept and decode programming inputs received over the HP IB and store the data to control Power Meter operation If remote operation of the Power Meter is enabled and the circuits were previously addressed to talk they provide measurement and status outputs in a bit parallel word serial format during the operating program Display and Remote Talk Subroutine 8 132 Listen Handshake Timing When the HP IB is in the data mode and the HP IB circuits are addressed to listen the handshake timing outputs necessary to complete each Remote Interface Controller initiated data transfer cycle generated as described above for the command mode 8 147
201. high thereby termi nating the Data Accept Clock a short time later With the Data Accept Clock terminated the NRFD output of the Listen Transfer Control Gates is set high ready for data and the Data Accept line is reset low to enable the next data transfer initiated by the Remote Interface Controller ASD 436 Service DAV LCLK p DATA ACCEPT CLOCK D NOTES 1 The HCLK output of the clock generator is enabled only during the com mand mode the LCLK and data accept clocks are enabled in both the command and data modes 2 The listen transfer control gates process the data accept clock to generate the NRFD and NDAC handshake signals in the command mode and when the Power Meter is addressed to listen the data mode also if the Power Meter is not addressed to Listen in the data mode both signals are set high so that they do not affect HP IB operation Figure 8 19 Listen Handshake Timing 8 145 service Model 4364 CIRCUIT DESCRIPTIONS Service Sheet 4 cont d 8 120 Talker and Listener Addressing Factory installed jumpers select talk address and listen address for the Power Meter Instructions for reconnecting the Jumpers to change the talk and listen addresses are provided in Section Installa tion In Table 2 2 it is shown that the binary code for both of these addresses is the same except for data bits 6 and 7
202. if A D converter output qualifier changes state between 100 and 1199 counts Detect over range condi tion address 075 if A D converter output qualifier does not change state before 1200 counts Clear over under range decoder LCOR Over Range Sub routine Address 147 if 1200 counts Table 8 3 Step 5 routine Address 174 if 100 counts A D Converter Linear Conversion Under Range Sub routine Address 174 if lt 100 counts Table 8 3 Step 10 addresses 076 130 077 Enable linear negative conversion ramp LRMP and count main counter up on every other clock pulse LCNT Check A D Converter output qualifier prior to each count to detect under range in range or over range condition Detect under range ad dress 077 if A D conver ter output qualifier changes before main counter is counted up to 100 counts Linear Nega tive Conver sion Sub routine Display and Remote Talk Subroutine Address 177 if be tween 100 and 1199 counts Table 8 3 Step 38 addresses 130 131 Steps 39 and 42 addresses 131 132 133 Step 41 address 131 LCOR instruction 8 128 Model 436A Service 8 6 Operating Program Description of 11 Block Diagram Description Troubleshooting Sub Routine Address Function Branch To Refer To Service J Sheet Title Det
203. inear Positive Conversion Linear Negative Conversion Log Conversion Relative dB Delay Linear Positive Conversion Linear Negative Conversion Log Conversion Relative dB Power Up Remote Initialize Local Initialize Under Range Power Up Over Range Measurement Remote Initialize Power Up Relative dB Over Under Range Continue Measurement Description Sets sign register sign and clears main counter Enables one up down clock pulse to main counter Clears over range and under range flip flops and loads contents of reference register into relative counter Counts range counter down one range Counts range counter up one range Sets 1 2 of A D conversion control register thereby enabling A D converter to charge to input voltage level Loads remote range select inputs into range register Loads contents of main counter into reference register Loads true range counter and sign preset inputs into main counter and sign register respectively 8 23 Service 8 24 Service Sheet Model 436A Table 8 2 Program Mnemonic Descriptions 5 of 5 Relative dB Measurement Linear Positive Conversion Linear Negative Conversion Log Conversion Display and Remote Talk Power Up Measurement Under Range Over Range Measurement Under Range Power Up Display and Remote Talk Description Serves as down clock to relative counter and as steer ing input to main counter up dow
204. is understanding a general overview of Power Meter operation and troubleshooting rationale is provided in the Block Diagram Description associated with Service Sheets 1 through 5 detailed descriptions of the operating program are provided in Tables 8 3 and 8 6 and Figure 8 15 and circuit descriptions and troubleshooting data are provided as required on Service Sheets 6 through 15 8 57 In addition to the information referenced above this section also contains step by step veri fication procedures for a standard instrument an HP IB equipped instrument and a BCD equipped instrument Each of these procedures are designed to accomplish three major purposes The first purpose is to exercise the stored program and the hardware circuits in a known sequence so that a fault condition can be readily isolated to a circuit group or to a segment of the stored program The second purpose is to describe each check in suf ficient detail to familiarize a maintenance tech nician with overall Power Meter operation The third and most significant purpose is to indicate a logical troubleshooting entry point for program verification and signal tracing 8 58 When the verification procedures are used as a basis for troubleshooting instruments equipped with either the HP IB or BCD option it is neces sary that the standard instrument verification pro cedure be performed first to ascertain that the fault is not in the standard instrument circuits After
205. is counted up to add the reference value to the measured value e If the Main Counter is counted down through 0000 the Borrow output resets the Sign Latch and the count direction is reversed f When the Relative Counter output is 0000 the Main Counter output indicates the measured value with respect to the stored reference 8 139 Model 436A CIRCUIT DESCRIPTIONS Service Sheet 3 cont d b Controller then monitors the count and A D qualifier inputs while generating an LRMP instruction on the negative altemation of every 01 clock pulse and an LCNT instruction on the nega tive alternation of every other 01 clock pulse The LCNT instructions are processed by the Up Down Count Control Logic as indicated in Table 8 7 to provide up clock inputs to the Main Counter The LRMP instructions are clocked into A D Con trol Register by the HPLS 2 clock thereby pro viding a continuous Ramp Enable output to the A D Control Gates This signal is then gated with the outputs of the Sign Latch and the YLOG signal to provide a continuous LRP output when the sign of the input power level is positive and a contin uous LRM output when the sign of the input power level is negative continuous LRP or LRM input causes the A D ramp to be discharged at a constant rate If the ramp discharges through threshold in less than 0100 counts an under range condition is detected If the ramp does not reach thre
206. is selected an LTC instruction is generated to transfer the output of the Sign Latch 8 142 436A service CIRCUIT DESCRIPTIONS TTA TTA IPTE TEETH Service Sheet 3 cont d to the front panel Sign Indicator via the Display Sign Latch to load the output of the Main Counter into the Display Register and to indicate to the Remote Interface Circuits that the measurement is completed If dB REL operation is selected an LCLR instruction is generated prior to the LTC instruction to set the output of the Main Counter to 0000 dB REF operation is selected an LLRE instruction is generated after the LCLR instruction and before the LTC instruction to load the 0000 output of the Main Counter into the Reference Register thereby clearing any reference value previously stored Refer to paragraph dB REL Conversion 8 111 A D Converter dB REL Conversion A dB REL conversion is performed after an in range log conversion when the Power Meter is configured for dB REF or dB REL Mode operation The purpose of this conversion is to indicate the RF input power level with respect to a stored refer ence The reference is selected by pressing the dB REF switch when the desired level is applied to the Power Meter While the dB REF switch is pressed the reference is updated during each pro gram cycle When the dB REF switch is released the reference is frozen and the Power Met
207. ital readout Power Meter which can be operated locally via front panel controls or remotely via the HP IB Interface Bus Option 022 The overall power range and fre quency response of the Power Meter is determined by the Power Sensor to which it is connected 8 73 When the Power Meter is operated locally the Push Button Switch Assembly enables selection of the measurement mode dB watts and the auto ranging circuits normally select the most sensitive range for measurement of input power Should the operator desire to make all measure ments on a specific range however a RANGE HOLD switch allows the Power Meter to be locked in any one of the five measurement ranges 8 74 When the Power Meter is operated remotely the front panel controls are disabled and measure ment mode and range are selected by programming inputs from the remote interface Remote opera tion can only be enabled via the remote interface it cannot be enabled via the front panel 8 75 As shown on Service Sheet 1 all of the Power Meter operating functions are enabled and or sequenced by the outputs of the Controller These outputs in turn are generated by processing the qualifier mode and range select inputs according to an operating program stored in a MOS memory chip Thus in order to understand the functions of the circuits shown on the block diagram it is first necessary to consider their relationship to the operating program An overall flow chart o
208. ivers should be used 8 13 Blade Tuning Tools For adjustment of the front panel CAL ADJ control a special tuning tool is provided HP Part Number 8710 0630 In situa tions not requiring non metallic tuning tools an ordinary small screwdriver or other suitable tool is sufficient No matter what tool is used never try to force any adjustment control in this instrument This is especially critical when adjusting variable inductors or capacitors 8 14 Part Location Aids The locations of some chassis mounted parts and the major assemblies are shown on the last foldout in this manual The locations of individual components mounted on printed circuit boards or other assemblies are shown on the appropriate schematic diagram page or on the page opposite it The part reference designator is the assembly designator plus the part designator for example A2R9 is R9 on the A2 assembly For specific component description and ordering information refer to the parts list in Section VI Service 8 15 Servicing Aids on Printed Circuit Boards The servicing aids include test points transistor and integrated circuit designations adjustment callouts and assembly stock numbers 8 16 REPAIR 8 17 Factory Selected Components 8 18 Some component values are selected at the time of final checkout at the factory see Table 5 1 Usually these values are not extremely critical they are selected to provide optimum compatibility with associated c
209. k Register is tied to ground to hold the register in the set state Since there can only be one talker at time on the HP Interface Bus this function is normally selected only when there is no Remote Interface Controller connected to the system e g when the Power Meter is interconnected with an HP 5150A Recorder as the Power Meter has no provision for generating programming commands necessary to control the operation of other instru ments on the HP Interface Bus 8 146 8 123 Remote Enable Remote operation of the Power Meter is enabled when the HREM and Remote Enable LREM outputs of the Remote Enable Logic are true refer to Table 8 6 and to the Data Mode Programming paragraph These outputs are provided by a gated flip flop which is set only when the Listen Clock and Address Enable signals are active while the Remote Enable REN input is true low Thus to select remote opera tion of the Power Meter it is necessary to address the Power Meter to listen after the Remote Enable REN line is set true The Remote Enable Logic will then remain set until the Remote Enable REN line is set false to terminate remote opera tion of all instruments on the HP Interface Bus NOTE When the Power Meter is addressed to talk it will output data after each meas urement regardless of whether it is con figured for local or remote operation Refer to Figure 8 15 Sheet 14 8 124 The remaining input to the Remote Enable Logic is t
210. linear operation of the Power Meter LOG Mode input inactive and lights a front panel lamp to indicate that the Digital Read out is in Watts W milliwatts mW microwatts uW or nanowatts nW c True Range Counter and Sign Preset This output is provided only for dB operation of the Power Meter Log Mode input active and presets the Main Counter the predetermined value assigned as the starting point for the particular dB range selected For any A D conversion the Main Counter is always preset to the lowest value associ ated with a particular range and then counted in the direction of increasing power When WATT Mode operation of the Power Meter is selected the starting value for each range is 0000 When dB mode operation of the Power Meter is selected the starting point for each range depends on the sensitivity of the Power Sensor e g for the 10 dB range the Main Counter is preset to 2000 and the sign is preset to for the 20 dB range the Main Counter is preset to 1000 and the sign is preset to d Decimal Point Select This output is pro vided for both linear and dB operation of the Power Meter and lights the appropriate decimal point on the Digital Readout to indicate the true sensitivity of the range selected e g 1 000 mW 10 00 mW 20 00 dB 8 85 Display Assembly The Display Assembly indicates the Power Meter s operating mode and range status and displays the sign and numeric value
211. lize Subroutine Initialize Subroutine hold loop Following the talk cycle a trigger with settling time Remote Initialize Subroutine Address is programmed to range 2 access time to the 10 001 010 1 11 000 010 first data character is approximately 1130 ms 00 001 011 2 01 000 100 Thus the calculator should detect STAT 00 001 101 3 01 000 100 13 2 01 000 001 4 01 000 100 Line 1550 The following display is observed with the logic analyzer connected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 0124 Remote Initialize Subroutine Address 001 010 1 10 001 111 001 011 2 011 000 001 101 3 011 110 001 110 4 010 111 001 010 1 11 000 010 001 011 2 01 000 100 001 101 3 01 000 100 to complete the output data transfer to the Power Meter to initiate the next 000 001 4 01 000 100 38 Error Power Meter takes trigger with GO TO line 1610 and use STEP key to manually execute program settling time measurement when program line by line Check that the following display is obtained with the med to trigger immediate logic analyzer connected normally and set up for single sweep ated for the previous test Then a trigger talk cycle and the calculator checks I O Description A talk cycle is first enabled TRIGGER WORD 012 Remote Initialize Subroutine Address immediate programming command is sent status after a 200 ms delay Since the Power Meter is programmed to the Watt Mode
212. ll occur if both clock inputs are low simultaneously Both counters will respond to a clock pulse on either input by changing to the next appropriate state of the count sequence The state diagram for the decade counter Figure 8 8 shows both the regular sequence and the sequence if a code greater than nine is present in the counter 8 42 Both counters have paralel load asynchronous facility which permits the count ers to be preset Whenever the Parallel Load input and Master Reset are low the information present on the inputs will be loaded into the counters and appear at the outputs independently of the conditions of the clocks When the Parallel Load input goes high this information is stored in the counters When the counters are clocked they will change to the next Model 436A service DECADE COUNTER BINARY COUNTER COUNT UP COUNT UP COUNT BOWN COUNT DOWN lt lt MODE SELECTION SUMMARY Both Counters Preset Preset Change Count Up Count Down H HIGH Level X Don t Care Condition L LOW Level Clock Pulse Figure 8 8 Programmable Counters 8 11 HELrvice Digital Integrated Circuits and Symbols cont d appropriate state in the count sequence The D inputs are inhibited when C is held high and have on the counters 8 43 The Terminal Count Up 9 4 or 15 4 or Terminal Count Down 0 1 outputs carry an
213. ller to provide timing refer ences for execution of the operating program and to function in conjunction with the Analog to Digital Converter to convert the output of the Amplifer Demodulator and Filter Circuit to an equivalent BCD number c Display The Display is updated during each program cycle as required to indicate current range mode input power level and or over under range status After each update the new indications are continuously maintained until the next update d Controller The Controller provides the necessary hardware software interface between the operating program and the remainder of the Power Meter circuits e Pushbutton Switch Assembly The Push button Switch Assembly is enabled when the Power Meter is configured for local operation and is disabled when the Power Meter is configured for remote operation When enabled the switches provide continuous mode select and auto range qualifier outputs which are processed by the Controller once during each operating cycle to enable the desired Power Meter operation f Remote Interface Circuits The Remote Interface Circuits enable the Power Meter to be interfaced to a remote controller via an HP IB or BCD format Thus when remote operation is enabled these circuits essentially take over the 8 117 Service Model 436A CIRCUIT DESCRIPTIONS Service Sheet 1 cont d functions of the Pushbutton Switch Assembly and the Display in th
214. lop was set by a Triggered Measurement Programming Command the H HOLD qualifier will be high after the LTC instruction and the operating program will enter an idle state during the Local Remote Branch Subroutine while awaiting a Free Run or Triggered Measurement Programming Command to initiate the next measurement The reason that an Output Data Transfer is synced to the LTC instruction for a Triggered Measurement Programming Command is to ensure that valid measurement is taken before the Power Meter outputs data after being addressed to Talk 8 147 The remaining input to the Hold and Trig ger Flip Flops is the LPU output of the Controller and the Device Clear Decoder When this input is active both registers are reset and a high H HOLD qualifier is applied to the Remote Multiplexer to place the Power Meter in a hold condition 8 148 Remote Oualifier Program Interface When remote operation is enabled each of the qualifier inputs to the Remote Qualifier Multi plexer is accessed at some point in the operating program cycle The purpose and function of each qualifier is provided in Table 8 2 along with a listing of the subroutines in which the qualifier is accessed The manner in which the qualifier is accessed by the operating program is covered on Service Sheet 3 Block Diagram Description NOTE The Remote Qualifier Multiplexer inverts the qualifier inputs Thus a true quali fier input will be in the opposite state
215. low description which indicates how the hardware circuits operate to perform the function To close the theory trouble shooting loop an additional reference is made to a checkout procedure which can be used to verfiy that the function was performed properly 8 92 The best way to use the information in Table 8 6 is in small segments Refer to Figure 8 15 and follow program execution starting at the Power Up Subroutine If circuit operation is obvious go on to the next subroutine If it is not obvious refer to Table 8 6 and proceed to the Block Diagram Description referenced The Block Diagram Descriptions are written in terms of hard ware operation They summarize qualifier instruction communication and concentrate on explaining how the instruction is processed to enable the function and on how the qualifier is generated to indicate status After a general under standing of hardware operation is gained go back to Figure 8 15 and trace out the address branching required to effect the qualifier instruction com munications talked about in the Block Diagram Description When a logic analyzer is available each of these address branches serve as a valuable tool for troubleshooting Overall circuit operation can be rapidly analyzed by looking at key addres ses within the subroutines refer to example provided under TROUBLESHOOTING Table 8 3 Standard Instrument Checkout When the problem is isolated to a circuit additional addresse
216. lter especially in the two most sensitive ranges or the Lead Lag Amplifier which is an active low pass filter A noise problem in the Lead Lag Amplifier will be evident only during the zeroing sequence DC Amplifier and Servo Amplifier Measure the dc input and output voltages Verity that the amplifier outputs respond properly to the inputs For troubleshooting operational amplifiers Lead Lag Amplifier refer to Linear Integrated Circuits in Section A Servo Amplifier problem will be evident only during the Sensor Zero sequence Auto Zero Assembly The normal value range of the offset error voltage at pin 5 is about 14 to 14 mVdc The power sensing device normally exhibits a slight positive output due to ambient temperature there fore the normal correction voltage is slightly nega tive hence 4 mVdc The voltage measured at 6 will provide an indieation of how long the charge is retained on 1 The voltage should remain virtually unchanged 1 mVdc for 24 hours If any component in the A3A1 assembly is found to be defective the entire assembly must be replaced 8 172 Sor ioa UO U Z7 A D Converter Circuit Set Power Meter to Watt Mode and apply a 1 0 mW input signal to Power Sensor Check that Power Meter is on range 3 and DC should be approximately 1 0 Check 2 for to 7 0 volt ramp with a time o
217. ment point signifies no circuit signifies measuring aid schematic diagram Look for measuring aid provided metal post circuit pad etc circled letter on service provided sheet indicated by adjacent boid number 3 in this Plugin connection information Assembly part number Socket designalion for A2 assembly Number indicates Assembly name pin of socket N J3 not mounted Stage name qn on assembly A2 DC REGULATOR ASSY 08708 60007 or chassis Assembly designation REFERENCE OESICSATIONS OUTLINED Lem e ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER eg OF ASSEMBLY AI 35 AIR DESIGNATIONS OF OTHER COMPONENTS ARE COMPLETE AS SHOWN Non plug in connection information Soider point named REFERENCE DESIGNATION Circuit board common Connector symbols within the NO PREFIX A2 ASSY A2 Dagger indicates borderlines of circuit assemb correct change See lies signify connections to the Section Vil assembly which are separate from those made through the integral XA2 Conducting connection plug part of the assembly to chassis or frame Value selected for best operation Value shown is average or most commoniy selected value Asterisk indicates factory selected component Wire color code Code used MIL STD 681 is the Reference designators deleted by circuit changes are listed same as the resistor colo
218. n count control logic Sets 1 2 of A D conversion control register Output of register is then gated with various status signals to enable A D converter conversion ramp as follows Linear Positive Conversion Ramp enabled when Watts mode selected and A D input voltage exceeds threshold Linear Negative Conversion Ramp enabled when Watts mode selected and A D input voltage is below threshold Log Conversion Ramp and Log Reference enabled when dBm or dB Rel mode selected Remote talk I O transfer control signal refer to de scription and timing diagram provided under Principles of Operation Sets overrange flip flop to provide blanking output to display and if under range flip flop is reset to light OVER RANGE lamp Sets underrange to light UNDER RANGE lamp Clocks display sign flip flop and loads sign and con tents of main counter into display registers Model 436A Service POWER ON 000 SHEET 4 POWER UP SUBROUTINE 025 SHEET 4 LOCAL REMOTE BRANCH LOCAL SUBROUTINE REMOTE SHEET 5 012 5 LOCAL INITIALIZE INITIALIZE SUBROUTINE SUBROUTINE RANGE 1 OR 2 SLOW RANGE 3 4 08 5 SLOW 055 SHEET 6 SUBROUTINE FAST RANGE 9 SLOW 0 SHEET 7 61 MEASUREMENT SUBROUTINE LOG MODE A D OUTPUT NEGATIVE LOG MODE A D OUTPUT POSITIVE WATTS MODE SHEETS 8 amp 9 LINEAR POSITIVE OR NEGATIVE CONVERSION 190 COUNTS
219. n of the 3 line to 8 line decoder is shown in the truth table in Figure 8 9 8 47 Data Selector Multiplexer There are two types of data selectors used in the Power Meter an 8 input data selector and a 16 input data selector The operation of both data selectors are identical except for the number of inputs Therefore only the operation of the 8 input data selector is described and the symbol shown in Figure 8 10 One of the 8 input lines 0 through 7 is selected by the SEL output GO through 7 The strobe input G8 must be low in order to enable the output lines If the strobe input is high the output lines are inhibited and present a high impedance This circuit uses Three State logic so that the outputs may be connected into a wired OR configuration 8 48 Display Driver The display driver Figure 8 11 accepts a 4 bit binary code and provides output drive to light the appropriate segments of a 7 segment numeric display The decode format employed allows generation of numerie codes 0 through 9 as well as other codes shown in the truth table in Figure 8 11 Truth Tahle Inputs Outputs PIN PIN 4 SE 5 IL ID N c ZEE T ww no
220. n servicing the Power Meter d Repair Provides general information for replacing factory selected components and instru ment disassembly procedures e Basic Circuit Descriptions Describes the functional operation of linear and digital integrated circuits used in the Power Meter f Troubleshooting Provides step by step procedures for checkout and troubleshooting of a standard instrument and a verification program for checkout and troubleshooting of an HP IB equipped instrument Additional circuit trouble shooting data is provided as required on the individual service sheets located at the end of the section g Principles of Operation Principles of operation are provided on two levels in this section The first level is a block diagram descrip tion which covers the overall operation of the Power Meter in detail and is located at the end of the section just before the service sheets The second level consists of detailed circuit theory descriptions which are provided as required on the individual service sheets with the appropriate schematics h Service Sheets Foldout service sheets are provided at the end of the section Service Sheet 1 is an overall block diagram which illustrates major signal flow and circuit dependency and is keyed by the numbers in the lower right hand corners of the individual blocks on the diagram to the detailed block diagrams The detailed block dia grams provide an assembly by assembly des
221. nd and print out TESTS COMPLETE to indicate that the Power Meter is functioning properly 8 67 the Power Meter does not function properly for any of the tests contained in the program the program will halt and print out an error number Table 8 4 describes the specific problem associated with each error number the test background and rationale for the error and a logical procedure for isolating the error Specific programming statements and references contained in Table 8 4 are applicable to the HP 9830A Diagnostic Program only if an HP 98204 Calculator is used for the checkout of the Power Meter it wil be necessary to convert the programming statements and references to the 9820A equivalents The fault isolation procedure in turn is written in general terms and assumes an understanding of HP IB circuit operation and Power Meter operating program execution For information covering the Power Meter operating program refer to Figure 8 16 Table 8 3 and Table 8 4 For information covering HP IB circuit operation refer to Service Sheet 4 NOTE read byte subroutine is provided at the end of the diagnostic program to facilitate fault isolation When this subroutine is used the calculator display is two words behind the HP IB ROM output see Service Sheet 4 ie when the ROM is outputting word 2 word 1 is in the calculator s I O register and word 0 is displayed 8 69 service Model 436A Figure 8 16 HP
222. nging not selected LLRA Table 8 4 Error 4 and 4 5 HP IB Option Count range counter down Address 015 Not verified to range 5 if range 6 or 7 selected LCRD Range Selection Range Programming Processing Clear main counter Address 015 LCLR Table 8 4 Error 4 45 amp 12 HP IB Option N A Circuit Opera tion covered under Digital Integrated Circuits amp Symbols Check whether delayed Address 016 for Table 8 4 Error Program Execution or immediate measure delayed measure 3 HP IB Measurement Rate ment Option Programming Com ment enabled FAST 035 mand Processing Address 101 for im mediate measure ment Table 8 4 Error 33 HP IB Option 8 125 service 456A Table 8 6 Operating Program Descriptions 3 of 11 Remote Initialize Cont d Determine Range YR1 YR2 YR3 Load mode select inputs into mode register Determine mode selected for previous program cycle Auto Zero subrou tine Address 056 for range 34 07 5 Delay subroutine Address 036 for range 1 or 2 Address 104 if Watts mode was selected for pre Block Diagram Description Setvice Title Range Selection Troubleshooting Refer To Tabie 8 4 Error 11 and 12 HP IB Option Table 8 4 Errors 4 4 5 and 5 HP IB Option Mode Selection Table 8 4 Error Mode Selection 36
223. nts in the program cyle the auto zero timing interval varies according to the instantan eous conditions detected While the AUTO ZERO ENABLE input is active the Auto Zero Switch is closed and a feedback loop is configured from the output of the Comparator to the positive input of the Ramp Generator Loop stability is achieved when capacitor C1 charges such that the output of the Comparator is 2 00 Vdc When the Auto Zero Enable input is terminated the Auto Zero Switch is opened and the charge on C1 holds the output of the Comparator at 2 00 Vdc which is the appro priate mid range value for initiating the measure ment function 8 80 A D Converter Measurement Function The measurement function is initiated when the Con troller activates the Load DC INPUT This input is then maintained active for approximately 33 ms The Controller enables the Main Counter when the input is activated and terminates the input when the output of the Main Counter reaches 2000 While the input is active the DC Input Switch is closed to allow to charge to 7 times the DC Input level When the input is terminated the DC Input Switch is opened and the Controller enables a linear or log conversion to discharge C3 8 81 A D Converter Linear Conversion A linear conversion function is selected to discharge when the Power Meter is configured for WATT MODE operation During the conversion C3 is discharged at the rate of 3 mV per clock pulse and t
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225. o programming command and provides auto zero enable output 2 Range select logic stores range programming command and provides range 2 output 3 H HOLD output of measurement rate select logie set low by trigger with settling time programming command 4 Operating program branches from Display and Remote Talk Subroutine to Local Remote Branch Subroutine 5 Operating program branches to Remote Initialize Sub routine and the following display is observed with logic analyzer connected normally and set up for single 8 102 Model 436A Service Tahle 8 4 Circuit Troubleshooting 5 of 18 Problem and Description Corrective Action 4 Description cont d 45 2 Theerrornumberissetto 4 5 and B a Line 420 cont d cont programming commands and status check are sweep TRIGGER WORD 01 28 Remote Initialize Sub repeated Thus if error number 4 is detected routine address and error number 4 5 is not detected it indi eates that the first Power Meter data output 10 001 010 1 01 019 111 9 occurred before the remote programming 00 001 011 2 01 010 111 10 commands were accessed by the operating 10 001 101 3 01 010 111 11 program during the Remote Initialize Sub 00 001 110 4 01 010 111 12 routine Power Meter free runs instead of 10 001 111 5 01 010 111 13 entering hold loop until trigger input is 00 011 000 6 01 010 1
226. of the RF input power level applied to the Power Sensor The status indications are provided via individual light emitting diode LED indicators that are turned on and off independently by the inputs from the Controller and the True Range Decoder The power level indications are displayed via numeric segment indicators Digital Readout The sign indiction is controlled directly by the output of the Controller When the Display Sign minus input is active the center segment of the first indicator is lighted to display a minus sign when the input is not active the segment is turned off to indicate a positive sign 8 86 The numeric value indication is effected by clocking the BCD output of the Main Counter into 8 122 the Display Drivers on the positive going edge of the Display Count Strobe The Display Drivers then convert the BCD input into a format that lights individual segments of the numeric indicators to form a decimal number Decimal point posi tioning is controlled by the Decimal Point Select output of the True Range Decoder The LBLANK input to the Display Drivers is activated to blank all but the most significant digit for various under and over range conditions Similarly the Display Drivers also employ a ripple blanking capability to turn off the most significant digit when it is a zero 8 87 Service Sheet 3 8 88 General order to understand the opera tion of the circuits shown on the block diag
227. omponents These components are identified on individual schematics by an asterisk The recommended procedure for replacing a factory selected part is as follows a Try the original value then perform the calibration test specified for the circuit in the performance and adjustment sections of this manual b If calibration cannot be accomplished try the typical value shown in the parts list and repeat the test c the test results are still not satisfactory substitute various values within the tolerances specified in Table 5 1 until the desired result is obtained 8 19 Disassembly and Reassembly Procedures WARNINGS Any adjustment maintenance and repair of the opened instrument under voltage should be avoided as much as possible and if inevitable should be carried out only by a skilled person who is aware of the hazard involved Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its source of supply 8 20 Before performing any of the following disassembly or reassembly procedures the follow ing steps must be performed a Set POWER ON OFF switch to OFF position b Remove Line Power Cable W8 from Line Power Module A11 8 5 OCI VICE Disassembly and Reassembiy Procedures cont d 8 21 Top Cover Removal To remove the top cover from the Power Meter follow the steps as listed below a Remove Pozidriv screw from rear edge of top cov
228. ont panel Sign Indicator via the Display Sign Latch to load the output of the Main Counter into the Display Registers and to indicate to the Remote Interface Circuits that the measurement is completed If dB REL operation is selected an LCLR instruction is generated prior to the LTC instruction to set the output of the Main Counter to 0000 If dB REF operation is selected an LLRE isntruction is generated after the LCLR instruction and before the LTC instruc tion to load the 0000 output of the Main Counter into the Reference Register thereby clearing any reference value previously stored Refer to the paragraph dB REL Conversion 8 109 A D Converter in Range Registration Registration of an in range conversion is described in the following paragraphs a The LRMP instruction is terminated causing the HPLS 2 clock to reset the LRMP output of the A D Control Register With this signal reset the LRL output of the A D Control Gates is disabled thereby terminating the conver sion b The LCNT instruction is also terminated to freeze the number the Main Counter c An LCOR instruction is generated to reset the outputs of the Under Over Range Decoder d The Mode Qualifier Bits are checked to determine whether dBm dB REL or dB REF operation is selected If dBm operation is selected an instruction is generated to transfer the output of the Sign Latch to the front panel Sign Indicator via the Display
229. ontroller as YRR1 YRR2 and YRR3 Range Select inputs Since the Auto Range Qualifier is reset the Controller loads these inputs into the Range Counter at the start of each program cycle when remote operation is enabled to select the operating range for the Power Meter 8 138 After a Range Select Command is loaded into the Range Select Logic flip flops the flip flops are inhibited from changing state until a new Range Programming Command or an LPU input is received When a new Range Programming Com mand is received the outputs of the flip flops change to reflect the new range encoded in the command When an LPU input is received the Range flip flops are reset and the Auto Range flip flop is reset to select Auto Ranging when remote operation of the Power Meter is enabled refer to the paragraph on Auto Range Pro gramming Command Processing 8 139 Auto Range Programming Command Processing The LPU input and the Auto Range Enable output of the Function Decoder set a flip flop in the Range Select Logic The output of the flip flop is then gated with the HREM input to select Auto Ranging when remote operation is enabled HREM high and to allow front panel WIRED OR range control of this function when local operation is enabled When remote operation is enabled and the Auto Range Qualifier is true the Range Select outputs are not loaded into the Range Counter at the start of each program cycle Instead the Range Counter is
230. ossible status outputs to the Remote Interface Control Circuit f If the measurement was taken on ranges two through five with Auto Ranging enabled an LTC instruction is not generated Instead an LSOR instruction is generated to enable the LBLANK output of the Over Under Range Decoder and thus blank the front panel display An LCOR instruction resets all outputs of the Over Under Range Decoder An LSOR instruction enables the LBLANK HOR and OR LED outputs An LSUR instruction enables the HUR and UR LED outputs and resets the OR LED output it does not affect the LBLANK or HOR outputs The Over Under Range Decoder outputs are not pro cessed by the Remote Interface Circuits until an LTC instruction is generated Following the LSOR instruction and LCRD instruction is generated to count the Range Counter down one range then another measurement is taken This cycle is repeated until either an in range measurement is obtained or the Range Counter is counted down to range 1 Registration of an in range condition is accomplished the same as for a range 1 under range condition 8 105 A D Converter Linear In Range Registra tion Registration of a linear in range conversion is accomplished as previously described for an under range range 1 condition 8 106 A D Converter Linear Over Range Registra tion Registration of an over range conversion is described in the following paragraphs a LRMP instruction is disabled causing
231. ote operation the Remote Enable input is low the outputs of the Pushbutton Switch Assembly are held at logic 1 and the Mode Select outputs of the Remote Interface Circuits select the operating mode of the Power Meter 8 97 The Mode Select inputs 1 and 2 coded as indicated below to select the operating mode of the Power Meter These inputs are clocked into the Mode Register at the start of each program cycle by the LCKM output of the Instruction Decoder The resultant outputs of the Mode Register are then gated together for the duration of the program cycle to provide the following signals as required to implement the operating mode selected 1 2 dB REL dB REF dBm a Mode Qualifiers These outputs are coded as listed above to indicate the operating mode selected They are accessed at various points in the program cycle to control program branching and or instruction generation b dBm Mode Selected When the dBm Mode is selected this output is active and lights the front panel dBm indicator Log Mode and YLog These outputs are active when either the dBm dB REF or dB REL Mode is selected The Log Mode signal forms part of the address applied to the True Range Decoder The YLOG signal is gated with other inputs by the Up Down Count Control Logic to control the direction in which the Main Counter counts when enabled by the Controller d Mode Bits 1 and 2 Mode Bits
232. out error number RUNNING does not flash periodically on calculator display Description Signal output from Power Meter causes calculator to lock up Turn power on and off to Power Meter restart program at line 10 STEP PROGRAM and verify handshake timing refer to Service Sheet 4 Turn power on and off to Power Meter Then initialize test pro gram INIT key and use STEP key to execute test program line by line Check that the following indications are obtained for line 110 following display is obtained with logic analyzer con nected normally refer to troubleshooting example and set up for single sweep TRIGGER WORD 0448 Display and Remote Talk Subroutine Address Power Meter is addressed to talk 00 010 011 15 00 010 010 7 00 100 100 16 00 010 011 8 10 100 101 1 10 100 100 9 00 100 110 2 00 010 010 10 01 001 000 3 00 010 011 11 01 001 001 4 10 100 100 12 11 001 010 5 00 010 010 13 10 100 100 6 00 010 011 14 Turn power on and to Power Meter Go to line 110 and use STEP key to execute program line by line Check that the follow ing indications are obtained a Line 160 1 Power Meter is unaddressed to talk Description 1 Interface Bus is set to remote then Power Meter is addressed to listen and pro grammed to free run at maximum rate dB REF mode 2
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234. perational Amplifiers Operational ampli fiers are used to provide such functions as summing and offsetting voltages as buffer amplifiers detectors and in power supplies The particular function is determined by the external circuit connections Equivalent circuit and functional diagrams for typical operational amplifiers are contained in Figure 8 3 Circuit is a non inverting buffer amplifier with gain of one Circuit B is a non inverting amplifier with gain determined by the resistance of R1 and R2 Circuit C is an inverting amplifier with gain determined by R1 and R2 with the input impedance equal to R2 Circuit D shows the equivalent circuit and typical param eters for an operational amplifier NOTE It is assumed that the amplifier has high gain low output impedance and high input impedance 8 27 Troubleshooting An operational amplifier can be characterized as an ideal voltage amplifier having low output impedance high input impedance and very high gain Also the output voltage is proportional to the difference in the voltages applied to the input terminals In use the amplifier drives the input voltage difference close to zero 8 28 When troubleshooting an operational ampli fier measure the voltages at the two inputs with no signal applied the difference between these volt ages should be less than 10 mV A difference voltage much greater than 10 mV indicates trouble in the amplifier or its external circuitry U
235. present at the data input is transferred to the active high and active low outputs on a low to high transition of the clock C input The data input is then locked out and the outputs do not change again until the next low to high transition of the clock input 8 34 The set S and reset R inputs override all other input conditions when set S is low the active high output is forced high when reset is low the active high output is forced low Although normally the active low output is the complement of the active high output simultaneous low inputs at the set and reset will force both the active low and active high outputs to go high at the same time on some D type flip flops This condition will exist only for the length of time that both set and reset inputs are held low The will return to some indeterminate state when both the set and reset inputs are returned to the high state 8 35 Four Bit Bistable Latch The four bit bi stable latch shown in Figure 8 5 consists of four independent D type flip flops The flip flops FF1 and FF2 are controlled by the C1 clock input and the flip flops and FF4 are controlled by the C2 clock input Information present at a data input is transferred to active high active low outputs when the associated clock input is high the outputs will follow the data as long as the clock remains high When the clock goes low the information that was pr
236. put checked Data output should correspond to minimum threshold of dBm range 1 30 dBm YILT Table 8 4 Circuit Troubleshooting 13 of 18 Problem and Description Corrective Action A Manually program Power Meter to dBm mode range 4 trig gered with settling time CMD 0 D4T B Verify Power Meter mode data and range character output per Read Byte Subroutine starting at line 5000 Data out put should correspond to indication on Digital Readout previously verified for local operation C Check that 1 Mode select logic outputs dBm mode 2 Range select logic outputs range 4 3 Range counter is preset to range 4 during Remote Initialize Subroutine A Manually program Power Meter to dBm mode range 5 trig ger with settling time CMD U D5T B Verify Power Meter mode data and range character output per Read Byte Subroutine starting at line 5000 Data output should correspond to indication on Digital Read out previously verified for local operation Check that 1 Mode select logic outputs dBm mode 2 Range select logic outputs range 5 3 Range counter is preset to range 5 during Remote Initialize Subroutine A Manually program Power Meter to dB REF mode auto range trigger with settling time CMD 20 D9T Verify Power Meter mode range and
237. r Logic EE Maximum uas up ats 1 0 1 1 peu 0 0 NE 0 0 1 0 1 0 1 1 t P1 1 voltages shown are t 0 1 Power Sensor Maximum did Minimum S Ranges and Resistor Values 100 uW 10 dBm 10 nW 50 dBm 14 7kQ 1 mW 0 dBm 100 nW 40 dBm 21 5kQ 210 mW 10 30 dBm 34 8kQ 8481 A 8482A 8483A 100 mW 20 dBm 10 uW 20 dBm 00 Gnd 1 W 30 dBm 100 pW 10 dBm 1 82kQ 8481H 8482H _ 5 10 W 40 dBm 1 mW 0 dBm 3 460 84818 84828 100 W 50 dBm 10 mW 10 dBm 00 6 19 10 uW 20 dBm 1 nW 60 dBm 10 0k2 input and Output Code for 206 12 5V 0 amp Q 3V 1 0 6V 0 0 1V a 8 170 03552 9 Seats Ged WAU 9 UI319AUI Aui 942 182 3ndjno AUFUOU 019152 104 sindgno 59148 uou uo NAHIS saqe ees Apoyeuuxojdde syndino syndur ayy syndut SureAur uou punoa8 0 Apegeurrxoadde syndqgno ayy sjndut arpsod 589 y pue 03 syndul SuryreAuruou pesn 8ureq xosuog Aq peuruuoejep iepooe q eni y 01 epoo jndur euo seprAoJd 104291 AjtAnsueg 1osueg
238. r clocks the 1103 data bit input into a flip flop in the Cal Factor Disable Logic output of the is then gated with the HREM input When the HREM input is low indicating that local operation is enabled the Cal Factor Disable line is set false to enable the CAL FACTOR switch refer to Service Sheet 2 When the HREM input is high indicating that remote operation is enabled the state of the stored 1108 bit controls the Cal Factor Disable output For a Cal Factor Enable Programming Com mand the stored bit is low and sets the Cal Factor Disable output false to enable the front panel CAL FACTOR switch For a Cal Factor Disable Programming Command the stored bit is high and sets the Cal Factor Disable output true to disable the CAL FACTOR switch Disabling the switch is the same as setting it to the 10092 position 8 142 After a Cal Factor Programming Command is loaded into the Cal Factor Disable Logic flip flop the flip flop is inhibited from changing state until a new Cal Factor Programming Command or an LPU input is received When a new Cal Factor Programming Command is received the flip flop changes state to reflect the new state of the 1103 data bit When an LPU input is received the flip flop is preset to set the Cal Factor Disable output true disabling the front panel switch 8 143 Measurement Rate Programming Command Processing The Rate Clock 1 and 2 outputs of the Function Decoder are ORe
239. r eode First number iden here tifies the base color second number the wider stripe Large numbers in lower right corners of schematic diagrams and the third number the narrower stripe Example are service sheet numbers denotes white base yellow wide stripe They are provided List of all ihe reference desig venience in tracing inter violet narrow stripe nations on the diagram connections Assembly reference designator s Figure 8 1 Schematic Diagram Notes 3 of 3 8 4 AA FLT 4 amp 0 Modei 430A Safety Considerations cont d The use of repaired fuses and the short circuiting of fuseholders must be avoided 8 8 Whenever it is likely that this protection has been impaired the instrument must be made inoperative and be secured against any unintended operation WARNING The service information is often used with power supplied and protective covers removed from the instrument Energy available at many points may if contacted result in personal injury 8 9 RECOMMENDED TEST EQUIPMENT 8 10 Test equipment and test equipment accessories required to maintain the Power Meter are listed in Table 1 2 Equipment other than that listed may be used if it meets the listed critical specifications 8 11 SERVICE AIDS 8 12 Pozidriv Screwdrivers Many screws in the instrument appear to be Phillips but are not To avoid damage to the screw slots Pozidriv screw dr
240. ram HP 9830A Calculator 25 of 25 1 1 service Model 436A 17 HP IB Verification Program HP 9820A Calculator 1 of 4 igure 8 F 8 95 450A Figure 8 17 HP IB Verification Program HP 9820 Calculator 2 of 4 8 96 RAL A 436 Service Figure 8 17 Verification Program HP 9820A Calculator of 4 8 97 Model 436A HP IB Verification Program HP 9820A Calculator 4 of 4 47 igure 8 F 8 98 Model 436A 1 Problem Power Meter does not output data after being addressed to talk Description Interface Bus is set to local Remote Enable line false and Power Meter is addressed to talk Caleu lator I O status is then checked to verify that Power Meter outputs data character during Display and Remote Talk Subroutine Problem Power Meter data output indi cates dB REF mode selected Table 8 4 Circuit Troubleshooting 1 of 18 Problem and Description Corrective Action that IFC input to Power Meter Service Sheet 11 is not being held low by some circuit in Power Meter Check that Power Meter output Service Sheet 12 is not held low indicating that Power Meter has data output for calculator Problem Program hangs up without printing
241. ram it is necessary to consider Power Meter operation in terms of the operating program stored in the State Controller As stated previously the program is executed on a cyclic basis with one measurement taken and the results displayed per cycle On Figure 8 15 Sheet 1 it is shown that each cycle starts when the program enters the Local Remote Branch or Local Initialize Subroutines and ends when the program exits the Display and Remote Talk Subroutine Between these two points in time a number of additional subroutines are executed to control circuit operation on a step by step basis Each step is a two way communication between the program and one or more circuits The talk lines are the outputs of the Instruction Decoder and the listen lines are the qualifier inputs to the Line Selector To effect the communication each step occupies two addresses to allow an either or decision and to select the next step refer to paragraph 8 94 Program Execution Since the decisions are made in series each subroutine can be viewed as a sequential logic circuit charged with the responsibility of controlling one or more opera ting functions 8 89 For purposes of definition the Power Meter operating functions can be divided into two classes fixed and variable Fixed functions are basic to each measurement and are performed during each cycle Variable functions are associated with a particular mode measurement status etc They are performed only
242. rated during the Under Range Sub routine to count the Range Counter down to range 4 then an LSOR instruction should be generated to blank the front panel digital readout refer to Service Sheet 3 Linear Under Range Conversion The range 4 output of the Range Counter in turn should cause the True Range Decoder to change the digital readout decimal point position and should also select higher gain operation of the Amplifier Demodulator and Filter circuit Thus the input voltage to the A D Converter at DC test point 4 should rise to 0 980 by the time that the subsequent Auto Zero Subroutine is completed Program execution and circuit operation from this point on was verified in steps 1 through 7 The key step in isolating an abnormal indication then is to check that the output of the Amplifier Demodulator and Filter circuit rises to the specified value by the end of the Auto Zero Subroutinte which follows the Under Range Sub routine The main reason for making this check AA E EEUU HEA A 8 19 Service 450A TROUBLESHOOTING Standard Instrument Checkout cont d first is that if the output of the Amplifier Demod ulator and Filter circuit does not rise to an in range level by the end of the Auto Zero Sub routine a range 4 under range conversion will be detected second Under Range Subroutine will then be executed to count the Range Counter down to range 3 and the range
243. readjust CAL ADJ control to obtain 0 00 dBm indication Cue DESCRIPTION This step sets the A D Converter Log Con version threshold KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below Measurement Subroutine A D Converter input voltage at DC test point is 0 100 0 002 Vde Ramp amplitude at RMP test point A3TP2 is 0 71 0 144 Vp p LZR potentiometer be adjusted so that YPLS qualifier alternates between 0 and 1 at address 066 When YPLS 0 branch to Under Range Subroutine reference previously verified When YPLS 1 branch to Log Conversion Subroutine Log Conversion Subroutine Detect YPLS 0 at address 135 DESCRIPTION This step verifies the exponential slope of the log conversion ramp and the branching between various addresses Branch to Relative dB Subroutine Relative dB Subroutine Branch to Display and Remote Talk Subroutine in the Log Conversion Subroutine KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below A D Converter Input Voltage DC Test Point A3TP4 0 117 0 002 0 70 0 02 dBm 0 126 0 002 1 01 dBm 0 159 0 002 2 02 dBm Ramp Amplitude RMP Test Point 2 0 831 0 014 0 895 0 014 1 129 0 014 If necessary adjust LFS potentiometer A3R48 to obtain specified ramp amplitude
244. ress an unlisten command a universal device clear command an interface clear IFC input and a remote enable REN input 8 119 Handshake Timing When the HP IB cir cuits are in the command mode the LATN output of the Clock Generator is held low to disable the Function Decoder and to enable the Listen Trans fer Control Gates LATN input to the Listen Transfer Control Gates is OR ed with the L Listen input so that the gates are also enabled when the bus is in the data mode and the Power Meter is addressed to listen While the Listen Transfer Control Gates are enabled they function in con junction with the Clock Generator to generate the NRFD and NDAC outputs necessary to complete each Remote Interface Controller initiated data transfer cycle When the gates are disabled the NRFD and NDAC outputs are set high so that they wil not interface with HP Interface operation When the Remote Interface Controller has data available it sets the DAV line low thereby enabling the Clock Generator to set the Data Accept Clock low a short time later as shown Figure 8 19 The Listen Transfer Control Gates in tum process the low Data Accept Clock to set the NRFD line low Not Ready For Data and the NDAC line high Data Accepted These outputs are then maintained until all instruments on the HP Interface Bus indicate that they have accepted the data When this occurs the Remote Interface Controller sets the DAV line
245. rocedure Test Description and Key Operating Sequence 20 Set Range Calibrator FUNCTION switch to DESCRIPTION This step provides fine adjustment of the STANDBY press Power Meter SENSOR ZERO OFF potentiometer ZERO switch and adjust ZERO OFF po tentiometer as required to obtain 0 00 2 0 02 indication with blinking sign while ZERO lamp is lit Verify that UNDER RANGE lamp does not light and that Digital Readout indication remains at 00 0 0 02 when ZERO lamp goes out NOTE Power Meter is now calibrated for WATT operation and zeroed on the most sensitive range KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below When A D Converter input voltage at DC test point 4 decreases to less than 0 100V after FUNCTION switch is set to STANDBY operating program branches from Under Range Subroutine address 175 to Over Under Range Con tinue Subroutine b A D Converter input voltage at DC test point is adjustable to 0 002V Set Range Calibrator RANGE switch to 30 uW and FUNCTION switch to CALI BRATE Verify that Power Meter auto ranges to range 2 uW lamp is lit and 0 decimal point is positioned immediately to left of least significant digit and Digi tal Readout indicates 31 6 0 2 uW DESCRIPTION This step verifies that the Power Meter will auto
246. rol g The diode limiter clips over range outputs of the Phase Detector to reduce the time that it takes for the Variable Low Pass Filter to respond to a full scale change in input signal level The response time of the Filter varies with the bandpass selected by the outputs of the ROM For ranges 5 4 and 3 the bandpass is 17 Hz For ranges 2 and 1 the bandpass is reduced by factors of ten to 1 7 Hz and 0 17 Hz respectively These bandpass values represent the optimum tradeoff between filter response time and signal to noise ratio On the higher ranges the gain of the Power Meter is relatively low and the 17 Hz bandpass enables the Filter to respond to a full scale change in input signal level in 0 1 second see Figure 3 7 On the lower ranges the gain of the Power Meter increases and a higher noise level is present at the output of the Phase Detector Thus a narrower bandpass is required to maintain the desired signal to noise ratio at the input of the A D Converter The time required for the Filter to respond to a full scale change in input signal level is 1 second on range 2 and ten seconds on range 1 8 118 Model 436A Service CIRCUIT DESCRIPTIONS Service Sheet 2 cont d h The DC Amplifier buffers the output of the Filter and applies it to the A D Converter for conversion to a BCD number The gain of the DC Amplifier is 1 when the CAL FACTOR switch is set to 100 The gain increases by approximately 190 for
247. rror number set to 36 BUS CMD Power Meter addressed to listen and programmed to WATT Mode trigger immediate GO SUB RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits BUS CMD false listen addresses sent to Power Meter Power Meter should not respond to dBm mode D and trigger immediate 1 programming commands BUS CMD Power Meter addressed to listen and programmed to trigger immediate 60508 RETURN Power Meter unaddressed to listen and addressed to talk calculator set up to read status S range R mode M and data D 9 digits 1470 IF THEN NO Tes 1490 GO SUB print ERROR 36 stop 1480 GO TO line 1500 1510 1520 1530 1540 1570 1550 1560 BUS CMD Power Meter addressed to listen and programmed to trigger REM remarks GO 508 RETURN output device clear ASSIGNMENT error number set to 37 BUS CMD Power Meter addressed to listen and programmed to WATT Mode range 2 trigger immediate GOSUB RETURN Power Meter unaddressed to listen and addressed to talk calculator reads status S range R mode M and data D 9 digits with settling time talk WAIT programmed delay of 200 milliseconds Figure 8 16 HP IB Verification Program HP 9830 Calculator 18 of 25 8 87 Service Model 436A 1580 IF
248. s incremented each time that C3 is discharged by 7 mV Since C3 was charged to 7 times the dc input level during the measurement function each count represents a 1 mV dc input level When C3 is fully discharged then the output of the Main Counter is equal to the original dc input in milli volts As stated previously this number represents the RF input power level applied to the Power Sensor 8 82 The operating sequence for the linear con version function is described in the following para graphs a Controller first checks the A D quali fier output of the Comparator If the qualifier is a logic one the Controller activates the LRP input to enable a positive conversion If the qualifier is a logic 0 the Controller activates the LRM input to enable a negative conversion The LRP or LRM input is then held active for the duration of the conversion b After the LRP or LRM input is activated the Controller alternately monitors the qualifier outputs of the Comparator and the Main Counter detect completion of the conversion when the Comparator qualifier changes state or when the output of the Main Counter reaches 1200 If the Comparator s output changes state before the output of the Main Counter reaches 0100 an under range conversion is detected If the output of the Comparator does not change state by the time the output of the Main Counter reaches 1200 an over range conversion is detected If the output of the
249. s can be selected as sync points for checking circuit opera tion on a step by step basis 8 123 Service Power Up 8 124 Table 8 6 Operating Program 10111 Blank Display 508 UNDER RANGE or OVER RANGE indicator will light depending on whether under over range decoder powers up in set or reset mode Count to range counter down to range O LCRD Clear main counter and set sign positive LCLR Load contents of main counter 0000 into ref erence register to clear register LL RE Display blanked count andsign O LTC Note indicates blanked digit Auto zero con verter for 8000 counts LAZ LONT Count range counter down to range 7 LCRD Count range counter down to range 5 LCRD Load mode select input into mode register LCKM Check whether local or re mote operation is selected Remote 037 8 Address 0018 Address 0344 Table 8 3 Step 1 Table 8 3 Step 1 Table 8 3 Step 1 Table 8 3 Step 1 Table 8 3 Step 1 Address 0358 Table 8 3 Step 1 Address 0358 Table 8 3 Step 1 Local Remote Branch Subroutine Address 0264 Table 8 3 Step 1 Local Remote Branch Subroutine Address 026 8 3 Step 1 Local initialize Table 8 3 Step 1 subroutine ad dress 052 for local operation Address 042 for Table 8 4 Error remote operation 3 HP IB Opt Model 436A Block Diagram Description Service
250. s output per Read Byte Subroutine starting at line 5000 Description The Power Meter is pro grammed to range 5 dBm mode and a measurement is triggered Then a talk eycle is enabled and the calculator checks the Power Meter output status Since a 1 mW RF level is applied to the Power Sensor the status output should indicate under range log mode NOTE Power Meter status output is generated by buffer ing and outputs of over under range decoder and output of mode select logic For a description of circuit operation for this test re fer to Service Sheet 3 Block Diagram Description Mode Selection and Log Under Range Registration Manually program Power Meter CMD U Check Power Meter status output per Read Byte Subroutine starting at line 5000 Error Power Meter does not provide over range status output Description The Power Meter is pro grammed to range 2 watt mode and a measurement is triggered Then a talk cycle is enabled and the calculator checks the Power Meter status output Since a 1 mW RF level is applied to the Power Sensor the status output should indicate an over range condition NOTE Power Meter status output is generated by buffer ing HOR and HUR outputs of over under range decoder and output of mode select logic For a description of circuit operation for this test
251. s selected by the preceding device clear command 36 Error Power Meter responds to in valid listen address Description The Power Meter is pro ment is triggered to load the mode select registers Then a Power Meter talk cycle is enabled to unaddress the Power Meter to listen After talk cycle false listen addresses are sent to the Power Meter followed by a dBm mode program ming command If the Power Meter is functioning properly it will not respond the dBm mode programming command because it should not be addressed to lis ten Thus it should output mode charac ter thereby indicating that it is operat ing in the watt mode Meter output status range and mode data grammed to the watt mode and a measure Turn power on and off to Power Meter Then send the following programming command to configure the Power Meter for re mote operation CMD U After the Power Meter is configured for remote operation GO TO line 1300 and use STEP key to manually execute program line by line Check that the following indications are observed a Line 1300 2430 Operating program is initialized to starting address 000g by LPU output of device clear decoder Operat ing program then cycles to Local Remote Branch Subroutine hold loop when LPU signal is terminated b Line 1330 H HOLD output of measurement rate select logic is set false by trigger immediate pro
252. shold by 1200 counts an over range condition is detected If the ramp reaches threshold between these two points in time an in range condition is detected 8 104 A D Converter Linear Under Range Regis tration Registration of a linear under range con version is described in the following paragraphs a The LRMP instruction is disabled causing the HPLS 2 clock to reset the LRP or LRM output of the A D Control Register and gates With this signal reset the LRP or LRM output of the A D Control Gates is disabled thereby terminating the conversion b The LCNT instruction is also terminated to freeze the number in the Main Counter An LCOR instruction is generated to reset the outputs of the Over Under Range Decoder d If the measurement was taken on range 1 and LTC instruction is generated to transfer the output of the Sign Latch to the Sign Display Indicator via the Display Sign Latch to load the output of the Main Counter into the Display Registers and to indicate to the Remote Interface Circuits that the measurement is completed If the measurement was taken on ranges 2 through 5 with Auto Ranging disabled an LSUR instruction is generated prior to the LTC instruc tion to enable the UR LED and HUR status outputs of the Over Under Range Decoder The UR LED output lights the front panel UNDER RANGE indicator The HUR output is gated with the HOR output by the Remote Interface Circuits to provide one of four p
253. sor s Input Amplifier and the Power Meter s First Amplifier function to gether to amplify the modulated 220 Hz signal by a factor of 600 d overall gain factor of the Second and Third Amplifiers is determined by the RANGE SELECT input to the Range and Filter Control ROM and the setting of the front panel CAL ADJ control The CAL control is normally set as required to calibrate the Power Sensor and the Power Meter to a known standard When the CAL control is set properly the outputs of the ROM configure the Attenuators such that the minimum and maximum signal levels at 2 AC are the same for each range For either Watts or dB measurements an in range input power level corresponds to a 0 3 to 3 6 Vp p signal level at A2TP3 e The Phase Detector functions as a chopper stablized amplifier to remove any noise riding on the modulated 220 Hz input Thus the output of the Phase Detector is an unfiltered de signal which is proportional to the true amplitude of the modulated 220 Hz input signal f The Meter Driver Amplifier buffers the DET output and applies it to the front panel Meter M1 via an RC filter and a diode limiter network Since the response of the meter is not limited by the Variable Low Pass Filter the meter serves to provide relatively instantaneous indications of changes in input power level Calibration of the meter to the front panel Digital Readout is accomplished via the METER ADJ cont
254. ss BIT 4 LO d 5 6 0 7 lt gt qualifier 6 If the operating program is cycling normally the NO TRIG indicator wil be off and the logic analyzer wil provide a 16 line display starting at address 0528 The first two lines of the display should indicate that the YR3 qualifier associated with address 0525 is a logic 1 and that the YR2 qualifier associated with address 055g is a logic 0 An explanation of how this status indication is derived can be found in Table 8 3 and 8 6 and in Figure 8 15 Table 8 6 indicates that the range counter was counted down to range 7 at address 0344 of the Power Up subroutine and to range 5 at address 035g Figure 8 15 shows the qualifiers associated with these addresses and how the qualifiers are processed to control address branching and instruction generation Table 8 2 436 Service TROUBLESHOOTING Standard Instrument Checkout describes the purpose and function of each qualifier and instruction Thus from the information contained in the tables and on the figure it can be determined that after the Range Counter is counted down from range 5 the Mode Register is loaded then the program branches to the Local Remote Subroutine Since Local operation is automatically selected when power is turned on the next branch is to address 0525 of the Local Initialize subroutine The Range Counter was counted down properly th
255. sually this difference will be several volts and one of the inputs wil be very close to an applied circuit operating voltage for example 20V 12V 8 29 Measure the amplifier s output voltage It will probably be close to one of the supply voltages or ground Verify that the output voltage follows the input voltages i e if the non inverting input voltage is more positive than normal and or if the inverting input voltage is more negative than Service normal then the change in output voltage should be more positive If the non inverting input is less positive and or the inverting input voltage is less negative the change in output voltage should be less positive The preceding symptoms indicate the defective component is in the external circuitry If the symptoms as stated are absent the operational amplifier is probably defective 8 30 Digital Integrated Circuits and Symbols 8 31 Introduction Except for two Read Only Memory ROM devices all digital circuits used in this instrument belong to the TTL family The two ROMs belong to the MOS family and are made TTL compatible via the use of pull up resistors attached to the input output ports Refer to Table 8 1 for TTL and MOS input output voltage level specifications and for MOS input power require ments 8 32 The symbols used in this manual conform to the requirements of American National Standard ANSI 32 14 1973 Graphic Symbols for Logic Diagrams Two
256. t 0123130 ALIALLISN3S HOSNAS SEM SUSANN ma Td MT Vin 1109842 031V8931NI n 1538 HISWAN 398333438 pne p pe Y T SNO1L03NNO2 ONNOHS AG _ 1618 0L pamon 96 122 985 ayy AS 8 SLY UMOUS 19194103 are 029 dados Um y jo suoneubiseg Ajqurassy yo Ly A30 EL j 5141 ASSV EVIV sopnjaut pejei elqe 5919 PB 698 7 Mo 0282 peur 1 18 554 AUSSE me suoneubisep 1 8291110 i 183 ETEM f 0212 gi m ON d 1 S 1200220 m SNOI VNBISSU 394333338 IPA D oee dd 43991 944 ut punaj ERAN 332A 338 3306 f 9i 8OSN3S USMOd 1984483 NO 77777 d38 0047 7777 1 E uM 52 1 502002 itu V UMOUS Due 104 UMOYS Ei 0091 AN ASHAY 7 E p ON 0212 a
257. t is stabilized at 0 316V by end of Auto Zero Subroutine 8 60 Model 436A Service Table 8 3 Standard Instrument Checkout 10 of 17 Step Instrument Setup and Test Procedure Test Description and Key Operating Sequence DESCRIPTION This step verifies that the Power Meter will auto range from range 3 to range 4 when a range 4 28 input signal level is applied Set Range Calibrator RANGE switch to 3 mW and verify that Power Meter auto ranges to range 4 decimal point moves one place to right mW remains lit KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except as indicated below A D Converter input voltage at DC test point rises to greater than 1 200V within 0 10 second after level is changed Range counter is counted up to range 4 during Over Range Subroutine program branching and instructions previously verified A D Converter input voltage at DC test point is stabilized at 0 316V by end of Auto Zero Subroutine Set Power Meter RANGE HOLD switch to on in and Range Calibrator FUNC TION switch to STANDBY Then set dBm MODE switch to on in and veri fy that indication changes as follows DESCRIPTION This step verifies that the Power Meter can be configured for dBm MODE measurements KEY OPERATING SEQUENCE Program execution and circuit operation previously
258. ted from responding to any data inputs except programming commands specifically intended for the Power Meter 8 135 Mode Programming Command Processing The Mode Clock output of the Function Decoder resets the Auto Zero Enable Logic and clocks the 1101 and 02 data bit inputs into the flip flops in the Mode Select Logic The outputs of the flip flops are then gated with the HREM input to select the operating mode for the Power Meter when remote operation is enabled HREM high and to allow front panel WIRED OR selection of this function when local operation is enabled refer to Service Sheet 3 Block Diagram Description Mode Selection 8 136 After a Mode Programming Command is loaded into the Mode Select Logic flip flops the flip flops are inhibited from changing state until a new Mode Programmming Command or an LPU input is received When a new Mode Programming Command is received the outputs of the flip flops change to reflect the new mode encoded in the command When an LPU input is received the flip flops are reset to select WATT Mode operation of the Power Meter 8 137 Range Programming Command Processing The Range Clock output of the Function Decoder resets the Auto Range Qualifier output of the Range Select Logic to disable Auto Ranging and also clocks the HIO1 1102 and 1103 data bit inputs into flip flops in the Range Select Logic The inverted outputs of the flip flop are then continuously applied to the C
259. tes 9 8 0 2 mW and that UNDER RANGE indicator lights DESCRIPTION This step verifies that the Power Meter is capable of detecting and indicating an under range condition KEY OPERATING SEQUENCE Program execution and cireuit operation previously verified except as indicated below Measurement Subroutine A D Converter input voltage at DC test point is 0 098 0 001 Ramp amplitude at RMP test point 2 is 0 696 0 014 Vp p Linear Positive Conversion Subroutine YPLS 0 detected at address 0677 delay 198 2 clock pulses 3 3 ms after start address 071 Branch to Under Range Subroutine Under Range Subroutine Light UNDER RANGE indicator Branch to Over Under Range Continue Subroutine 8 55 DEVICE 4504 Table 8 3 Standard Instrument Checkout 7 of 17 instrument Setup and Test Procedure Test Description and Key Operating Sequence Set Range Calibrator RANGE switch to 300 uW and verify that Power Meter auto ranges to range 3 refer to step 8 and that Digital Readout indicates 316 01 mW DESCRIPTION This step verifies that the Power Meter will auto range from range 4 to range 3 when the input power level is changed from a range 4 30 level to a range 3 30 level KEY OPERATING SEQUENCE Program execution and circuit operation previously verified except for range counter range 3 out put and range 3 A D
260. the ROM When this bit is low the Line Selectors are enabled and they route the status inputs selected by the YO through Y3 outputs of the ROM to the Output Gates When the 7 bit is high the Line Selectors are disabled and the YO through Y3 outputs of the ROM are buffered by the Multiplexer Gates to select the coding for data bits 1 through 4 8 151 The output of the ROM in turn is selected by the address input from the Word Counter This address is set to O at the start of each program cycle by the HLLD reset input to the Word Counter While the ROM is at address 0 its output causes the Line Selectors to route the HOR HUR and YM3 status inputs to the Output Gates to form a Word 0 ASCII character as indicated in Table 8 10 8 152 When the Power Meter is addressed to Talk the Output Gates are enabled by the high HOE 1 and HOE 2 inputs and continually route data to the HP IB The HP IB does not accept the data however until the Data Valid Status Generator provides a high HIDAV output to set the Data Valid DAV output true When this occurs each of the listeners accept the data and set the DAC line high to complete the data word transfer 8 153 After all of the listeners have accepted the data the Word Counter is clocked to the next address on the positive going edge of the LIDAV output of the Data Valid Status Generator For addresses 0 through 13 either the YO or the output of the ROM is high so a low HMDT qualifier
261. the associated display 8 51 When the RBO line is not connected to an external drive source it serves as a blanking output which is controlled by G1 As shown on the truth table in Figure 8 11 the combination of a low G1 and a binary 0 code causes the display driver to set the RBO low and to provide blanking outputs to all segments of the associated display For zero suppression the RBI G1 input associated with the most significant digit is grounded and the RBO output is connected to the input of the next significant digit Using this configuration a number such as 0010 would be displayed as 10 8 52 Numeric Display numeric display con sists of eight individual light emitting diodes LED which share a common anode input Seven of the LEDs designated a through g are arranged to form a seven segment display as shown in Figure 8 12 eighth LED designated dp provides left hand decimal point display Each segment is lighted individually by a low input to the cathode pin a through g and dp of the LEDs 8 53 Read Only Memories ROMs The Read Only Memories ROMs used in the Power Meter fall into two separate logic families TTL and MOS As shown in Figure 8 13 the only significant differences between the two types of ROMs are the power requirements and the amount of program storage The power requirements for each family are provided in Table 8 1 Storage capacity for the TTL ROM is 32 8 bit words 256 bits
262. the standard instrument circuits are known to be operating properly a fault can be readily isolated to a remote option circuit group or to that segment of the operating program associated with remote operation 8 59 Standard Instrument Checkout 8 60 A step by step procedure for verifying the operation of a standard instrument is provided in Table 8 3 Each step of the procedure directs that a specific function be verified and summarizes the program execution and or circuit operation associated with the function Each summary in 8 16 turn is based on normal indications previously obtained Thus if the steps are performed in the order listed an abnormal indication is directly related to a small segment of the operating program or to a specific circuit group The information contained on the Service Sheets and in the Operating Program Flow Chart Figure 8 15 can then be used to further isolate the problem Typical examples of using the checkout procedure as a basis for troubleshooting are listed below 8 61 Example 1 Abnormal Indication is Observed for Step 1 For this example it is assumed that the power supplies are operating normally since troubleshooting of these circuits is straightforward refer to Service Sheet 15 The first step in isolating any other type of fault is to determine whether the fault is in the ROM which contains the operating program or whether it is one of the major circuit groups shown on Service Sh
263. tine address 147 153 154 153 155 157 161 165 if 21100 counts if A D Converter output Step 28 address qualifier changes state 155 156 151 before 1100 counts 160 161 162 163 164 165 8 129 Service WLUUEL 002 Table 8 6 Operating Program Description 7 of 11 Troubleshootin Block Diagram Description Sub Routine Address Function Branch To 9 Refer to Service Title Sheet d Detect over range condi Step 31 addres tion address 164 or 167 ses 163 164 165 166 167 if A D converter output Table 8 3 Step 25 Mode Selection Table 8 3 Step 32 Table 8 3 Step 32 dB Relative except address Conversion 171 YMI branch Step 33 address 171 YM1 branch decoder LCOR Relative dB Check whether dBm mode selected Display and Remote Talk Subroutine Address 177 if dBm mode selected Address 171 if dBm mode not selected Store contents of main counter in reference register LLRE if dB REF mode selected b Load contents of refer ence register into relative counter LCOR and set NRZO qualifier logic 1 Display and Remote Talk Subroutine Address 177 Count relative counter down LREL to 0000 NRZO 0 and count main counter up or down LCNT as required to algebraically subtract reference from measured power level does not change state Table 8 3 Step 7 by 1100 counts e Clear over under range r
264. to that shown on the Operating Program Flow Chart 8 149 Talk Cycle During the Display and Remote Talk Subroutine of each program cycle the opera ting program checks whether the Power Meter is addressed to Talk If the Power Meter is addressed to Talk the LTLK input to the Remote Qualifier Multiplexer will be low and an Output Data Trans fer will be enabled as shown on Sheet 14 of Figure 8 15 Operation of the HP IB circuits when the Power Meter is addressed to talk is described in the following paragraphs a Transfer Control Gates The Talk Transfer Control Gates are enabled by the low LTLK and HATN inputs when the Power Meter is addressed to Talk and the HP IB is in the data mode While the gates are enabled they provide high HOE 1 and high HOE 2 outputs to enable the Data Valid Status Generator and the Output Gates NOTE shown Sheet 14 of Figure 8 15 the operating program will initiate an Output Data Transfer whenever the LTLK quali fier is low If the HP IB is not in the data mode however the Talk Transfer Control Gates will be disabled by the high HATN input and the resulting low HOE 2 output will set the HRFD qualifier output of the Data Valid Status Generator low Simi larly if there is no listener on the HP IB the low NRFD input also sets the HRFD qualifier low With this qualifier low the operating program will enter a hold loop until the Power Meter is unaddressed to Talk b Data Valid
265. to dB REF mode range 5 trigger with settling time CMD U 5 Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs dB REF mode 2 Range select logic outputs range 5 3 Range counter is preset to range 5 during Remote Initialize Subroutine Manually program Power Meter to dB REF mode auto range trigger with settling time CMD U C9T Verify Power Meter mode and range character output per Read Byte Subroutine starting at line 5000 Check that 1 Mode select logic outputs dB REL mode 2 Range select logic sets NAUTO output true 3 Range counter is counted down to range 1 during Power Meter operating program cycle 8 109 ME Model 436A Table 8 4 HP IB Circuit Troubleshooting 12 of 18 Prohlem and Description Corrective Action 27 Error Power Meter range mode or data output wrong Manaully program Power Meter dBm mode range 1 trigger with settling time CMD U D1T Verify Power Meter mode range and data character output per Read Byte Subroutine starting at line 5000 Data output should correspond to indication on Digital Readout previously verified for local operation Description Power Meter programmed to dBm mode range 1 trigger with set tling time Then Power Meter addressed to talk and range mode and data
266. tor address 174 c Digital Readout indication changes from Blank Digital Readout reference previously verified blanked to 31 6 1 0 mW Branch to Delay Subroutine Delay Subroutine Auto Zero A D Converter 40 000 clock pulses 666 ms Branch to Auto Zero Subroutine Auto Zero Subroutine A D Converter input voltage 4 stabilizes at 0 316 0 10V by end of Auto Zero Subroutine delay of 8000 counts 133 ms after start address 056 NOTE As previously verified UNDER RANGE indica tion is reset and Digital Readout is unblanked in first subsequent Linear Positive Conversion Subroutine 8 58 4 95 1 1 ADM Model 436A Service Instrument Setup and Test Procedure Tahle 8 3 Standard Instrument Checkout 8 of 17 Test Description and Key Operating Sequence Set Power Meter RANGE HOLD switch to on in and Range Calibrator FUNCTION switch to STANDBY Press Power Meter SENSOR ZERO switch and verify that uW lamp remains lit and that ZERO lamp lights and remains lit for approximately four sec onds Adjust ZERO OFF potentiometer as required to obtain 00 0 indication with blinking sign when ZERO lamp is lit and verify that indication remains at 00 0 00 2 when ZERO lamp goes out DESCRIPTION This step is a course adjustment of the ZERO OFF potentiometer it provides a proper reference for the spike balance adjustment performed in the next step
267. ub routine starting at line 5000 Error If ERROR 4 is printed the ne Power Meter operating cycle is not synced to the trigger with settling time programming command If ERROR 4 and ERROR 4 5 are printed the Power Meter did not respond properly to one or more of the programming commands 4 C bo RA power on and off to Power Meter then manually send the following program command CMD U T Check that the programming command configures Power Meter for remote operation and causes operating program to enter Display and Remote Talk Subroutine hold loop addresses 0225 0238 0240 0254 HOLD output of measurement rate select logic is set low by programming command and reset high by LTC instruction generated at start of Display and Remote Talk Subroutine Description 1 error number is set to 4 and the Power Meter is programmed to auto zero range 2 and trigger with settling time Thus the Power Meter should output STATUS character U during the Display and Remote Talk Subroutine thereby indicating that the auto zero loop is enabled that it is operating on some range other than one and that the input signal level is UNDER RANGE GO TO line 410 and use STEP key to execute program line by line Check that the following indications are obtained a Line 420 1 Auto zero enable logic stores auto zer
268. uts are normal use standard signal tracing techniques to isolate the problem If they re abnormal refer back to step b d If the output Amplifier Demodulator and Filter circuit is normal sync the logic analyzer on address 0714 and check whether the A D Converter qualifier goes to logic 0 at 633 160 clock pulses later If no display can be obtained on the logic analyzer turn power on and off and verify program execution starting at the Local Initialize Subroutine If an erroneous display is observed use the logic analyzer and oscilloscope to isolate the problem to the ROM containing the program the Instruction Register the A D Control Register and Gates the A D Converter or the Counters The TRIGGER OUT PUT of the logic analyzer can be used to sync the oscilloscope at any address e the conversion described in step d is proper check that an LCOR instruction is gener ated at address 072g and that an L TC instruction is generated to load the Display Register at address 1778 If both of these instructions are generated properly use standard signal tracing techniques to isolate the problem to the Under Over Range Decoder the Main Counter or the Display Assembly 8 62 Example 2 Abnormal Indication is Ob served for Step 8 This example was chosen because it illustrates Power Meter autoranging during a program cycle When the RANGE HOLD switch is released for step 8 an LCRD instruction should be gene
269. ve dB Description Remote input When HP IB option installed functions in conjunction with YRMT FAST to select measure ment rate as indicated above Remote talk I O transfer contro signal associated with HP IB option Set low at start of talk cycle to indicate that last word of data message not sent to external con troller reset high at end of talk cycle Remote input When low selects local operation of Power Meter when high selects remote operation of Power Meter Remote talk I O transfer control signal associated with HP IB option refer to description and timing dia gram provided under Principles of Operation Remote talk enable input associated with HP IB option set low by external controller to request output data from Power Meter Relative counter status output Goes low to indicate that contents of relative counter are equal to 0 INSTRUCTIONS LAZ 3 10 Power Up Local Remote Branch Remote Initialize Auto Zero Delay Display and Remote Talk LCKM 3 10 Power Up Remote Initialize Local Initialize 8 22 Sets A D auto zero register thereby enabling A D con verter auto zero loop Loads mode select bits into mode register RAL 1 7 AMMA Model 436A Service Table 8 2 Program Mnemonic Descriptions 4 of 5 Service Suhroutine Sheet Power Up Remote Initialize Auto Zero Measurement Over Under Range Continue Delay Power Up Remote Initialize Auto Zero Measurement L
270. vi 60 fr 4 p fe 5 El teg qe bur eu 8 HIlHD02 aed 1519038 2007 38H Y 138 3 324343335 Q 5214709 RIVE most li M M MM LIM td comma LIRR ASML ae PD a eee DENEN ney ett TILON x B OLY 0 4 ASSEMBLY Figure 8 36 5 Controller Assembly Component and Test Point Locations Service Model 436 SERVICE SHEET 11 CIRCUIT DESCRIPTIONS The circuits described in Service Sheet 11 covered in paragraphs 8 114 through 8 161 HP IB Instrument Checkout in paragraphs 8 63 through 8 66 Troubleshooting in Table 8 4 and HP IB Verification Programs in Figures 8 16 and 8 17 A6 ASSEMBLY CIRCUIT Figure 8 38 HP IB Option 022 Control Assembly Component and Test Point Locations 8 178 aouo xe u Px ONINNY T8 0118 us A S Par 21907 df 3 04 A 9 JAS 1 _ u31Nn02 NYE rd AS 8 gi RH es 2 si 188A 1 ON ASt A
271. ware circuits to control their operation General processing of the operating program by the Controller is illustrated in Figure 8 15 Sheets 2 and 3 In the following examples specific words are used to illustrate Controller circuit operation associated with local and remote qualifier selection A Example 1 Local Qualifier Selection Starting Address 0005 YR3 0 1 02 4 81 182 TB3 TB4 TC1 Service Qualifier instruction Next Address Select Select Select Code Code Code BIT 15 14 13121110 9876543210 Word 000 X X X 1 0 10 110000001 No qualifier associated 05 1508 001 with word 0008 1 1 Leading edge of first 01 Clock following termination of Power Up Reset LPU a Address 001g clocked into State Register and applied to State Controller b State Controller produces word 0016 Qualifier Instruction Next Address Select Select Select Code Code Code 15 14 13 1211109 8 7 6543210 Word 0019 10110 11010011010 13 083 15g LCLR 032g Line Selector produces qualifier 13g YR3 2 TA2 a YR3 qualifier logie 1 clocked into Qualifier Register and applied to State Controller State Controller address changed to 2015 Qualifier Register not clocked again until TB2 b State Controller produces word 2015 Qualifier Instruction Next Address Select Select Select Code Code Code BIT 15 14 13 12 11109 8 76
272. wer than the Controller LPU output so it does not discharge the RC networks installed at the inputs to the Reset Generator and the Remote Enable Logic Thus the function of the Device Clear Decoder LPU output is limited to reinitializing the opera ting program to starting address 000g refer to Table 8 6 and to selecting a predetermined opera ting mode and range for the Power Meter when remote operation is enabled refer to the Data Mode Programming paragraph 8 126 Interface Clear When the Interface Clear IFC input is true low the Reset Generator is enabled and provides a Reset output to the Talk and Listen Registers Thus if the Power Meter was addressed to talk or listen previously the talk or listen function is cleared Similarly when power is first turned on to the Power Meter the pulse width of the Controller LPU output is of sufficient duration to discharge the Reset Generator RC network and thereby cause a Reset output to be applied to the Talk and Listen Registers 8 127 Talker Unaddressing When the TALK ONLY NORMAL switch is set to the NORMAL position the Remote Interface Controller can unaddress the Power Meter to talk by setting the Interface Clear IFC line true refer to previous description by addressing some other instrument on the HP Interface Bus to talk or by generating a Universal Untalk Command In Table 2 2 it is shown that data bits 6 and 7 are coded the same for all valid HP IB talk addresses and
273. will increase the feedback For example if the oscillator output were to suddenly increase the peak detector s output would become more positive The comparator s output would become more positive a lower CR3 reactance would decrease the feedback to 91 which forces the oscillator s output level back to its original level If the LEVEL control were adjusted for a more positive reference voltage the comparator s output would go more negative the feedback would increase allowing the oscillator s output to increase Therefore peak detector s output would increase until it equals the comparator s reference level input thus establishing a higher leveled output signal from the oscillator Service 8 185 Service SERVICE SHEET 14 cont d Frequency shaping components R9 R10 R11 and C8 determine the upper limit of frequency re sponse of the ALC loop which prevents spurious oscillations 5V Power Supply A8A1VR2 provides a reference voltage of 6 2 to the power supply reference amplifier A8U1 The gain of the reference amplifier is set by R3 R4 and R5 and is approximately 0 8 with R3 centered The very stable output is coupled through CR1 as the reference voltage input to comparator U2 Diode CRI provides temperature compensation for CR2 TROUBLESHOOTING General Before trying to troubleshoot A8A1 Assembly verify the presence of 15 Vdc and 15 on the circuit board If defect t
274. worst case access time to the first output data character is 70 ms Thus the calcula tor should detect STAT 13 3 Model 436A Service Table 8 4 Circuit Troubleshooting 17 of 18 Problem and Description Error Power Meter data output wrong when CAL control is adjusted to ob tain 799 mW indication on front panel Digital Readout Description The test number is set to 1 and the Power Meter is programmed to range 3 free run at maximum rate CAL FACTOR switch disabled 100 Then the Power Meter is addressed to talk and the output data is checked after each talk cycle If the output data does not indicate 799 mW within 300 talk cycles an error is detected Error Power Meter data output wrong when CAL control is adjusted to obtain 866 mW indication on front panel Digital Readout Description The test number is set to 1 and the Power Meter continues to free run at the maximum rate on watt mode range 3 Since the Power Meter is still addressed to talk it outputs data during each talk cycle and the calculator checks to see if the data indicates 866 mW If the output data does not indicate 866 mW within 300 talk cycles an error is detected Error Device clear command does not disable CAL FACTOR switch Description The verification program and the CAL ADJ control is adjusted to obtain a 1 000 mW indication on the front panel digital readout Power Meter

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