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HP 8505A User's Manual

1. Figure A2 21 CRT Trace of Phase Transition Figure A2 22 Hysteresis Loop of Phase Trace d Set SCAN TIME SEC to MANUAL Sweep through the transition in both forward and reverse direction using the Manual sweep control Note the hysteresis loop asshown in Figure A2 22 e Adjust both CW FREQUENCY and AF FREQUENCY to make the hysteresis loop six divisions wide and centered on the vertical center line of CRT See Figure A2 22 NOTE Hf either step f or g is out of tolerance refer to Section V for adjust ment of A3A12 Phase Detector A2 34 Model 85054 A2 57 PHASE ACCURACY AND ELECTRICAL LENGTH TEST Cont d f Press Channel 1 DISPLAY MKR Center trace dot on the vertical center line at point A on Figure A2 22 trace The marker readout should be 180 degrees 3 3 degrees Center trace dot on the vertical center line at point B on Figure A2 22 trace The Channel marker readout should be 180 degrees 3 3 degrees ELECTRICAL LENGTH LINE STRETCHER TEST h Remove extra 24 inch cable and adapter and reconnect Port A to the three way power splitter through one of the matched cables i On Frequency Control set RANGE MHZ ie py ee 0 5 1300 MHz MODE ote rb PIC Ux LIN EXPAND remet AF 4AF FREQUENCY cbs ne eRe alan 0 MHz CW FREQUENCY read on FREQ COUNT
2. APPLICATION NOTE 219 NOVEMBER 1978 HEWLETT E PACKARD INTRODUCTION cg Overview 85054 test sets and control functions TRANSMISSION MEASUREMENTS 2 15 Setup calibration and measurement sequences for Insertion Loss and Gain Insertion Phase Electrical Length Deviation from Linear Phase Group Delay REFLECTION MEASUREMENTS 22 Setup calibration and measurement sequences for Return Loss SWR Reflection Coefficient POWER LEVEL MEASUREMENTS 25 Measure the absolute power at the R A and B inputs S PARAMETER MEASUREMENTS 26 Setup calibrate and measure S11 S21 8 and S5 using the 8503A S Parameter Test Set THE 8501A STORAGE NORMALIZER 30 Use the Digital Storage Labels Averaging Magnification and Normalization features of the 8501A to enhance 8505A measurement capabilities CONTROLS AND DISPLAYS SUMMARY 33 summary of the functions of the 8505A controls and displays p This application note will help you make transmission and reflection measurements with the Hewlett Packard Model 8505A RF Network Analyzer and its associated test sets Previous ex perience in network analysis techniques is assumed so the note concentrates on generalized setup calibration and measurement sequences rather than basic measurement theory
3. a equ Xon acu itte Midrange Installation A2 29 Installation Model 8505A A2 56 MAGNITUDE PHASE AND GROUP DELAY FREQUENCY RESPONSE Cont d On A3 Signal Processor Channel 1 INPUT ova SEU R MODES Cea CP DL MAG SCALBJIDIV xus ke e deu Clap te temque 0 5 dB DIV Channel 2 MODE bee i US OFF CRT Display REP LINE POSN wy e Eurer Center Graticule Line BW Looss dice uA xa R3 Wa GN ROC ao 10 kHz On in VIDEO PILTER o oa bee ELS Off out b Connect equipment as shown in Figure A2 18 with INPUT cable connected di rectly to RF OUTPUT connector Press DISPLAY CLR MKR then ZRO pushbuttons Observe the highest and lowest point on the CRT trace between 0 5 and 1300 MHz They should not be greater than 3 dB difference If the CRT trace is within tolerance go to step h and check input port If port has been checked go to step i and check B input port If the CRT trace is out of tolerance go to step d and cancel the affect of the RF source variations to see if the receiver section is actually within tolerance d Connect equipment as shown in Figure A2 18 with RF OUTPUT to center of Power Splitter and one leg of power splitter to port R and the other leg to Power Sensor and Power Meter e Set Marker 1 to the point on CRT trace that is maximum Note Marker reading and Power Meter reading f
4. HP 8496A PROCEDURE a 85054 set the controls as follows On Al Source Converter OUTPUT LEVEL dBm ii ccc tenet ence wees ees 0 OUTPUT LEVEL 0 cscs hh 0 INPUT LEVEL dBm 00 e cece eee eees 10 On A2 Frequency Control RANGE MHZ Re A eee 5 13 MODE et LIN EXPAND WADE Hig antec afin cman ie Les ere aes eia CW CW FREQUENCY dehet rut ene bene 30 0 MHz A2 25 Installation A2 54 MAGNITUDE DYNAMIC ACCURACY TEST Cont d On A3 Signal Processor Channel 1 DU RAM x R MODE ette em AU ete ee Ye ed MAG Leve er GEH Vo EDITAE 5dB Channel 2 MODE oot PURA Electrical Length MODE PTS OFF Display Section BANDWIDTH KHz 10 kHz ON in REF LINE POSN Ref line to center graticule line VIDEO EIETER euet itat ee roce ry ae d ON in b Connect equipment as shown in Figure A2 16 Model 8505A Set step attenuator to 30 dB Press Channel 1 DISPLAY MKR then ZRO push buttons until trace settles Press CHAN 1 DISPLAY REF pushbutton As attenuator is stepped down offset 10 dB step with Channel 1 REF OFFSET pushbutton to bring trace back to reference line within limits shown in Table A2 6 It may be necessary to change CHAN 1 SCALE DIV to a less se
5. positions using the FREQUENCY MHz displays and FREQUENCY controls To familiarize yourself with operation of the sweeper frequency controls follow this sequence Select LOG FULL or LIN FULL and cartesian display Down pointing markers are displayed ac cording to WIDTH WIDTH to START STOP 1 Position markers using START and STOP FREQUENCY controls WIDTH to START STOP 2 Position markers using START and STOP FREQUENCY controls WIDTH to CW AF Set AF markers using AF FREQUENCY control center AF markers on area of interest using CW FREQUENCY control Set MODE to LIN EXPAND and select scan using WIDTH FREQUENCY controls are All frequency markers are shown here operative in all WIDTH positions except ALT actually only the selected markers are displayed LIN EXPAND START STOP 1 START STOP 2 In LOG FULL the full selected frequency range is swept with a logarithmic frequency axis The log sweep end points are identified above the RANGE MHz switch and log frequency graticule overlays are available LIN FULL selects a linear sweep of the full selected frequency range 500 kHz to 13 130 or 1300 MHz In the full sweep modes selecting one of the START STOP or places two down pointing frequency m
6. VR UR T INE RR NEN 10ms 25ms 300 ms 1000 ms 3000 ms At least 3 sweep times per channel 3000 ms 3000 ms 20ms 1 sweep Channel 25 ms 2sweeps Channel 100 ms 20ms 120 ms 1000 ms first freq 360 ms next freq VERNIER CONTROL PRESET POSITION Output Level 10 Scan time Vernier Scan time min Frequency 2 0 Position MAX CCW Electrical Length 0 Position MAX CCW Serial Poll Enable HP IB Octal 030 Serial Poll Disable HP IB Octal 031 Service Request If the Serial Poll is enabled the Source wili Service Request if loss of phase lock or RF input overload occurs Bit 6 of the Status Byte will also refresh this An initial Serial Poll after power on will enable the Service Request Pass Control The 8505A does not have the ability to Pass Control or take Control Abort The 8505A does not respond to the Abort message For more information call your local HP Sales Office or nearest Regional Office Eastern 301 258 2000 Midwestern 312 255 9800 Southern 404 955 1500 Western 213 877 1282 Canadian 416 678 9430 Ask the operator for instrument sales Or write Hewlett Packard 1501 Page Mill Road Palo Alto CA 94304 In Europe Hewlett Packard S A 7 rue du Bois du Lan Box CH 1217 Meyrin 2 Geneva Switzerland In Japan Yokogawa Hewlett Packard Ltd 29 21 Takaido Higashi 3 chome Suginami ku Tokyo 168 5952 9293 PRINTED IN USA
7. __ Model 8505A Installation 2 PLACES DO 2 PLACES HP Part Description 9220 2732 FOAM PADS TOP CORNER BOTTOM CORNER 9211 2729 CARTON INNER 5021 1722 BARS SHIPPING ALUMINUM 2510 0061 SCREW FOR ATTACHING SHIPPING BARS 9211 2730 CARTON OUTER 9220 2715 SIDE PADS CORRUGATED CARDBOARD NOTE Quantities given are for two containers Figure A2 10 Packaging for Shipment Using Factory Packaging Materials 2 15 Installation Model 8505A Table A2 4 List of Equipment Required for Incoming Inspection Test Instrument Critical Specifications Recommended Model Electronic Counter Power Meter and Sensor 0 110 dB Step Attenuator 3 Way Power Splitter Matched Coaxial Cables Set of 3 50 Ohm Termina tion 3 Required Type N to BNC Adapter 2 required 15 24 plus Meters 50 plus feet of Coaxial Cable 10 dB Attenuator A2 16 Frequency Range to 10 MHz Accuracy tl count Sensitivity 5 dBm Power Range 10 to 20 dBm Frequency Range 0 5 to 1300 MHz Accuracy 0 5 dB at 1300 MHz Attenuation 0 to 110 dB in 10 dB increments Frequency Calibrated at 30 MHz SWR 1 5 Connectors Type N Male Impedance 50 Ohms Frequency Range 0 5 to 1300 MHz Connectors Type N Female Frequency Response Input to output lt 0 2 dB 50 ohm double shielded coaxial cables 61 cm 24 inches
8. you become familiar with operation of the instrument you can modify and extend these sequences to more specialized applications The first part of this note introduces the 8505A and the standard test sets then describes the main operations to make measurements The Transmission Measurements Reflection Measurements Power Level Measurements and S Parameter Measurements sections contain specific step by step sequences used to make particular measurements on a device If you have a device to measure go directly to one of these sequences and try it Use the Introduction as a reference for operations that require more explanation A section for the 8501A Storage Nor malizer provides a brief description of how to use this important accessory foldout at the rear of this note presents a photo of the 8505A front panel and a summary of the functions of the controls indicators and displays Learn by doing Use the 8505A to measure a device with known characteristics You will bet ter appreciate the ease with which measurements are made if you have access to an 8505A with test set from the very beginning But during the interval prior to arrival of your 8505A you can develop valuable background knowledge of instrument operation from this note Although the 8505A is fully programmable via the HP IB this note does not describe programming opera tions It is recommended that you gain a good understanding of the 8505A in manual operation before w
9. HEWLETT iy PACKARD OPERATING AND SERVICE MANUAL 8505A NETWORK ANALYZER 500 kHz to 1 3 GHz SERIAL NUMBERS This manual applies directly to HP Model 8505A Network Analyzers with serial number prefix 1930A For instruments with serial number lower than 1930A refer to the Manual Changes section of each chapter Copyright HEWLETT PACKARD COMPANY 1976 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CALIFORNIA 95404 U S A MANUAL PART NO 08505 90072 Microfiche Part No 08505 90073 Printed AUGUST 1979 CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Com pany will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by HP Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer Howeve
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11. ye XiP OUTPUTS sw x x x x X Xx x x xj x x x x Channel 2 MODE E PHASE A R or DELAY A R RearPanel 9 vi vi vi v1 vil vi vi 0 RECORDER CH2 Y2 2 Y2 Y2 0 ve vel 0 OUTPUTS 5 X X X Channel 2 MODE B R or DELAY B R Rear Panel CH1 0 O vi v1 vi vi vil o RECORDER CH2 Y2 Y2 Y2 O 90 v2 OUTPUTS swR X x X X X1 X X x xi x T Channel 2 MODE POLAR A R or POLAR B R Rear Panel Y2P Y2P Y2P Yi Y2P Yi Y2P vil yop vi 2 vir RECORDER CH2 X2P X2P 0 X2P 0 X2P 0 0 x 0 1 OUTPUTS SWR X2P x X Xz X x Xap 2 14 Abbreviations Recorder outputs are multiplexed between channel 1 and channel 2 for certain combinations of mode and input settings This causes the m puts to change on alternate sweeps from channel 1 to channel 2 If the entries in the table for 1 and 2 are the same the outputs are the sam for each sweep However if the entries are different for 1 and 2 the outputs are different for alternate sweeps X Rectangular X both channels X1P Polar X channel 1 X2P Polar X channel 2 Yi Rectangular Y channel 1 Y2 Rectangular Y channel 2 Y1P Polar Y channel 1 Y2P Polar Y channel 2 9 Invalid Output
12. 2 F r2 seconds at each INPUT position Read the power at the R A PR P and B inputs from the CRT display by assuming that the iii 5 reference line is 0 dBm and noting the trace position with 4 L 2 respect to the reference line p Cartesian Display For the polar display reflection and transmission coefficient values can be read directly from the polar graticule For magnitude ratio the beam center position is the point of zero 90 Degrees reflection coefficient infinite dB return loss and zero transmis gt sion coefficient infinite dB insertion loss The outer circle is the magnitude ratio reference line having a linear coefficient value corresponding to the SCALE DIV POLAR FULL selection At POLAR FULL 1 and zero dB REF OFFSET the outer circle represents a reflection coefficient magnitude of 1 0 dB return loss and transmission coefficient magnitude of 1 0 dB insertion loss For phase angle the zero degrees reference line is the right hand intersection of the center line and the concentric circles and is scaled from zero to 180 degrees 180 Degrees INTRODUCTION SET FREQUENCY SWEEP Frequency sweep is controlled by the RANGE MHz MODE and WIDTH switches RANGE MHz selects the frequency range MODE selects logarithmic or linear full sweep or the linear expanded sweep selected by WIDTH You can set and store an independent expanded sweep at each of the WIDTH switch START STOP 1 START STOP 2 and
13. number code 31 41 43 45 47 Processor Programming Conventions C10 ddddd C20 ddddd C30 ddd E 2 i t 1 codes be sent any order 57 67 77 85 The duplicate controls for each display Source Learn String 30 characters channel require that the following prefix codes be used Od Rd Md Wa A Td d FAdddd FBdddd ES C1 for all CHANNEL 1 codes 02 for all CHANNEL 2 codes 2 4 6 8 10 2 14 18 2 3o HEWLETT PACKARD CO 1979 HEWLETT PACKARD FOCUS INTENSITY ro BW vipeo 10 kiz LYER SCALE Xon ew 5 oo REF LINE POSN CENTER B C COBA NOT PROGRAMMABLE oT REF OFFSET DISPLAY LENGTH DISPLAY 5 5 ferr fa ri xs ABS La exeo 7 eise v INPUT a INPUT a m E MODE m Poan OFF MAG PHASE DLY MAG PHASE ori MODE LENGTH PHASE OK ICUSCAN CD 335 SCALE DIV y ur s do In 1100 PROCESSOR PROGRAMMING CODES FUNCTION AND COMMENT IF and VIDEO filter selection CHANNEL code must precede the other codes used the channel C1 codes are the same as C2 codes INPUT id MODE Md SCALE DIV Sd REFerence OFFSET ddddd STORED CALIBRATION Ox ddddd
14. 85024 Transmission Reflection Test Set Transmission and reflection measurements on two port devices which require measurement of both forward and reverse characteristics can be accomplished easily using the 85034 509 or 8503B 750 S Parameter Test Set With this test set and included cables measurement of both forward and reverse characteristics be accomplished without disconnecting and reversing the test de DC bias connec tions for transistor testing are provided 8503A S Parameter Test Set 500 RF Input 500 16 70 500 ANN ANY o 500 11850A 500 9 5 dB Loss Each Path 750 RF Input 500 750 AAA 750 2 30 118508 750 7 8 dB Loss Each Path Input 6 dB DC Bias DC R Bias A Bias INTRODUCTION INTRODUCTORY MEASUREMENT SEQUENCE With a basic understanding of the instrument and these test sets in mind follow this typical operating se quence for measuring transmission insertion loss or gain Use a bandpass filter or similar device with known characteristics If you are not in front of an instrument use the foldout at the rear of this note to locate the con trols This introductory sequence assumes measurements are made using the 8502 test set or an 8503 test set with the front panel S PARAMETER SELECT switch set to FORWARD Connect Test Sei See connection diagram Do not connect the test device Freq Control Sig Processor Inter C
15. 85054 set controls as follows On Al Source Converter OUTPUT LEVEL dBHEC ee em e e er eR NR 10 OUTPUT LEVEL VERNIER 025 Sewer ecce aad 0 INPUT LEVEL dBm MAX 0 ec e nn 10 On 2 Frequency Control RANGE MHZ osse tuu res eee Soa eee eke 5 130 MODE ee LIN EXPAND s Lue ROSE COR ERE ok Fac e Re SCAN TIME SEC RR ER Ede eee 1 01 CW FREQUENCY oop oe gene SER et 30 MHz tAF FREQUENCY recived snime tnaa n n nn 00 0 MARKERS AK ix eate go eee i Marker 1 A2 27 Installation Model 8505A A2 55 PHASE DYNAMIC RANGE Cont d On A3 Signal Processor Channel 1 acct crt He e er ded ERO pO MOERS SCALE DIV se Rep ee aM AUR ERA 1 degree Channel 2 MODE OBS eO OFF Electrical Length MODE dede heme cep OUR OFF Display Section BANDWIDTH KHz ceo Re Y 10 kHz On in VIDEO FILTER rater ects eU Pme ERR des On in REF LINE POSN Adjust Reference Line to CRT center graticule line b Connect equipment as shown in Figure A2 17 c Set external step attenuator to 10 dB If OVERLOAD light comes on adjust OUTPUT LEVEL VERNIER to clear overload Press Channel 1 DISPLAY MKR then ZRO pushbuttons to place the CRT trace on the cen
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17. 0 3 dB from 0 5 MHz to 10 100 1000 Frequency MHz Dynamic Accuracy t 0 01 dB dB from 20 to 40 dBm 0 2 dB from 10 to 50 dBm 0 5 dB from 50 to 70 dBm 0 dB from 70 to 90 dBm 2 0 dB from 90 to 100 dBm 4 0 dB from 100 to 110 dBm Heo General Information Model 8505A Table Al 1 85054 Network Analyzer Performance Specifications 2 of 3 r Crosstalk Error Limits 100 dB isolation between inputs EIE T 5 0 148 E 5 5 H E 0 001 dB i 0 01 10 7307 7250 70 50 Measurement Channel input Level in dBm Reference Offset Range 199 9 dB Accuracy 0 03 dB 0 003 dB dB of offset Resolution Marker Measurement 0 01 dB over any lt 10 dB range 0 1 dB for 210 dB range CRT Display 0 1 dB to 20 dB division in 1 2 5 sequence PHASE CHARACTERISTICS Frequency Response 3 from 500 kHz to 750 MHz 5 from 750 MHz to 1 3 GHz Frequency MHz Range 180 Accuracy 0 01 degree for 5170 0 017 degree 50 5 for 180 Dynamic Accuracy in 10 kHz Bandwidth 0 02 dB from 20 to 40 dBm 0 5 from 10 to 50 dBm from 50 to 70 dBm 3 from 70 to 90 dBm 10 30 50 70 90 310 input Level in dBm Crosstalk See amplitude crosstalk specifications Reference
18. 30 t9 DUUM PROSE POWER PROBE POWER FREQUENCY FREQUENCY VERNIER RANGE MHz LOG 140 11000 DN 5130 51300 MANUAL 100 101 701 WIDTH STARTISTOP D 2 tar LOG LIN TULL FULL EXPAND SCAN TIME SEC TRIGGER AUTO LINE EXT SINGLE 9 MIN COUNTER R SOLUTION rd SOURCE PROGRAMMING CODES FUNCTION AND COMMENT START FREQUENCY and CW STOP FREQUENCY and AF Leading zeros are ignored Decimal position is not programmed It is shown below to give implied position The range of frequencies for Range and Mode settings are shown below 1 Range Modet Mode 2 amp 3 bs 1 1000MHz 1 1300 MHz 2 1 100 0 MHz 5 130 0 MHz 1 1 10 00 MHz 5 13 00 MHz Vernier controls default to min CCW when Local Lockout is set When in Mode 4 the units for FB change FREQUENCY COUNTER Only one marker available in remote Set marker dd to percentage of sweep width between 00 and 99 HP IB FUNCTION AND COMMENT CODE zi OUTPUT LEVEL dBm 10 dB steps od VERNIER Local Lockout required to program Setting not on Learn String 99 V 12 12 V Vernier in INPUT LEVEL dddd RANGE MHz sweep PHASE LOCK WIDTH SCAN TIME SEC Vernier S defaults to min Scan Time when Local Lockout is set TRIGGER Td to
19. HP 5020 8862 Attach 2 on each side of instrument 1 P P ilo zu PAN HEAD Machine Screw P 2 8 32 0 375 o E 2510 0193 e 6 places on each lt side of instrument s 4 ee s AP 22 7 F OPTION 909 FLAT RACK MOUNTING KIT Pa a WITH FRONT 8 32 x 0 375 HANDLES HP 2510 0195 LEFT ma N INSTRUMENT P SE S oe P HP 5061 0083 FRONT HANDLE Trim Strip HP 5020 8896 RACK FLANGE HP 5020 8874 2 places on each side of instrument PAN HEAD Machine Screw 8 32 x 0 625 HP 2510 0194 6 places on each side of instrument 4 v e e N a Remove these flat machine screws and trim strips if handles already on instrument ead Installation FRONT OF INSTRUMENT FRONT OF INSTRUMENT FRONT HANDLE ASSEMBLY HP 5060 9899 THESE ITEMS SUPPLIED WITH OPTION 907 FRONT HANDLES KIT IF INSTRUMENT ALREADY HAS FRONT HANDLES ORDER JUST THE PAN HEAD MACHINE SCREWS 2510 0194 AND FLANGES 5020 8874 Figure A2 2 Attaching Rack Mounting Hardware and Handles A2 3 Installation A2 11 PRE OPERATION SET UP A2 12 Power Requirements A2 13 The Model 8505A requires power source of 100 120 220 or 240 Vac 5 10 50 to 60 Hz single phase Power Consumption is approximately 275 watts A2 14
20. Select fast scan time to inspect most significant digits and slower scan time to inspect least significant digits ELECTRICAL LENGTH Display shows equivalent electrical length or linear insertion phase added to reference channel to equalize electrical length in reference and A and B test signal paths depending upon IN PUT MODE selections LENGTH buttons increment the displayed value CLR momentary zeros display CLR hold until REL out clears stored calibration ZRO stores displaved value as calibration and zeros display CHANNEL 1 and CHANNEL 2 Two identical independent measurement channels INPUT and MODE select measurement trace displayed on CRT LED displays show the reference line value REF button pressed or measurement marker displacement from reference line MKR button pressed Measured value at marker is sum of REF and values REF OFFSET buttons increment the reference line value stored in separate magnitude phase and delay reference offset registers for each channel CLR momentary resets the reference line value to zero CLR held until REL out clears stored reference offset calibration ZRO stores the calibration reference offset for selected measurement 33 sod pue Jayy AouenboJ4 p eoujooer SAV IdSIG S IOXLNOO s e dsig pue 10044 9098
21. Test To Input Connections to the test set and test device are made using the cables supplied in the 11851A Cable Kit The test device input port is connected to the 8502 front panel TEST connector For transmission calibration the cable which connects to the device output is connected to the 8502 TEST output Whatever configuration is used all cables adapters and fixtures required for the measurement should also be used for calibration 15 TRANSMISSION MEASUREMENTS INSERTION LOSS AND GAIN This sequence lists the steps for a typical insertion loss or gain measurement WETTER SETUP Set signal levels Set frequency sweep Set CRT display MARKERS 1 position measurement marker so FREQ COUNTER MHz reads desired calibration frequency CALIBRATION Connect through CHANNEL 1 B R MAG 10 dB division MKR ZRO hold until display zero MEASUREMENT Connect test device MKR ZRO moves marker to reference line Position measurement marker to read magnitude ratio REF and frequency B Es NER ee Calibration for insertion loss and gain measurement sets the magnitude ratio between the transmitted and reference signals to zero dB with the through connection After connecting the test device a negative measured value indicates insertion loss a positive measured value indicates gain Take care to choose signal levels to achieve maximum dynamic range see page 6 This figure s
22. if the measured magnitude ratio is 30 dB is 0 032 and the SWR is 1 07 23 REFLECTION MEASUREMENTS REFLECTION COEFFICIENT This sequence lists the steps for a typical reflection coefficient measurement SETUP Set signal levels Set frequency sweep Set CRT display polar beam center MARKERS 1 position measurement marker so FREQ COUNTER MHz reads desired calibration frequency CALIBRATION Connect short CHANNEL 1 A R POLAR MAG POLAR FULL 1 MKR ZRO hold until display zero ELECTRICAL LENGTH A MODE as required usually x1 or x10 CLR if REL lighted LENGTH and VERNIER A for smallest cluster CHANNEL 1 POLAR PHASE MKR ZRO hold until display zero REF REF OFFSET so display reads 180 degrees ZRO 4 MKR MKR ZRO moves marker to zero degrees MEASUREMENT reference line Connect test device Electrical length MODE and sweep width if PHASE x10 SCAN selected same as calibration Read p lt at any point from polar display or POLAR MAG Position measurement markers to read magnitude ratio MKR REF and frequency REF OFFSET and REF ZRO moves marker to Calculate p using 120 sii return loss dB Prest Turies pi 10 where D NP POLAR PHASE Read lt value REF Press Twice MKR MKR DEG FREQ COUNTER MHz Impedance Using Smith Chart 15 0 Impedance can be read directly from the polar display reflec tion c
23. to 1300 MHz Reflection 11 22 2 dB 20 from 0 5 to 1300 MHz 15 from 2 to 1300 MHz Port Match 8503A Test Port 1 and 2 228 dB Return Loss from 2 to 1000 MHz gt 26 dB Return Loss from 1000 to 1300 MHz 1 11 SWR 220 dB Return Loss from 0 5 to 2 MHz 1 22 SWR 85038 Test Port 1 and 2 224 dB Return Loss from 2 to 1300 MHz gt 18 dB Return Loss from 0 5 to 2 MHz 85034 Test Port 1 and 2 Open Short Ratio 0 75 dB Magnitude and 6 from 2 to 1000 MHz 0 9 dB Magnitude and 7 5 from 1000 MHz to 1300 MHz 1 25 dB Magnitude 10 Phase from 0 5 to 2 MHz 85038 Test Port 1 and 2 Open Short Ratio lt 0 9 dB Magnitude and 7 5 from 2 to 1300 MHz lt 1 25 dB Magnitude 10 from 0 5 to 2 MHz Reference and Return Ports 223 dB Return Loss from 2 to 1000 MHz lt 1 15 SWR 220 dB Return Loss from 0 5 to 2 MHz and 1000 to 1300 MHz 1 22 SWR RF Input Port 220 dB Return Loss from 0 5 to 1300 MHz lt 1 22 SWR Tracking Between Reference and Test Port 1 and 2 Transmission S21 12 lt 0 5 dB Magnitude and Phase Reflection S11 522 0 75 dB Magnitude and lt 6 Phase RF Input to Test Port 1 or 2 1 5 dB Insertion Loss Input to Port 1 and 2 13 dB Nominal Input to Port A B or R 19 dB Nominal Maximum Operating Level 20 dBm Damage Level 1 watt CW Connectors Test Ports APC 7 All Other RF Ports 50 Type N Female DC Bias
24. 20 dBm Damage Level gt 1 watt CW RF Attenuator Range 0 to 70 dB in 10 dB steps DC Bias Input Range 30 V dc 200 mA some degradation of RF specification 0 5 to 100 MHz 500 mA maximum RF Connectors 8502A 50 Type Female 8502B Test Port 75 Type N Female all other RF connec tors 50 Q Type N Female DC Bias Input Connector BNC Female Includes 8502B includes a 50 Q to 75 Q minimum loss pad 11852A Recommended Accessory 11851A Cable Kit 11853A 50 N Accessory Kit for 8502A 11855A 75 N Accessory Kit for 8502B Dimensions 101 mm wide 61 5 mm high 204 mm deep 74 in x 2 7 16 in x 8 in Weight Net 1 7 kg 3 3 4 Ib Shipping 3 1 kg 7 1b 1 Tentative specification for 8502B 2 degrees specified as deviation from linear phase 3 Other ports terminated in their characteristic impedance 11851A RF CABLE KIT Function Provides the necessary RF interconnections and RF shielding required for 8505 A Network Ana lyzer measurements when using the 8502A 85028 Transmission Reflection Test Sets or the 11850A 11850B Power Splitters Kit includes Three 61 24 in 50 Q cables phase matched to 4 at 1 3 GHz and one 86 cm 34 in Connectors 50 Q Type N Male Weight Net 0 91 kg 2 Ib Shipping 1 36 kg 3 Ib General Information Model 8505A Table A1 3 Test Sets and Accessories 2 of 7 11850A 50 POWER SPLITTER 118508 75 PO
25. ANALYZER Shown with Option 907 Front Handles INTERCONNECT CABLE 08505 60231 NOTE The foilowing accessories supplied with the 8505A are not shown 1 Smith and Log Chart CRT Overlays 2 AC Power Cable 3 Board Extenders 4 See Accessories Supplied Paragraph A 1 40 Figure 1 1 Model 8505A Network Analyzer 1 0 Model 8505A General Information CHAPTER MODEL 8505A NETWORK ANALYZER SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 The Model 8505A Network Analyzer comprises three functionally separate but physi cally integrated major assemblies RF Source Converter Assembly Al Frequency Con trol Assembly A2 and Signal Processor Assembly A3 Al A2 and A3 are reference designators used to identify these assemblies throughout the manual The building block approach used in construction of the 8505A is also used in the ar rangement of the manual Chapter A is divided into six sections containing information pertaining to the entire 8505A This includes specifications operating instructions performance tests ad justments and sufficient theory and troubleshoot ing data to enable you to isolate a malfunction to a particular one of the three major assemblies Al 3 Chapters B C and D each cover one major assembly Chapter B the Source Converter Assembly Al Chapter C the Frequency Control Assembly A2 and Chapter D the Signal Processor Assemb
26. Cables Two AC Power Cables Two AC Power Cables 8120 1351 or 8120 1369 or 8120 1689 or 8120 0698 One Set Smith and Log Chart CRT Overlays One 8505A Operating Instructions Sheet One 12 Pin Dual 6 Pin Extender Board Two 30 Pin Dual 15 Pin Extender Board One 36 Pin Dual 18 Pin Extender Board One 50 Pin Dual 25 Pin Extender Board 08505 60154 08505 90074 08505 60109 08505 60041 08505 60042 08505 60108 Power cable supplied depends on configuration of ac power receptacle at user s location Y type cable connects to both top and bottom units of 8505A Model 8505A General Information Table 1 1 85054 Network Analyzer Performance Specifications 1 of 3 SOURCE FREQUENCY CHARACTERISTICS Frequency Range 500 kHz to 1 3 GHz in three ranges 500 kHz to 13 MHz 500 kHz to 130 MHz and 500 kHz to 1 3 GHz Swept Frequency Accuracy 1 of range for linear sweep CW Frequency Accuracy 2 counts time base accuracy Frequency Stability better than 0 01 of reading 0 01 of frequency range over 10 minutes after warm up FREQUENCY COUNTER CHARACTERISTICS Frequency counter measurements are made at any one of five continuously variable marker positions without interrupting the swept RF signal Accuracy Counter 2 counts time base accuracy Marker Frequency 0 002 o
27. KHz IF bandwidth and 30 Hz post detection video filter to smooth trace x OUTPUT Sweeper output at RF connector is sum of step attenuator and VERNIER settings REFERENCE AND TEST INPUTS Three identical inputs for absolute or ratio measurements Each input has a measurement range from 10 dBm to 110 dBm Slide switch selects maximum input level applied at A and B inputs for linear operation OVERLOAD indicators above inputs light when level exceeded FREQUENCY SCAN CONTROLS AND DISPLAYS RANGE MHz selects frequency range MODE selects log and linear scans of full range or linear expanded scans selected by WIDTH With MODE in LOG FULL or LIN FULL WIDTH selections display down pointing markers to identify end points of stored frequency displayed by the FREQUENCY MHz displays and set by the FREQUENCY controls Moving MODE to LIN EXPAND selects the frequency stored for the WIDTH selection MEASUREMENT MARKERS The rotary MARKERS switch selects measurement marker 1 through 5 The ad jacent numbered vernier controls marker position on trace The FREQ COUNTER MHz display is blank when the measurement is not accurate At positions 2 thorough 5 deselected markers point down the selected marker points up FREQUENCY COUNTER Displays frequency of measurement marker selected by MARKERS Resolution is controlled by RANGE MHz and SCAN TIME SEC OVERFLOW indicates one or more most significant digits are shifted off left of display
28. Programming string see Chapter A Section ll of the 8505A Operating and 2 and units are reduced by a factor of 10 Service Manual HP part No 08505 90072 when in W4 with phase lock option DATA Reading the 8505A The Processor MARKER values may both be read by reading them into two variables The units are the same as displayed on the front panel LEDs The 8505A consists of two separately programmed in struments Processor and Source 8505A Instrument Conventions 1 Program letter codes must be uppercase leading The Counter marker value is obtained by reading the zeros and spaces are ignored source into a variable The units are in HZ 2 Any controls not programmed will assume their front panel state as positioned before remote The current state of many of the 8505A controls may 3 The switches are programmed using two be output using the Learn Mode program L then character format read on a properly dimensioned string a The first character is a letter corresponding to switch name example for range T b The second character is a number Processor Learn String 85 Characters corresponding to the position of the switch 4 beginning with 1 at the left or CCW position Sa R dadog cald sd c Other controls have the same alpha numeric P 9 AP A 15 25 27 o sequence but may use a two letter code a pius or m nus sign and up to a 5 digit F ddddd Gald Me d
29. R A or B mu OVERLOAD indicator on the dark panel above the switch will light to show that the input signal is near the compression point for the input mixer and measurement errors may result The switch is normally set at the 10 position When making measurements in which the A or B inputs are below about 80 dBm and the R input is below 30 dBm set the INPUT LEVEL dBm MAX switch to the 30 position Selecting 30 increases the signal level into the detectors and adds appropriate display compensa thus reducing the magnitude phase and delay measurement uncertainties for low signal level measurements Signal Level Considerations Minimum measurement uncertainty is achieved when the in 10 put levels are near maximum For example when the test input drops from 20 dBm to 100 dBm the magnitude ratio uncer 20 tainty increases from 0 01 dB to 4 0 dB The R A and B in puts are identical each with 10 dBm to 110 dBm of range 30 thus allowing measurements to be made with 100 dB dynamic range But for best results in ratio measurements the test input 40 should be above 110 dBm for magnitude 100 dBm for phase and 90 dBm for delay reference input level should remain constant for calibra tion and measurement The test input level at calibration deter mines the gain and insertion loss range available for measure ment without overload or excessive measurement uncertainty Two
30. S Octal 123 2 18 Cable Connections A2 19 cable connections to the 8505A ex cept those to the device under test are made at the rear panels The rear panel connectors and their reference designators are shown in Figure A2 5 Model 8505A A2 20 Power Cable WARNING If this instrument is to be energized through an autotransformer make sure the common terminal of the au totransformer is connected to the protective earth contact of the power source outlet socket The protective earth terminals of the 8505A must be Installation connected through the protective conductor of the power cable to the power source outlet socket protec tive earth contact This protection must not be negated through the use of an extension cord power cable without a protective ground conduc tor Any interruption of the protective ground inside or outside the 85054A can make the 8505A a dangerous electric shock hazard RECEPTACLE FOR PRIMARY POWER CORD PC SELECTOR BOARD SHOWN POSITIONED FOR 115 120 VAC POWER LINE OPERATING VOLTAGE APPEARS IN MODULE WINDOW SELECTION OF OPERATING VOLTAGE SLIDE OPEN POWER MODULE COVER DOOR AND PUSH FUSE PULL LEVER TO LEFT TO REMOVE FUSE PULL OUT VOLTAGE SELECTOR PC BOARD POSITION PC BOARD SO THAT VOLTAGE NEAREST ACTUAL LINE VOLTAGE LEVEL WILL APPEAR IN MODULE WINDOW PUSH BOARD BACK INTO ITS SLOT PUSH FUSE PULL LEVER INTO ITS NORMAL RIGHT HAND POSITI
31. Set Marker 1 to the point on CRT trace that is minimum Adjust OUTPUT LEVEL VERNIER and step attenuator to set Power Meter to the same indication noted in step e g difference between the Marker indication noted in step e and the displayed marker reading in step f should be lt 3 dB h Disconnect RF Cable from R INPUT and connect to A INPUT Set Signal Proces sor Channel 1 INPUT switch to A Repeat preceding step c and observe the power level variations for INPUT i Disconnect RF Cable from INPUT and connect to B INPUT Set Signal Proces sor Channel 1 INPUT switch to B Repeat preceding step c and observe the power level variations for B INPUT A2 30 Model 8505A A2 56 MAGNITUDE PHASE AND GROUP DELAY FREQUENCY RESPONSE Cont d 8505A NETWORK ANALYZER RF OUTPUT MATCHED COAXIAL CABLES POWER SPLITTER Figure A2 19 Ratio Frequency Response Test Setup EQUIPMENT Three way POWER HP 11850A Matched Cable Ki c cesis d EIEE eye eh E HP 11851A RATIO MEASUREMENT MAGNITUDE FREQUENCY RESPONSE p Connect equipment as shown in Figure A2 19 with the power splitter connected to R and B inputs and Power Meter disconnected from setup On A2 Frequency Control set RANGE MHz switch to 0 5 1300 MHz position set MODE to LIN FULL WIDTH to START STOP 1 SCAN TIME SEC to 1 1 and TRIGGER to AUTO Set MARKERS switch to 1 position and Mar
32. The range of numbers for R and 0 is 19999 The plus sign is im plied and leading zeros ignored Decimal position is not programmed It is shown below to give implied position ddddd Phase degrees Delay 1300 MHz ns Magnitude dB Delay 13 MHz us Delay 130 MHz us DISPLAY D3 when programmed Dd clears only to clear enter O0 Non learned programming code The range for values of d are shown on corresponding control in illustration above FUNCTION AND COMMENT ELECTRICAL LENGTH code must precede the other codes in C3 INPUT MODE ELECTRICAL LENGTH Stored Electrical Length The range of numbers for and is 199 The plus sign is implied and leading zeros ignored Decimal position is not programmed It is shown below to give implied position ddd Source Metric Range Mode Scale m cm m m 1 3 61 PO C CO 2 3 2 DISPLAY D2 when programmed does not clear stored Length to clear this enter OO Non Learned programming code DVERNIERA C3 Md Rz 0x ddd Mode of unselected input only on Learn string characters 44 and 45 Non Programmable Terminator used to end and separate all R O and D program statements Sd OUTPUT LEVEL an VERNIER 2 s zr o INPUT INPUT LEVEL MAX 10
33. Type N Coaxial Cables 3 required 50 Ohm Termina tion 3 required 10 dB Attenuator 50 Ohm Feed through Termination Type N Female Short BNC to Type N Adapter 2 required 12 Pin Dual 6 Pin Extender Board Calibrated Step Attenuator AC Probe Coaxial Step Attenuator General Information Table 1 4 Recommended Test Equipment 2 of 3 Instrument Critical Specifications Use pue M a HP 11850A Impedance 50 ohms Freq Range 500 kHz to 1 3 GHz Connectors Type N female Freq Response Input to output lt 0 2 dB HP 8502A No substitution 11851A 50 ohm double shielded coaxial cables 61 cm 24 inches long phase matched to 2 at 1300 MHz HP 909A Freq Range 500 kHz to 1 3 GHz 012 Impedance 50 ohms Connector Type N male SWR lt 14 HP 84918 Attenuation 10 dB 0 5 dB SWR 1 3 HP 10100C Connector BNC P HP 11511A P HP 1250 0780 Impedance 50 ohms P HP 08505 60109 H89 355D Attenuation 0 to 120 dB in 10 dB steps Standards lab calibrated at 20 MHz Connectors BNC HP 1121A No substitution 8496A Attenuation 0 to 110 dB in 10 dB increments SWR 1 5 Connectors Type N male 1 17 General Information Instrument 30 Pin Dual 15 Pin Extender Board 2 required 36 Pin Dual 18 Pin Extender Board 3 required 50 Pin Dual 25 Pin Extender Board 182 88 cm 72 inches Coaxial Cable with Ty
34. calibration standard for reflection measurements is normally a short circuit connected at the measure ment plane the point at which the test device will be connected Complete reflection calibration sets the magnitude ratio between the reflected and reference signals to unity 0 dB equalizes any electrical length dif ference between the reflected and reference signal paths and sets the phase to 180 degrees This establishes the reflection coefficient of the test set as 14 180 the theoretical value for a short circuit Calibration values are stored in independent Stored Reference Offset registers one for each measurement category Thus you can perform calibration for transmission and reflection magnitude phase and delay in se quence prior to measurement Calibration values are shared by CHANNEL 1 and CHANNEL 2 so calibration us ing one measurement channel serves for both Also calibration values for magnitude and phase are shared by the cartesian and polar display modes so calibration using one display mode serves for both Calibration values remain stored for as long as power is applied to the instrument or until manually cleared or changed ZRO buttons for CHANNEL 1 and CHANNEL 2 provide the magnitude phase and delay calibration function Operation of the ZRO button depends upon the MKR or REF display mode selection The MKR ZRO sequence is used to establish a zero reference as for magnitude transmission phase and delay calibrations
35. com pletely clears 8501A memory of all stored information Labels Select LABELS ON Sweep mode and frequencies appear at the bottom of the CRT and measurement mode selections including the MKR value appear at the top of the CRT 8505A Channel 1 and or Channel 2 MODE switches must be set to other than OFF for the labels to appear 30 8501 STORAGE NORMALIZER Averagiug Both accuracy and resolution are improved when averaging is used to remove random noise variations from measurements To use averaging select ERASE momentary Channel 1 and or Channel 2 AVERAGING ON AVERAGING FACTOR as required Noisy Group Delay Measurement 8501A averaging acts as a digital video filter performing an exponential running average on the data at each frequency point The current trace has the weight 1 1 n and the new trace has the weight 1 n where n is the selected AVERAGING FAC TOR Select an averaging factor appropriate for the sweep rate and degree of signal to noise improvement desired noting that 2n sweeps are required to converge to 86 of the final value and sweeps are required to reach 98 Signal to noise im provement increases with Yn These CRT photos illustrate the improvement in group delay After Averaging measurement accuracy obtained by averaging Magnification High resolution displays at up to 0 01 dB 0 1 degree and 0 1 nanosecond per division are accomplished using the MAGNIFIER switch to ex
36. examples are shown in this chart Example 1 represents calibration levels for a passive device with both reference and test inputs at 10 dBm When calibrated at this level the 8505 can measure the test device magnitude ratio to over 100 dB in sertion loss Example 2 represents calibration signal levels for an active device It shows the reference level set to 10 dBm and the test channel set to 50 dBm At these levels the 110 magnitude ratio can be measured to 40 dB of gain and 0 over Note Floor EO BW 60 dB for insertion loss Power Level At Input dBm 100 At low signal levels measurement uncertainty is seen as noise on the CRT trace Select the 1 kHz IF bandwidth the 1 KHz button to the right of the CRT to reduce the pre detection bandwidth and improve the signal to noise ratio into the detectors Select the VIDEO FILTER to reduce the post detection bandwidth and thus reduce the residual uncertainty caused by detector noise Slower scan time may be required 6 INTRODUCTION SELECT MEASUREMENT The CHANNEL 1 and CHANNEL 2 MODE and INPUT swit INPUT ches function independently to select the measurement SUBE displayed on the CRT This illustration shows the display for aes mat and measurement selected for each combination of MODE MODE p POLAR and INPUT switch settings for either channel when the R input OFF MAG PHASE DLY PHASE is the reference the A input is the re
37. long phase matched to 4 at 1300 MHz Connectors Type N Male Frequency Range 0 5 1300 MHz Impedance 50 Ohms Connectors Type N Male SWR 1 4 50 ohm type RG 223 U coaxial cable with BNC male connectors on both ends Attenuation 10 dB 0 5 dB SWR lt 1 3 5340A HP 435A 8482A HP 8496A HP 11850A 11851A HP 909A Option 012 HP 1250 0780 HP 8491B Option 010 Model 8505A Installation 8505A NETWORK ANALYZER MATCHED COAXIAL CABLES 3 Required 0 110 dB STEP ATTENUATOR EL 50 FT COAXIAL CABLE 3 WAY POWER SPLITTER ELECTRONIC COUNTER POWER SENSOR 50 OHM TERMINATIONS 3 Required Eo 1 10 dB ATTENUATOR TYPE N TO BNC ADAPTERS 2 Required CE Figure A2 11 Equipment Required for Incoming Inspection Test A2 17 Installation Model 8505A A2 51 FREOUENCY RANGE AND ACCURACY TEST NOTE Allow one hour warm up time before making the incoming inspection SPECIFICATIONS Mode Accuracy 2 counts of LSD time base accuracy Swept Frequency Accuracy 1 of range for linear sweep Counter Accuracy 2 counts time base accuracy Time base Accuracy 5 ppm 1 ppm C 3 ppm 90 days DESCRIPTION The 8505A built in frequency counter calib
38. polar beam center MARKERS 1 position measurement marker so FREQ COUNTER MHz reads desired calibration frequency FORWARD TRANSMISSION S Electrical Length and Group Delay MKR ZRO moves marker to outer circle Select 8503 FORWARD Connect through CHANNEL 1 B R POLAR MAG POLAR FULL 1 MKR ZRO hold until display zero ELECTRICAL LENGTH B MODE as required CLR if REL lighted LENGTH and VERNIER B for smallest cluster ZRO CHANNEL 1 POLAR PHASE ZRO hold until display zero DLY ZRO hold until display zero 4 INPUT REFLECTION 5 MKR ZRO moves marker to zero degrees Connect forward short reference line CHANNEL 1 A R POLAR MAG ZRO hold until display zero ELECTRICAL LENGTH A CLR if REL lighted LENGTH and VERNIER A for smallest cluster ZRO MKR ZRO moves marker to reference line CHANNEL 1 POLAR PHASE ZRO hold until display zero REF REF OFFSET so display reads 180 degrees ZRO 4 MKR REVERSE TRANSMISSION 5 REF OFFSET ag coco marker to Use above FORWARD TRANSMISSION sequence Press qe except select 8503 REVERSE change CHANNEL 1 B R to A R and change ELECTRICAL LENGTH B to A OUTPUT REFLECTION 5 Use above INPUT REFLECTION sequence except connect short on output port change CHANNEL 1 Press Twice A R to B R and change ELECTRICAL LENGTH AtoB 1 REF OFFSET 4 28 5 MEASUREMENTS The meas
39. various manual op erating modes and to give you a step by step sequence of operations to make specific measure ments on a device A3 6 If you are interested in the operation of specific controls on the 8505A go to Figures A3 1 through A3 4 In these figures the function of each control is described in detail A3 7 Remote Operation and Programming A3 8 The HP 8505A has a remote programming interface using the Hewlett Packard Interface Bus HP IB All measurements that can be taken by the standard 8505A Network Analyzer can be automatically programmed and controlled re motely via the HP IB This provides a remote op erator with the same control of the instrument as does a manual local operator Remote control is maintained by a system controller desk top computer etc that sends commands or instruc tions to and receives data from the 8505 using the HP IB The HP IB is Hewlett Packard s imple mentation of the IEEE Standard 488 1975 A complete general description of the HP IB is pro vided in the manual entitled Condensed Descrip tion of the Hewlett Packard Interface Bus HP Part Number 59401 90030 A3 9 Programming information for the 85054 is given in Paragraph A3 14 and on Specific exam ples are given for HPL and BASIC languages the HP 9825A Desk top Computer in HPL and the HP 9830A B in BASIC A table of HP IB commands together with sample command statements are given in Table A3 I A glossary of HP IB
40. 5 Using the 8503A S Parameter Test Set with the 8505A you can measure both forward and reverse transmission and reflec tion characteristics without disconnecting the test device This illustration shows a typical 8505A 8503A installation Use the 19 cm Type N cables supplied with the 8503A to connect RF R A and B on the 8505A and 85034 front panels 5 M 8 5 Be sure to connect the supplied test set interconnection cable between the 8505A TEST SET INTER CONN connector on the rear of the signal processor and the SIGNAL PROCESSOR INTER CONNECT connector on the rear of the 85034 test set RF Output Forward RF Output Reverse The 8503A front panel FORWARD REVERSE control switches the incident RF to Port 1 for FORWARD or Port 2 for reverse These illustrations show the functions of the 8505A R A and B connections in FORWARD and REVERSE R R Reference Reference 5 5 6 dB Reflected Transmitted Transmitted Reflected RF 6 dB 6 dB 6dB 6 dB 6 dB Coupling Couplin Coupling Coupling Sed c D OST 6 dB Device 6 dB 6 dB Device 6 dB Port 1 Port 2 Port 1 Port 2 N Bridge Bias Bridge Bias Bridge Bias Bridge Bias 1 2 1 2 Forward Incident wave at Port 1 Reverse Incident wave at Port 2 With these connections the forward input and reverse output parameters as follows FORWARD 5 B R Forward Transmissio
41. 505A Press Electrical Length DISPLAY CLR pushbutton Set A2 Frequency Control CW FREQUENCY and VERNIER for 700 00 MHz Press Channel 1 DISPLAY MKR pushbutton then ZRO pushbutton to zero the digital readout On A2 Frequency Control adjust CW FREQUENCY up in frequency until the marker digital readout again indicates 0 degrees Record frequency for use in later calculation NOTE The phase change between the two zero points is 360 degrees Frequency Calculate the group delay of the Test Cable Phase change in degrees t D 360 X Change in Frequency in Hz EXAMPLE Change in Phase 360 degrees Change in Frequency 713 MHz 700 MHz 13 MHz tp 360 degrees 2 1 360 13 X 106 Hz 13 X 106 Hz 7718 MHz Model 8505A A2 58 GROUP DELAY ACCURACY TEST Cont d Installation b Connect equipment as shown in Figure A2 24 with both matched cables and adapters connected to power splitter and test cable not connected in circuit 85054 set controls as follows On 1 Source Converter OUTPUT EEVEL aae eoe bv tas RE 10 OUTPUT LEVEL VERNIER mere 0 INPUT LEVEL dBm 10 On A2 Frequency Control RANGE MHZ So eRe Aa ols ga a 0 5 1300 MODE A DUIS LIN FULL tas START STOP 1 SCAN TIME SEC duck m yc JT c 1 1 SCAN TIME VERNIER Fully clockwise MARKERS eU RAN Iud
42. 8 Straight NEMA6 15P E 250V 8120 1860 Straight CEE22 VI E Part number shown for plug is industry identifier for plug only Number shown for cable is HP Part Number for complete cable including plug Earth Ground L Line N Neutral Figure A2 6 AC Power Plug Connectors and Power Cable Part Numbers A2 9 Installation 2 25 Hewlett Packard Interface Bus Cables CAUTION Do not mate HP IB silver and black fasteners to each other This device is equipped with metric thread fasteners colored black To avoid damaging the threads mate only with other metric threaded devices English threaded fast eners are colored silver A2 26 When the 8505A is used in automatic mode and is being controlled through the Hewlett Packard Interface Bus HP IB the HP IB intercon nect cables are connected as follows The 0 5 metre cable HP 10631D is connected between 2 10 on Frequency Control and A3J11 on Signal Proces sor Another HP IB cable is connected in piggy back fashion to one of the connectors and the other end connected to the desk top computer test set or other instrument in the system Signal lines in the HP IB cables are identified in Figure 2 7 A2 27 As many as 15 instruments can be con nected in parallel on the Hewlett Packard Interface bus To achieve design performance on the bus proper voltage levels and timing relationships must be maintained If the system cable is too long or
43. 820A 1804A HP 3490A HP 3312A HP 8568A HP 8640A B HP 5210A HP 3400A HP 10514A HP 08640 60506 HP 08505 60155 HP 08505 60156 used using an 8640A B 5210A etc Al 16 Critical Specifications Freq Range 400 kHz to 5 52 GHz Accuracy 1 count Sensitivity 5 dBm Freq Range 500 kHz to 1300 MHz Power Range 20 to 60 dBm Accuracy 0 5 dB at 1300 MHz Freq Range 500 kHz to 5 5 GHz Impedance 50 ohms Dynamic Range 60 dB Frequency identification capability Vertical Bandwidth 20 MHz minimum Vertical Sensitivity 5 mV Div Horizontal Sweep Rate 1 us Div Channels 4 with 1804A plug in AC Range 0 to 300V 50 to 400 Hz DC Range 0 to 200V Accuracy 5 Resolution to 5 digits Output 1V p p square wave 10 kHz and 100 kHz Adjustable DC offset Freq Range to 1300 mHz Residual FM lt 3 Hz peak to peak Frequency 5 500 MHz Residual FM lt 5 Hz Must have internal 12 kHz filter True RMS Response 1 mV 1V 10 Hz to 10 MHz Frequency Range 7 MHz to 500 MHz Input Output Impedance 50 ohms Low Frequency Response 20 4 Hz Noise lt 3 dB Impedance 50 ohms Type 5 pole Butterworth Impedance 50 ohms Type 5 pole Butterworth If a Model HP 8568A Spectrum Analyzer is not available to make Spectral Purity tests an alternate procedure may be Model 8505A Recommended Model 3 Way Power Splitter 50 Ohm Trans mission Reflection Test Set Matched
44. ANEL OF BOTTOM UNIT BOTTOM UNIT Figure A2 1 Lock Feet Left Side A2 9 RACK MOUNTING mounting kit Option 909 includes both the rack mounting hardware and the front handles A2 10 Two rack mounting kits are available for Parts supplied with the two kits are listed in Table the 8505A One Option 908 is for 8505 A s that do A2 1 the manner in which these parts attach to the not have or need front handles The other rack 8505A is shown in Figure A2 2 Table A2 1 Rack Mounting Kits for 8505A Description HP Part Number OPTION 908 HP 5061 0077 Includes Rack Flange 5020 8862 Machine Screw Pan Head 2510 0193 8 32 x 0 375 inch Option 909 HP 5061 0083 Includes Handle Assembly 5060 9899 Rack Flange 5020 8874 Machine Screw Pan Head 2510 0194 8 32 x 0 625 inch NOTE Rack mounting kits and other options are shipped with the instrument as part of the original order only they are not supplied separately If you already have an 8505A and want to add the optional equipment order the kit assemblies attach ing hardware or other materials you need by their HP Part Numbers rather than by option number from your nearest HP office A2 2 Model 8505A OPTION 908 RACK MOUNTING KIT WITHOUT FRONT HANDLES HP 5061 0077 SIDE TRIM STRIP HP 5001 0438 LEFT SIDE 2 places each side INSTRUMENT of instrument REMOVE FROM INSTRUMENT BEFORE ATTACHING RACK FLANGE FLANGE
45. B insertion loss or gain Connect Test Device See connection diagram Read Measured Value Use the MARKERS 1 vernier to position the measurement marker to any point on the trace If necessary to position the trace for viewing use the CH1 control or the CHANNEL 1 REF OFFSET but tons A moves trace up V moves trace down Read the frequency at the measurement marker from the FREQ COUNTER MHz display Press the CHANNEL 1 REF button to display value of the reference line then press MKR to display marker displacement from the reference line The measured value dB is the sum of the REF and MKR values The following paragraphs describe the functions of the controls used in these steps in more detail 5 INTRODUCTION SET SIGNAL LEVELS Set Sweeper Output Level The OUTPUT LEVEL attenuator and VERNIER set the OC LEVEL dim sweeper output level at the RF connector to any level from 10 to 72 dBm The sum of the rotary switch and the VERNIER setting is the RF output level 1 dB If the OUTPUT controls are set to 30 and 6 then the level at the RF connector will be 36 1 dBm Set Reference aud Test Channels Input Level The maximum signal level which can be applied to the R A INPUT or B inputs is either 10 dBm or 30 dBm depending upon the iNFOT TEVEL INPUT LEVEL dBm MAX switch setting If the signal level at dBm 10 30 any input is greater than the switch setting the
46. Bit 4 Positions 6 and 7 are spares and disconnected on board Figure A2 4 HP IB Address Switch A2 7 Installation 11 HP IB CABLE 0 5 METRES HP 10631D 2310 234 HP IB TO OTHER INSTRUMENTS Model 8505A A3J8 5 A3J6 A3J9 A3J7 A3J10 A215 A2J6 FREQ CONTROL SIGNAL PROCESSOR INTERCONNECT CABLE HP PART NUMBER 08505 60231 NOTE ON 8505A NETWORK ANALYZERS HAVING SERIAL NUMBER PREFIXES 1544A AND LOWER POSITIONS OF FRE QUENCY CONTROL INTERCONNECT RECEPTACLE A3J2 AND NORMALIZER INTERCONNECT RECEPTABLE A3J1 ARE REVERSED SO THAT A3J2 IS LOCATED NEXT TO HP IB CONNECTOR A3J11 Figure A2 5 85054 Rear Panel Connectors A2 21 In compliance with international safety standards this instrument is equipped with a three wire power cable When connected to a properly in stalled power line outlet this cable grounds the 8505A chassis Figure A2 6 shows the different kinds of mains plugs available for the power cable supplied with the 8505A The number shown under each plug is the HP part number for the 8505A power cable with that particular kind of mains plug A2 22 The power cable supplied with the 8505A is selected to be compatible with power line outlet sockets in the country of destination the cable you receive does not fit your power line outlet sockets refer to Figure A2 6 to deter A2 8 mine which cable is the correct one Order the requir
47. CH UNTIL THEY UNLATCH WINDOW 2 REMOVE WINDOW BY PULLING OUT ON LOCK TAB Figure 2 13 Frequency Control Front Panel Window Removal Table A2 5 Frequency Accuracy Table RANGE MHz Switch Set At A2 Frequency Control START and STOP FREQUENCY Digital Readout Set At A2 Frequency Control Frequency Indicated On Internal Freq Counter 5 1300 5 130 5 13 5 1300 5 130 5 13 A2 20 1300 MHz 130 0 MHz 13 00 MHz 0100 MHz 010 0 MHz 01 00 MHz 1300 MHz 13 MHz 130 0 MHz 1 3 MHz 13 00 MHz 0 13 MHz 0100 MHz 13 MHz 010 0 MHz 1 3 MHz 01 00 MHz 0 13 MHz Model 8505A Installation A b2 POWER OUTPUT LEVELING TEST AND ABSOLUTE POWER CALIBRATION SPECIFICATION Power Output Range 10 dBm to 72 dBm Attenuator Accuracy 1 5 dB over the 70 dB range Output Leveling 0 5 dB from 0 5 to 1300 MHz Output Level Vernier Accuracy 1 dB DESCRIPTION The power output is measured directly with a power meter The power output is monitored on a power meter while the frequency band is tuned with CW FREQUENCY control The highest and lowest power spots are noted and the total difference must be less than the specification 8505A NETWORK ANALYZER METER POWER SENSOR Figure A2 14 Power Output Range Test Setup EQUIPMENT Power Metern REVERSA Crete 435 coca n DOOR Vi Rar VR VR HP 8482A P
48. CH USE A2 8 Forbench use the two chassis units of the 8505A are locked together with the lower unit sitting on the bench or on an 8503A S Parameter Test Set On the rear corners of each chassis unit there are feet which allow the units to be set down front panel up as long as no cables are connected to the rear panel connectors The bottom two feet on the Signal Processor and display unit and the upper two feet on the Source Converter Frequency Control unit fasten together with thumbscrews to lock the two units together at the rear See Figure A2 1 In the front four hook shaped flanges on the top of the lower unit engage corresponding slots in the top unit To fasten the two units together proceed as follows Set the Signal Processor on top of the Source Converter Frequency Control with the front edge of the Signal Processor over lapping the front edge of the bottom unit ap proximately 1 4 inch b Slide the top unit back until its front edge is even with the front edge of the lower unit This should lock the fronts of the two units together Make sure they are locked by lifting up on the front of the top unit Tighten the thumb screws on the bottom rear feet of the top unit into the top rear feet of the bottom unit A2 1 Installation Model 8505A REAR PANEL OF 7 77 BOTTOM LEFT TOP UNIT REAR LOCK FOOT OF TOP UNIT THUMB SCREW TIGHTEN TO LOCK TOP LEFT REAR LOCK FOOT OF REAR P
49. ENTER button CHANNEL 2 MODE OFF CHANNEL 1 R MAG Use SCALE DIV switch or press REF OFFSET to move CRT trace away from reference line CH1 to position reference line CHANNEL 1 POLAR MAG POL and POL to center beam CHANNEL 1 MODE OFF CHANNEL 2 R MAG CH2 to position reference line Press to release REF LINE POSN BEAM CENTER may be left depressed es cate Shad eas ERN I MET sie nee For the cartesian display the reference line is the position from which SCALE DIV expands or contracts the trace The Scale Div value of the reference line is initially zero dB degrees or UE seconds and the trace is positioned above or below the te ba reference line depending upon whether the response F6 p3 characteristic is positive or negative p The reference line can be set to any position on the CRT at gt ee any time using the CH1 and CH2 4 controls without disturb 2 ing the calibration values To continue the previous exercise press to detent the REF aay LINE POSN BEAM CENTER button and move the reference line Lia L7 to the center CRT graticule line Connect the test set and set 12 6 CHANNEL 1 or CHANNEL 2 INPUT to A or B and set MODE SEPA to MAG If the REL indicator near the measured value display is Lc La lit press and hold the CLR button until REL goes out
50. ER MHz panel 1000 MHz On Signal Processor set Channel 1 INPUT ue De AE ae eR A R tale SCALE DIV POLAR FULL 1 CRT Display BW 10 kHz On in VIDEO FILTER Saco tr Selec Off out j At ELECTRICAL LENGTH panel set INPUT uccide ep gu RE re ttes ee SE MODE LENGTH RAW ide X10 VERNIER 0 fully counterclockwise DISPLAY CLR ii Paka Press and release k On Channel 1 press DISPLAY MKR then ZRO pushbuttons Set Channel 1 MODE Switch to POLAR PHASE then press DISPLAY ZRO This should place the trace dot within 3 mm of the outside circle and zero degrees l Press ELECTRICAL LENGTH pushbuttons to add 30 cm length The trace dot should move around the outside circle back to 0 degrees 10 degrees m Set ELECTRICAL LENGTH MODE switch to LENGTH X1 position Press ELECTRI CAL LENGTH pushbuttons to read 15 cm The trace dot should be at 180 degrees 5 degrees The same indication appearing on the CRT should appear on the Chan nel 1 digital readout LINEAR PHASE RANGE n Set Channel 1 MODE to PHASE and SCALE DIV to 90 degrees On A2 Frequency Control set SCAN TIME SEC switch to 0 1 01 Set ELECTRICAL LENGTH MODE switch to PHASE X10 degrees SCAN Press Channel 1 DISPLAY REF then CLR and pre
51. FREQ COUNTER MHz reads desired calibration frequency CALIBRATION Connect through CHANNEL 1 B R DLY 100 nanoseconds division MKR ZRO hold until display zero MEASUREMENT Connect test device MKR ZRO moves marker to reference line Position measurement marker to read group delay MKR REF and frequency device with no phase distortion presents a linear insertion phase characteristic Group delay will thus ap pear as a flat horizontal line This figure shows that group delay varies as a function of frequency when the test device exhibits deviation from linear phase Non Linear ag Linear buo Phase Angle Phase Angle Group Delay Group Delay t f f2 With slow sweep times or narrow frequency sweeps the instrument switches from the continuous mode to a sample mode n order to maintain the best signal to noise ratio for the measurement Maximum sample rate is 1000 samples per second If the test device bandwidth will permit fast sweeps increase the sweep speed until the instrument switches to the analog mode then slow the sweep speed until just before the switch to sampling If not slow to 1 sec sweep and use the sample mode with video filtering Continuous Mode For best accuracy Sample Mode Fast sweep means a small Sampie Mode For best accuracy slow slow sweep until just before sampling number of large samples to less than one second per sweep T
52. IFICATION Crosstalk Error Limits gt 100 dB isolation between inputs Noise floor in 10 kHz Bandwidth 95 dBm 0 5 to 2 MHz 100 dBm 2 to 10 MHz 110 dBm 10 to 1300 MHz DESCRIPTION The noise floor is measured by offsetting the reference line 95 dB 0 5 to 2 MHz 100dB 2 to 10 MHz and 110 dB 10 to 1300 MHz In the Crosstalk Isolation test a signal of 10 dBm is applied to the R Channel input The A and B Channels are terminated and the signal is displayed on the CRT The displayed signal of Channel A should be 100 dB below the 10 dBm level of the R port showing isolation between ports The other ports are checked in the same manner 8505A NETWORK ANALYZER RF OUTPUT 500 TERMINATIONS Figure A 2 15 Crosstalk Isolation and Noise Floor Test Setup EQUIPMENT 50 Ohm Termination 3 HP 909A Option 012 A2 22 Model 8505A Installation A2 53 CROSSTALK ISOLATION AND RECEIVER NOISE FLOOR Cont d PROCEDURE a Connect equipment as shown in Figure A4 15 with the three terminations on A B and R ports b Set 8505A Controls as follows On Source Converter OUTPUT LEVEL dBm 60 dBm OUTPUT LEVEL VERNIER 0 dB INPUT LEVEL dBm MAX 30 dBm On A2 Frequency Control RANGE MH2 US nie pM E S 0 5 13 MODE vies vitse deo LIN EXPAND sist
53. INEAR PHASE ACCURACY s On ELECTRICAL LENGTH panel set MODE switch to PHASE X 10 degrees SCAN set VERNIER A to zero then press DISPLAY CLR pushbutton t Channel 1 set MODE switch to PHASE Press DISPLAY REF then CLR push buttons Press MKR then ZRO pushbuttons Press DISPLAY REF then REF OFF SET pushbuttons to place 180 degrees of offset in Channel 1 u On ELECTRICAL LENGTH panel press LENGTH pushbutton to obtain two com plete phase cycles on the CRT screen The ELECTRICAL LENGTH digital readout should be 72 2 corresponding to 720 degrees 20 degrees of electrical length A2 36 Model 8505A Installation A2 58 GROUP DELAY ACCURACY TEST SPECIFICATIONS Group Delay Accuracy lt 3 of reading 1 ns for 0 5 to 1300 MHz range or 10 ns for 0 5 to 130 MHz range or 100 ns for 0 5 to 13 MHz range DESCRIPTION A 50 foot coaxial cable is measured for group delay using the phase function of 8505A The group delay mode is then used to measure the 50 foot cable to obtain a direct group delay reading 8505A NETWORK ANALYZER aw MATCHED COAXIAL CABLES POWER SPLITTER TEST CABLE gt 80 FT COAXIAL CABLE Figure A2 24 Test Setup to Measure Group Delay of Test Cable EQUIPMENT 3 Way Power 9 HP 11850A Matched Type N Coaxial Cables HP 11851A dest Cables d diy gina pF RN qaa 250 foot of coaxial cable RG 223 u or sim
54. Inputs BNC Female DC Bias Input Range 30 Vdc 200 mA some deg radation of RF specifications 0 5 to 100 MHz 500 mA maximum Includes Four 19 cm 7 in cables with Type N Male connectors for connection to 8505A Recommended Accessory 11857A Test Port Extension Cables Power Selection of 100 120 220 or 240V 5 10 50 or 60 Hz approximately 10 watts Dimensions 432 mm wide 90 mm high 495 mm deep 17 x 3 in x 194 in Weight Net 9 1 kg 20 Ib Shipping 11 3 kg 25 1b 1 Degrees specified as deviation from Linear Phase Effective Port match for ratio measurement General Information Model 8505A Table A1 3 Test Sets and Accessories 4 of 7 11857A B C Function Two precision cables extend the 8503A test TEST PORT EXTENSION CABLES ports for convenient measurement of devices having any two port geometry Kit Includes Two 61 cm 24 in cables phase matched to 2 at 1 3 GHz Connectors APC 7 Weight Net 0 91 kg 2 1b Shipping 1 36 kg 3 Ib 1118574 is 50 ohm cable with APC 7 connectors 11857B is 75 ohm cable with Type N 75 ohm male connectors on one end and Type N 75 ohm female connectors on the other end 11857C is 75 ohm cable with Type N 75 ohm male connectors on one end and GR 900 75 ohm connectors on the other end Package Styles Option 001 Through line microstrip P P O plastic and bolt in grounding structure machinable by customer for special pack
55. Kit Function The 11853A furnishes the RF components generally required when using the 8502A 11850A and 8503A 8503A requires 850324 also when measuring devices having 50 Q Type N connectors The characteristics of the components in this kit insure high quality RF measurements for those devices having 50 2 Type N connectors Kit Includes Qty Description 1 Type N Female short circuit 1 Type N Male short circuit 2 Type N Male Barrel 2 Type N Female Barrel 1 Storage Case Dimensions 254 mm wide 64 mm high 191 mm deep 10 x 2 in x 7 in Weight Net 0 91 kg 2 Ib Shipping 1 36 kg 3 Ib 11854A 50 BNC Accessory Kit Function The 11854A furnishes the RF components generally required when using the 8502A 118504 and 8503A 8503A requires the 850324 also when measuring devices having 50 BNC connectors The charact ristics of the components in this kit insure high quality RF measurements for those devices having 50 62 BNC connectors Kit Includes Oty Description N Male to BNC Female adapter Type N Male to BNC Male adapter Type N Female to BNC Male adapter Type N Female to BNC Female adapter BNC Male short circuit H Storage Case Dimensions 254 mm wide 64 mm high 191 mm deep 10 in x 2 in x 7 in A Weight Net 1 13 kg 212 Ib Shipping 1 59 kg 3 Ib e PO DO 11855A 75 Q Type N Accessory Kit Function Provides the RF connecting hardware gen erally requir
56. Line Voltage and Fuse Selection WARNING BEFORE THIS INSTRUMENT IS SWITCHED ON its protective earth terminals must be connected to the protective conductor of the mains power cable cord The mains power cable plug shall only be inserted in a socket outlet provided with a protec tiveearth contact DO NOT negate the earth grounding protection by using an extension cable power cable or autotransformer without a protective ground conductor Failure to ground the instrument properly can result in serious personal injury or death CAUTION BEFORE SWITCHING ON THIS IN STRUMENT make sure it is adapted to the voltage of the ac power source You must set the voltage selector cards correctly in both the top and bottom units of the 85054 to adapt it to the power source Failure to set the ac power inputs ofthe instrument for the correct voltage level could cause it to be severly damaged when switched on A2 15 Select the line voltage and fuses in both the top and bottom units of the 8505A as follows a Measure the ac line voltage you will be apply ing to the 8505A b Figure A2 3 At each of the instrument s two rear panel power line modules select the 2 4 Model 85054 line voltage 100V 1207 220V or 240V Closest to the voltage you measured in step a Note that the available line voltage must be within 5 or 10 of the line voltage selection as shown below If it is not you must use an autotransform
57. MKR ZRO stores the offset required to move the measurement marker and trace to the reference line The REF ZRO se quence is used to establish a non zero reference as for the or 180 degree phase offset required for reflec tion phase calibration The REL indicator above the display lights to show that a calibration offset is stored and that the measured value is relative to the calibration standard Pressing and holding CLR for about one second clears the stored calibration and extinguishes the REL indicator 12 INTRODUCTION MKR ZRO To calibrate using MKR ZRO select the measurement mode select then press and hold ZRO until the iterative process which moves the marker to the reference line and zeros the measured value display is com plete 2 or 3 sweeps Now the measurement marker is positioned on the reference line and the MKR and REF values are both zero The process assigns the reference line the value of zero then stores the offset required to move the measurement marker to the reference line This is an example of MKR ZRO operation for magnitude calibration using a simple transmission test set with a through connection B R dB magnitude ratio B dBm dBm 6dBm 18 dBm 12dB B R MAG measured value B R dB Stored calibration reference offset Before calibration 12 4 0 00 1248 After MKR ZRO calibration 12 4 12 0 00 dB Calib
58. NRFD DAV EOI DIO4 DIO3 DIO2 DIO1 NW t DA Figure 2 7 HP IB Connectors A2J10 and 11 Signals and Pin Configuration A2 10 Model 8505A Cable connects to TEST SET INTER CONN recep tacle A3J3 Signal lines in the Test Set Intercon nect Cable are identified in Figure A2 9 A2 32 Recorder Output Connections A2 33 BNC connector receptacles A3J4 through 7 furnish channel 1 channel 2 X axis sweep and pen lift outputs which can be applied to an X Y recorder See Table 1 2 Auxiliary outputs for output signal characteristics See Table A2 3 for outputs with various combination of front panel control settings A2 34 Display Input Connections A2 35 BNC connector receptacles A3J8 through A3J10 can be used to apply signals from external sources to the Signal Processor CRT display A2 36 AM Input Connection A2 37 BNC connector receptacle A2J5 AM IN PUT enables an external signal to be applied to the Source Converter ALC control circuit to amp litude modulate the RF signal A2 38 External Trigger Input Connection A2 39 BNC connector A2J6 EXT TRIGGER enables the Frequency Control sweep to be trig gered from an external source when the Frequency Control assembly s front panel TRIGGER switch is set to EXT A2 40 PREPARATION FOR RESHIPMENT A2 A1 Original Packaging 2 42 If you must reship the 8505A and you have not retained the original packing mat
59. O pushbutton to position the trace near the center graticule line The maximum trace deviation from the highest point to the lowest point should be lt 6 degrees 3 divisions If the reading is out of tolerance the power splitter tracking may be at fault Check the power splitter tracking as follows Reverse the connections to the power splitter legs then make the phase measurements again and subtract the two readings The difference in readings is the power splitter tracking error Correct the original phase measurements by subtracting one half the power splitter tracking error s Set WIDTH to START STOP 2 for the 750 to 1300 MHz range The trace deviation should be 10 degrees 5 divisions t Repeat steps o through s for A R measurement Set all switches the same except set Channel 1 INPUT switch to A R in step and set ELECTRICAL LENGTH INPUT switch to A in step q GROUP DELAY FREQUENCY RESPONSE u On A3 Signal Processor set Channel 1 INPUT switch to A R MODE switch to DLY and set SCALE DIV switch to 1 ns Set Frequency Control MODE switch to LIN FULL V Press Electrical Length DISPLAY CLR pushbutton Press Channel 1 DISPLAY MKR then ZRO pushbuttons to center CRT trace about center graticule line and zero digital readout w On A2 Frequency Control adjust MARKER 1 frequency control between 0 5 and 1300 MHz and note the highest and lowest reading on the Signal Processor Channel 1 readout The difference between the highest an
60. ON CHECK FUSE TO MAKE SURE IT IS OF COR RECT RATING AND TYPE FOR INPUT AC LINE VOLTAGE FUSE RATINGS FOR DIF FERENT LINE VOLTAGES ARE INDICATED BELOW POWER MODULE INSERT CORRECT FUSE IN FUSEHOLDER Figure A2 3 Line Voltage Selection with Power Module PC Board 2 5 Installation Table A2 2 Talk and Listen Addresses Model 8505A T Talk Listen Decimal b b b b b Address Address Vu dis Character Character 0 0 0 0 0 SP 00 0 0 0 0 A 01 0 0 0 0 B 02 0 0 0 03 0 0 1 0 0 04 0 0 1 0 05 0 0 1 0 amp 06 0 0 1 07 0 1 0 0 0 H 08 0 1 0 0 I 09 0 1 0 0 J 0 0 1 0 1 K 11 0 1 1 0 0 L j 12 0 1 1 0 1 3 0 1 1 0 N 4 0 1 1 1 5 j 0 0 0 0 g 16 0 0 0 1 Q 1 7 0 0 0 R 2 8 0 0 I epe 8 3 19 0 1 0 0 T 4 20 0 1 0 1 U 5 21 0 1 0 V 6 22 0 1 1 7 23 1 0 0 0 X 8 24 1 0 0 1 Y 9 25 1 1 0 1 0 7 26 1 1 0 1 A 27 1 1 0 0 28 1 1 0 1 29 1 1 0 gt 30 Preset Address of Signal Processor Preset Address of Frequency Control P A2 6 Model 8505A Installation 2 1651 2151 Azo 1583 MSB SWITCH POSITIONS LOGIC 1 LOGIC O ON OPEN GROUND NOTES l Darkened side of switch is pushed in 2 Switch is shown in ASCII code 3 for Listen Address or S for Talk Address 3 LSB Least Significant Bit MSB Most Significant
61. Offset Range 1700 degrees Accuracy 0 3 0 5 of offset Resolution Marker Measurement 0 1 over lt 100 range and 1 for 2100 range CRT Display 1 to 180 per division in 8 steps POLAR CHARACTERISTICS Frequency Response Dynamic Response Reference Offset and Marker Measurement specifications are the same as magnitude and phase characteristics CRT Display Accuracy Actual value is within less than a 3 mm circle of the displayed value Tracking Between dB Offset Controls and Polar Full Switch positions 0 2 dB CRT Display Resolution Magnitude graticules at 20 of full scale spacing phase graticules at 10 increments around unit circle DELAY CHARACTERISTICS Frequency Response 1 ns from 500 kHz to 1 3 GHz Delay Accuracy 3 of reading 3 units Units 1 nsec for 0 5 to 1300 MHz range 10 nsec for 0 5 to 130 MHz range and 100 nsec for 0 5 to 13 MHz range Range Resolution and Aperture Frequency Range MHz 0 5 to 13 0 5 to 130 0 5 to 1300 Range 0 to 80 us O 108 us 0 to 800 ns Resolution CRT 100 ns 10 ns ns Marker 100 ns 10 ns Ins Marker over limited Range 10 ns las 0 1 ns 1 us lt 100 ns lt 10 ns Aperture 7 kHz 20kHz 200kHz Reference Offset Range 1999 units Accuracy 0 3 units 0 3 of offset Al 6 Model 5505 General Information Table 1 1 8505A Network Analyzer Performance Specifications 3 of 3 ELECT
62. RICAL LENGTH REF PLANE EXTEN SION CHARACTERISTICS Calibrated Electrical Length Range and Resolution Frequency Range MHz 0 5 to 13 0 5 to 130 0 5 to 1300 xT 199 m 1 99 19 9 Range x10 100 10 tjm x1 10 1 0 1 Resolution x10 1m 10 1 3 Units may be calibrated out Typical measurement Aperture using linear FM modulation technique Vernier provides continuous adjustment of electrical length Accuracy 3 of reading 1 of range Resolution 10 Vernier Range Continuously variable over 710 range Accuracy 3 of reading 10 scan Phase Compensation Linearity lt 0 2 of phase slope inserted Dimensions 426 mm wide 279 mm high 553 mm deep 16 3 4 in x 11 in x 21 3 4 in Weight Net 36 kg 86 Ib Shipping 48 kg 106 Ib Table Al 2 Supplemental Characteristics 1 of 2 SOURCE Swept Frequency Resolution Verniers provide con tinuous frequency adjustment 10 kHz 100 kHz 1 MHz cw 10 kHz 100 kHz 1 MHz 1 kHz 10 kHz 100 kHz Cw 100 Hz 1 kHz 10 kHz Frequency Counter Resolution Least Significant digit Typical CW Noise SSB in 1 Hz BW 0 5 to 13 0 5 to 130 0 5 to 1300 Frequency Range MHz dB below carrier Frequency offset from carrier Frequency Range MHz 0 5 to 13 0 5 to 130 0 5 to 1300 10 ms Sweep Time 10 kHz 100
63. ROBE PWR jacks transfer functions in impedance systems radically Warning The output of the 1121A is direct coupled different from 50 Furnished with 10 1 and and has an output voltage of approximately 2 to 4 100 1 divider and BNC adapter V The output must not be dc coupled or the probe may be permanently damaged If using the 1121A with Bandwidth 3 dB 1 kHz to 2500 MHz instruments other than the 8505 or if an attenuator pad is to be used at the probe output be sure a block Gain 0 dB 1 dB ing capacitor is provided Model 10240B or equivalent can be used Frequency Response 1 kHz to 100 MHz 0 5 dB 27 Weight Net 0 7 kg 1 5 lb Shipping 1 2 kg 2 5 Ib GER 1 12 Modei 8505A General Information Table A1 3 Test Sets and Accessories 5 of 7 11852A 50 Q to 75 Minimum Loss Pad Function A low SWR impedance conversion is re quired for accurate transmission measurements of 75 devices using the 8505A Receiver 50 Q The Minimum Loss Pad provides a matched impe dance in both directions 50 2 to the 8505A and 75 to the device under test Frequency Range DC to 1 3 GHz Insertion Loss 5 7 dB Return Loss 230 dB 1 06 SWR Maximum Input Power 250 mW 424 dBm Connectors 50 OQ Type N Female to 75 Type N Female Dimensions Diameter 14 mm length 70 mm 9 16 in x 2 3 4 in Weight Net 0 11 kg 4 oz Shipping 0 26 kg 9 11853A 50 Type Accessory
64. ROCEDURE POWER OUTPUT RANGE a Set 8505A controls as follows On 1 Source Converter OUTPUT LEVEL dBm sees 10 OUTPUT LEVEL Vernier 0 cece 0 On A2 Frequency Control RANGE MHZ rore rtp eda eii lin 5 1300 MO DE s PR RAPI e tee kin Iba LIN EXPAND recu Ree eA PRESE PI ea Rue Cw SCAN TIME SEG fics sea a u er 1 1 CW FREQUENCY MHz ssee 8 30 0 MHz A2 21 Installation Model 8505A A2 52 POWER OUTPUT LEVELING TEST AND ABSOLUTE POWER CALIBRATION Cont d b Connect equipment as shown in Figure A2 14 and set Power Meter range to 15 dBm c Measure power output at the OUTPUT LEVEL dBm settings of 10 dBm to 20 dBm readings should be within 1 5 dB tolerance of power meter The HP 435A 8482A power meter has an uncertainty of 0 4 dB OUTPUT LEVEL VERNIER d Set power meter to 15 dBm range Set OUTPUT LEVEL dBm switch to 10 dBm Turnthe OUTPUT LEVEL dBm VERNIER from 0 to 12 dB position and the power meter indication should change by 12 dB 1 dB tolerance of power meter used If slightly out of tolerance go to Paragraph 5 14 for adjustment POWER LEVELING f While watching the power meter turn the CW FREQUENCY control through the entire band The total variation between the highest power and the lowest power indication across the band should be lt 1 dB or 0 5 dB A2 53 CROSSTALK ISOLATION AND RECEIVER NOISE FLOOR SPEC
65. RODUCTION READ MEASURED VALUE general sequence to read the measured value at a par ticular point on the CRT trace is as follows T 3 r 01 Measured Value Display NENNT m Use REF OFFSET buttons and SCALE DIV switch to position CRT trace on the screen Select one of the five measurement markers using the MARKERS switch then position the marker on the CRT trace at the point to be measured using the adjacent numbered vernier Read the frequency at the measurement marker from the FREQ COUNTER MHz display Press REF button and read the value of the reference line Press MKR button and read the marker displacement from the reference line Add the REF and MKR values to obtain the measured value at the measurement marker 5 HO RS REF and MKR Value Display Modes When the REF button is pressed the measured value display shows the value assigned to the reference line When the MKR button is pressed the measured value display shows the displacement of the selected measurement marker from the reference line The magnitude phase or delay value at any point on the CRT trace is then REF value MKR value Measured Value If REF OFFSET has not been used to position trace REF will equal zero and the MKR value alone represents the measured value REF OFFSET Pressing any REF OFFSET button increments
66. TION TEST 2 48 These procedures test the salient specifica tions of the instrument and should be used for in coming inspection They functionally test all major operating modes and test the major specifications of the instrument If certification is required use the more lengthy procedure in Section IV which tests all of the detailed specifications of the instru ment A2 49 EQUIPMENT REQUIRED A2 50 The equipment required to perform the incoming inspection is listed in Table A2 4 and shown in Figure A2 11 If substitution is necessary for any of the equipment the alternate models must meet or exceed the critical specifications Text continued on page A2 19 A2 11 Installation Model 8505A NORMALIZER INTERCONNECT RECEPTACLE A3J1 AS VIEWED FROM REAR OF INSTRUMENT CHANNEL 1 FILTER CHANNEL 2 RECT POSN 1 RECT POSN 2 POL POS X FILTER X NORM Y NORM Z M0D NORM Z TTL NORM Mnemonic POL POS Y LOFF CH 1 LOFFCH2 L NORM DBP X POS VSW2 L POLAR MP MARK PULSE DM DATA MARKER SW ALT SPARE PL PEN LIFT Description RECT POSN 1 RECT POSN 2 POL POS X POL POS Y LOFF CH1 L OFF CH 2 L NORM BP3 DBP RECT X POS VSW2 L POLAR MARK PULSE DATA MARKER SW ALT SPARE PL Rectangular position Channel 1 Rectangular position Channel 2 Display Polar Offset X axis Display Polar Offset Y
67. WER SPLITTER 95 dB 9 5 dB 11850A RF Schematic Frequency Range 500 kHz to 1 3 GHz 9 5 dB Frequency Response Absolute Input to Output lt 0 2 dE Nominal Insertion Loss 9 54 dB for 11850A 7 78 dB for 11850B Impedance 11850A 50 Q 118508 75 Q Tracking Between Any Two Output Ports lt 0 1 dB Magnitude and lt 1 5 Phase 11600B 11602B TRANSISTOR FIXTURES 1 Port Match Output Ports gt 32 dB Return Loss lt 1 05 SWR Input Port 220 dB Return Loss 1 2 SWR Maximum Operating Level lt 20 dBm input Burn out Level gt watt CW RF Connectors 11850A 50 Q Type N Female 11850B Test Ports 3 75 Type N Female RF input 50 2 Type N Female Recommended Accessory 11851A Cable Includes 11850B includes three 50 Q to 75 minimum loss pads 118524 Dimensions 67 mm wide 46 mm high 67 mm deep 2 5 8 in x 1 7 8 x 2 5 8 in Weight Net 1 8 kg 4 Ib Shipping 3 1 kg 7 Ib Tentative specification for 11850B Lead Lengths Up to 1 5 inches long Frequency Ranges DC to 2 GHz Impedance 50 Q nominal Return Loss gt 26 dB 100 MHz to 1 0 GHz gt 21 dB from 1 to 2 GHz Function These units allow RF measurements to be made on leaded transistors Either fixture pro vides common emitter base and collector for bi polars and common source gate and drain for FET s Other devices also fit the fixtures tunnel diodes diodes etc T
68. Wer ER E d ae s 1 Marker dimna Petre i a T ETE Midrange TRIGGER aririh pots bagi CPI EPA e EE ac AUTO On A3 Signal Processor Channel 1 ce Ee valde AN Ete CE du a A R MODE DR Reels FE Raped TERRESTRE e CE DLY SCALE DIV esset ee Rr RE d DELAY 100 ns Channel 2 MODE Sid Uer PUR mg OR ene AS OFF Electrical Length INPUT fc cea eR ete Rete A 54 edes GR de OFF d Press Electrical Length DISPLAY CLR pushbutton Press Channel 1 DISPLAY REF pushbutton then CLR pushbutton until REL light goes out if it was lit Then press MKR pushbutton f Connect Test Cable between adapters in the A channel The Channel 1 digital read out should indicate the group delay calculated for the Test Cable in step a 5 above 1 ns 3 of reading A2 39 A2 40 Model 8505A Operating and Programming Instructions SECTION Ill OPERATING AND PROGRAMMING INSTRUCTIONS A3 1 INTRODUCTION A3 2 This section of the manual contains instruc tions showing how to make transmission and re flection measurements in both manual and auto matic modes A3 3 Included are step by step instructions on manual operation supplied in Application Note 219 as well as detailed instructions for programming the 8505A in automatic mode from an external controller through the Hewlett Packard Interface Bus HP IB A3 4 Manual Operation A3 5 Application Note 219 is included in this section to introduce you to the
69. age styles Option 002 TO 51 0 250 in dia Option 003 HPAC 200 0 205 in dia Function Provides the capability of completely characterizing stripline transistors in either the Calibration References Options 002 and 003 are sup TO 51 or HPAC 200 package styles For special plied with two calibration references a short circuit package styles a through line microstrip and termination and a 50 Q through section bolt in grounding structure machinable by customer is available Connectors APC 7 Hybrid connectors Mates with 8503A and 8746B S parameter Test Units Option 100 Type Frequency Range DC to 12 4 GHz N Female connectors Impedance 50 Q nominal Maximum Power 10 W including RF signals Return Loss gt 26 dB dc to 4 GHz gt 23 dB 4 0 to Weight Net 0 9 kg 2 Ib 8 0 GHz 219 dB to 12 4 GHz Shipping 1 4 kg 3 15 Microstrip Material 0 031 in polyphenylene oxide Dimensions 143 mm wide 25 mm high 89 mm deep 0 0 080 in wide 50 Q stripline 5 5 8 in x 1 in x 3 in Input Impedance 100 shunt capacitance 3 pF at 100 1121A MHz With 10 1 or 100 1 divider 1 shunt capaci ACPROBE tance 1 pF at 100 MHz Output Impedance 50 Q nominal Maximum input 300 mV rms 100 V dc With 10 1 divider 3 V rms 350 V dc With 100 1 divider 30 V rms 350 V dc Function For making signal measurements without disturbing circuitry and for measuring voltage Power Supplied by 8505A through P
70. ailable for updating manuals al ready shipped from the factory To obtain the latest Manual Changes supplement contact your nearest Hewlett Packard office Ai 14 SAFETY CONSIDERATIONS 1 15 General 1 16 This is a Safety Class I instrument This instrument has been designed and tested accord ing to International Safety Requirements for Elec tronic Measuring Apparatus 1 17 Safety Symbols Instruction manual symbol the ap A paratus will be marked with this sym bol when it is necessary for the user to refer to the instruction manual in order to protect the apparatus against damage Indicates dangerous voltages Earth terminal sometimes used in manual to indicate circuit connected to grounded chassis The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly per formed or adhered to could result in injury or loss of life Do not proceed beyond a WARNING sign until the indi cated conditions are fully un derstood and met The CAUTION sign denotes a hazard It calis attention to an operating procedure practice or the like which if not cor rectly performed or adhered to could result in damage to or destruction of part or all of the equipment Do not pro ceed beyond a CAUTION sign until the indicated conditions are fully understood and met ik ow Model 8505A 1 18 Operation CAUTION BEFORE APPLYING POWER make su
71. arkers on the CRT trace to identify the sweep end points The FREQUENCY controls position these markers each adjacent VERNIER provides fine adjustment but does not change the FREQUENCY MHz displays For ALT CHANNEL 1 displays the START STOP 1 sweep and CHANNEL 2 displays the START STOP 2 sweep The FREQUENCY MHz displays and the FREQ COUNTER MHz display readings apply to the START STOP 1 sweep unless CHANNEL 1 is off in which case the readings apply to the CHANNEL 2 sweep For CW the frequency counter measures the actual CW frequency and displays it using the left hand six digit FRE QUENCY MHz display In START STOP and CW AF the FREQUENCY MHz displays do not have counter accuracy and thus should not be used for other than setting approximate frequency sweep widths Residual FM performance is improved in the lower RANGE MHz settings so select the lowest setting which includes the frequency range of interest for your measurement The frequency controls can be set so that the start frequency is above the stop frequency but degraded sweep linearity will reduce the accuracy of the measured frequency and group delay values Set Sweep Time Time for a complete sweep of the selected frequency range is selected by the SCAN TIME SEC switch and ad jacent VERNIER Select the fastest sweep time then decrease until there is no distortion of the test device response The vernier allows continuous adjustment within the selected range 9 INT
72. axis Channel 1 on off to Normalizer Low 7 off Channel 2 on off to Normalizer Low off Normalizer inputs enable Low 7 inputs enable Blanking Pulse 3 Display Blanking Pulse High blank Rectangular X Position Sweep voltage to 13 to Signal Processor Low polar alternate Low polar display Marker pulse to Normalizer High 7 display marker Data marker High display marker and measure Sweep alternate Signal Processor to Normalizer High Channel 1 Low Channel 2 Pen lift Figure A2 8 Normalizer 8505A Interconnecting Signal Lines and Receptacle Terminals A2 12 Model 8505A Installation TEST SET INTER CONN A3J3 AS VIEWED FROM REAR OF INSTRUMENT VSW2 LEV SW BLNK LEV SW EN LEV SW LOG R TEST SET 1 0 LEXT 1 O8 LIN AB R 956 Os SIGNAL PROCESSOR ASSEMBLY GROUND E MNEMONICS TABLE Pin Mnemonic Description 1 VSW2 Sweep voltage independent of frequency or mode 2 LEV SW BLNK Level sweep blanking 3 LEV SW EN Level sweep enable 4 LEV SW Level sweep LOG Log magnitude of input R 6 TEST SET Test Set 8503A control line 7 L SNGL Low Single sweep Return to LOCAL 8 LEXT External signal control line 9 LIN AB R Linear ratio output of A or B over Figure A2 9 8503A S Parameter Test Set 8505A Interconnecting Signal Lines and Receptacle Terminals 2 13 Installation M
73. ble Al 4 Other equipment may be substituted for the equipment listed providing it meets or exceeds the critical specifications indi cated in the table Model 8505A General Information Table A1 3 Test Sets and Accessories 1 of 7 8502A 50 TRANSMISSION REFLECTION TEST SET 8502B 75 Q TRANSMISSION REFLECTION TEST SET gt Reference 19 dB I 6 dB 12 dB Pad Test 13 dB e 0 dB Atten Setting 6 dB Coupling Reflection DC Bias 8502A RF Schematic Frequency Range 500 KHz to 1 3 GHz Impedance 85024 50 2 8502B 75 Q Directivity gt 40 dB Frequency Response Transmission lt 0 8 dB Magnitude and 8 Phase Reflection 1 5 dB Magnitude and lt 15 Phase from 0 5 to 1300 MHz lt 10 Phase from 2 to 1300 MHz Port Match TestPort 226 dB Return Loss from 2 to 1300 MHz lt 1 12 SWR 220 dB Return Loss from 0 5 to 2 MHz 1 22 SWR Test Port Open Short Ratio 0 75 dB Magnitude and 6 Phase from 2 to 1000 MHz 0 9 dB Magnitude and 7 Phase from 1000 to 1300 MHz 41 25 dB Magnitude and 10 Phase from 0 5 to 2 MHz Reference and Reflection Port 225 dB Return Loss from 2 to 1000 MHz lt 1 12 SWR 223 dB Return Loss 0 5 to 1300 MHz lt 1 15 SWR Input Port gt 23 dB Return Loss lt 1 15 SWR Insertion Loss Input to Test Port 13 dB input to Reference Port 19 dB Input to Reflection Port 19 dB Maximum Operating Level lt
74. cuit Storage Case Dimensions 254 mm wide 64 mm high 191 mm deep 10 in x 2 in x 7 in Weight Net 1 13 kg 27 Ib Shipping 1 59 kg 3 Ib c t 85036 759 Type N Calibration Kit Function This calibration kit contains 759 Type N con nector adapters short circuits and terminations This hardware is required for making error corrected meas urements in accuracy enhancement program AIM test setups that use equipment with 752 Type N connectors Kit Includes Oty Description 1 750 Type N Male to Type N Male adapter 759 Type N Female to Type N Female adapter 750 Type Male short circuit 759 Type N Female short circuit Type N 75Q termination Type N Female 7500 termination 1 Storage Case Dimensions 168 mm wide 114 mm deep 51 mm high 6 5 8 x 1 2 in x 2 in Weight Net 0 91 kg 2 lb Shipping 1 36 kg 3 lb moa eA en 1 14 Model 8505 8505A TEST SET AND ACCESSORY RECOMMENDATIONS Can be ordered as 1 1600B 11602B Option 003 Three 50 to 75 0 M Table 1 3 Test Sets and Accessories 7 of 7 General Information TRANSISTOR TRANSMISSION S PARAMETERS PARAMETERS REFLECTION TO 8 TO72 so Qj MEASUREMENTS Type 50 9 Type N 500 BNC 50 2 200 BNCOOQ Type N 75 Q TRANSMISSION MEASUREMENTS Only Type 50 2 BNC 50 Q TypeN 75 Q 8505 Network Analyze
75. d CRT display Each unit has its own ac power input receptacle and dc power supplies A1 10 INSTRUMENTS COVERED BY THE MANUAL Al ll Attached to the upper and lower units of the instrument are two identical serial number plates both inscribed with the same serial number As shown in Figure 1 2 the serial number is in two parts The first four digits and the letter are the serial number prefix the last five digits are the suffix The prefix is the same for all identical in struments it changes only when a change is made to the instrument The suffix however is assigned sequentially and is different for each instrument contents of this manual apply to instruments with the serial number prefix es listed under SERIAL NUMBERS on the title page SERIAL NUMBER PREFIX SUFFIX M pene SER 1806400572 001 005 007 HEWLETT MADE IN USA Figure A1 2 Serial Number Plate A 12 Occasionally the manual will be accomp anied by a yellow Manual Changes supplement The Manual Changes supplement contains changes that have not yet been incorporated in the manual box in the upper right corner of the Manual Changes supplement identifies the affected manual by part number and print date The supplement also identifies the serial numbers or serial number prefixes of instruments affected by it 1 2 Model 8505A A 13 The Manual Changes supplement when there is one is av
76. d sweep width as follows Posi tion the measurement marker as far to the left as possible before the FREQ COUNTER MHz display blanks Read the phase value 100 in this example and determine the total number of degrees before the first transi tion trace 100 180 Next count the second and following transition traces and multiply by 360 2 x 360 Now determine the number of degrees from the last transition trace to the right edge of the screen 180 60 The sum of these values represents the total phase shift over the frequency sweep 100 180 3 x 360 180 60 1600 When the transmitted signal is below the noise floor for insertion phase measurements the CRT trace usually reads zero degrees 18 TRANSMISSION MEASUREMENTS ELECTRICAL LENGTH This sequence lists the steps for a typical measurement of equivalent electrical length 7 UU SETUP Set signal levels Set frequency sweep Set CRT display CALIBRATION Connect through CHANNEL 1 B R PHASE 90 degrees division ELECTRICAL LENGTH B MODE as required usually PHASE x10 SCAN CLR if REL lighted Center marker press MKR then press and hold LENGTH and VERNIER B for flat response CHANNEL 1 280 while adjusting LENGTH ZRO MEASUREMENT Connect test device Electrical length MODE and sweep width if PHASE x10 SCAN selected must be same as calibration ELECTRICAL LENGTH LENGTH for flat response over frequency range o
77. d the lowest reading peak to peak variation due to frequency response should be lt 2 ns x Repeat steps t through v for B R measurement Set all switches the same except set Channel 1 INPUT switch to B R in step u A2 57 PHASE ACCURACY AND ELECTRICAL LENGTH TEST SPECIFICATION Phase Accuracy 0 01 degrees degree for 170 degrees 0 01 degrees degree 0 5 degrees for 180 degrees 2 32 Model 8505A Installation 2 57 PHASE ACCURACY AND ELECTRICAL LENGTH TEST Cont d Polar Accuracy Actual value is within less than a 3 mm circle of displayed value Electrical Length Accuracy 3 of reading 1 of length range DESCRIPTION The hysteresis loop is observed to see that the 180 degree transition occurs at precisely 180 degrees and 180 degrees The electrical length offset is checked by inserting two phase cyles and reading the resultant Electrical Length digital readout of 720 degrees 8505A NETWORK ANALYZER RF c OUTPUT e o polo 22 RIA MATCHED COAXIAL n ADAPTER CABLES IL POWER SPLITTER 5082 TERMINATION LU Figure A2 20 Phase Accuracy Test Setup EQUIPMENT Power Splitter sso coe ey ee HP 11850A RE Cable K1t omues ones Be Posie ah oe HP 11851A Type N Female to Type N Female Adapter HP 1250 0777 50 ohm Termination 2 HP 909A Option 012 PROCEDURE PHASE ACCURACY TEST a 85054A set the controls as follows On Al Source Conv
78. e phase and delay measurements 3 dB Frequencies For example the insertion loss or gain measurement sequence can be extended to measure the 3 dB points of the filter SCALE DIV 1 dB division Set frequency sweep to center the passband trace with 3 db points visible Position measurement marker to center of passband or minimum insertion loss point MKR then use REF OFFSET so value is zero Move marker so MKR value is 3 00 dB Read frequency from FREQ COUNTER MHz Move marker to other 3 dB point and read frequency CLR momentarily to remove REF OFFSET Be sure to press CLR momentarily if held for more than about one second the REL light will go out indicating that the stored calibration offset has been cleared and recalibration is necessary Gain Compression A sequence similar to that above can be used to measure the 1 dB gain compression output power tna E Position measurement marker to frequency of interest OUTPUT LEVEL dBm and VERNIER to increase incident power level until magnitude ratio begins to decrease i MKR then use REF OFFSET so MKR value is zero Increase incident power until MKR value is 1 dB Dr uc PERF NES The amplifier output level can be estimated by summing the amplifier gain and sweeper output power then subtracting test set transmission loss A more precise measurement can be made by connecting the test device output directly to th
79. e B input and measuring the absolute power level by selecting B MAG see page 25 17 TRANSMISSION MEASUREMENTS INSERTION PHASE This sequence lists the steps for a typical insertion phase measurement p zm e de P 9 SETUP Set signal levels Set frequency sweep Set CRT display MARKERS 1 position measurement marker so FREQ COUNTER MHz reads desired calibration frequency CALIBRATION Connect through CHANNEL 1 B R PHASE 90 degrees division ELECTRICAL LENGTH B MODE as required usually x1 or x10 CLR if REL lighted LENGTH AND VERNIER B for flat response p CHANNEL 1 Center marker press MKR then press and hold MKR ZRO hold until display zero CHANNEL 1 ZRO while adjusting LENGTH MEASUREMENT Connect test device Electrical length MODE and sweep width if PHASE x10 SCAN selected same as calibration Position measurement marker to read insertion phase MKR REF and frequency This figure shows a bandpass filter insertion phase The 8505A phase measurement range is 180 to 180 degrees and E the vertical line represents the transition between these values ES Thus the trace between any two of these transition lines represents 360 degrees of phase shift 60 180 To illustrate the display format determine the total phase shift for the selecte
80. e Converter and Frequency Control Assemblies is affected by operation of the LINE switch the Processor Assembly will have power applied to it as long as the line cord power cable is connected to an ac source regardless of the pos ition of the LINE switch DO NOT as sume there are no dangerous vol tages present in the Signal Processor Assembly until you have checked the position of the NORM BY PASS switch 1 3 zeneral Information 1 25 SPECIFICATIONS 1 26 In order to provide the maximum amount of information about the usefulness and flexibility of the 85054A both the performance specifications and the supplemental characteristics are listed in Tables 1 1 and 1 2 Specifications describe the instrument s warranted performance over the temperature range of 20 to 30 Supplemental Characteristics are intended to provide information useful in applying the instrument by giving typical but non warranted performance parameters A1 27 OPTIONAL 8505A EQUIPMENT A1 28 Option 005 Phase Lock 1 29 Option 005 provides the capability for phase locking the HP 8505A to an external stable signal source such as the HP 8660A C Synthesized Signal Generator or HP 8640A B Signal Generator When phase locked the residual FM of the system approaches that of the external signal source This system is useful in making very narrow band meas urements See Chapter E for further information A 30 Option 007 Labeling Interface A
81. e power source BEFORE SWITCHING ON THE IN STRUMENT the protective earth ter General Information minals of the instrument must be connected to the protective conduc tor of the mains power cord The mains plug shall only be inserted in a socket outlet provided with protec tive earth contact The protection ac tion must not benegated by using an extension cord power cable without a protective grounding conductor Grounding one conductor of a two conductor outlet is not sufficient pro tection Any interruption of the protective grounding conductor inside or out side the instrument or disconnection of the protective earth terminal is likely to make this instrument dangerous intentional interruption of the earth ground is prohibited Whenever it is likely that the protec tion has been impaired the instru ment must be secured against any unintended operation Servicing this instrument often re quires that you work with the instrument s protective covers re moved and with ac power connected Be very careful the energy at many points in the instrument may if con tacted cause personal injury WARNING At the top left rear of the Signal Pro cessor Assembly A3 under the top cover there is a two position NORM BY PASS switch When this switch is setto NORM the front panel LINE ON OFF switch controls the primary power into the entire 8505A When it is set to BY PASS however only the lower unit Sourc
82. ear the calibration offset value Pressing and holding CLR until the REL indicator goes out will make re calibration necessary 13 INTRODUCTION SET ELECTRICAL LENGTH Electrical length is equal in the reference and test signal paths when the linear insertion phase response does not vary is constant over the frequency sweep of interest Constant insertion phase is identified by a flat trace in a cartesian measurement or a small cluster in a polar measurement Reference Phase Polar Phase Reference Phase Polar Phase CNN RON LES xm Swept 90 Source 90 Equal Electrical Length Phase relationship constant with frequency Unequal Electrical Length Phase relationship shows linear variation with frequency On the ELECTRICAL LENGTH part of the control panel IN PUT selects display of the electrical length added to or sub tracted from the reference signal path to equalize the A or B test signal path There are two Electrical Length Offset registers one for A and one for B The LENGTH pushbuttons increment the register selected by INPUT allowing independent equalization of the two test signal paths Momentarily pressing the CLR but ton sets the selected register and display to zero The A and B VERNIERS allow fine length adjustment without changing the LENGTH display or the value stored in the A or B electrical length register Setting MODE to OFF removes the line length oma equalization for the test s
83. easures magnitude phase and delay characteristics of linear networks by comparing the incident signal with the signal transmitted through the device or reflected from its input The basic transmission measurements described in this note are insertion loss and gain insertion phase elec trical length deviation from linear phase group delay and transmission coefficient S or Sz Basic reflection measurements are return loss from which SWR can be calculated and reflection coefficient 1 or S22 from which impedance can be calculated or read from a Smith Chart overlay To begin familiarizing yourself with the 8505A recognize that it is packaged in two cases The lower case contains the sweeper controls and displays the receiver input connections the measurement marker controls and the frequency counter display The upper case contains the dual trace CRT the measurement selection con trols the measured value displays and the electrical length controls and display The boxed characters adja cent to the switches buttons and displays are HP IB addressing codes used when programming the instrument Block Diagram Description The source produces leveled RF for the test device and a tracking local oscillator signal to the receivers Reference and test and B inputs from the test setup are down converted to 100 kHz IF frequency for ap plication to the detectors This combination of two identical fixed oscillators which are p
84. ed cable by the HP Part Number shown from the nearest Hewlett Packard office A2 23 Frequency Controi Signal Processor Inter connect Cable A 24 Connect the Frequency Control Signal Processor cable HP Part No 08505 60021 be tween FREQUENCY CONTROL INTER CONN receptacle A3J2 and SIGNAL PROCESSOR INTER CONN receptacle A2J4 as shown in Fig ure A2 5 Model 8505A Plug Type Cable HP Part Number Plug Description Length inches Cable Color Installation For Use In Country 8120 1351 Straight BS1363A 90 Mint Gray Great Britain D 4 8120 1703 90 90 Mint Gray Cyprus Nigeria Ne Rhodesia Singapore So Africa India 9 250V 8120 1369 Straight NZSS198 ASC112 79 Australia e 8120 0696 90 87 Gray New Zealand LON 250V E 8120 1689 Straight CEE7 Y11 79 Mint Gray East and West n j 8120 1692 90 79 Mint Gray Europe Saudi H Arabia United Arab Republic 95s unpolarized in L many nations 8120 1348 Straight NEMA5 15P 80 Black United States 8120 1398 90 80 Black Canada 8120 1754 Straight NEMAS 15P 36 Black Japan 100 or i 200V 8120 1378 Straight NEMA5 15P 80 Jade Gray Mexico 8120 1521 90 80 Jade Gray Phillippines 8120 1676 Straight NEMAS5 15P 36 Jade Gray Taiwan 250V 8120 2104 Straight SEV1011 79 Gray Switzerland 1959 24507 GF Type 12 a 6 E L 250V 8120 069
85. ed for 75 Type component measurements using the 8502B Reflection Transmission Test Set Kit Includes Oty Description 2 75 Q Type N Male barrel 2 75 Type N Female barrel 1 75 Type N Male short circuit H 75 Q Type N Female short circuit 1 Storage Case Dimensions 254 mm wide 64 mm high 191 mm deep 10 in x 21 in x 7 in Weight Net 0 91 kg 2 Ib Shipping 1 36 kg 3 Ib 11856A 759 BNC Accessory Kit Function Provides the BNC connecting hardware required for test setups using the HP 8502B Transmission Reflec tion Test Set the HP 8503B S Parameter Test Set the HP 11850B Power Splitter 75 ohm to make measurements on devices with 759 BNC connectors Kit Includes Oty Description 75Q Type N Male to BNC Female adapter 75Q Type N Male to BNC Male adapter 759 Type N Female to BNC Male adapter 759 Type N Female to BNC Female adapter 750 BNC Male short circuit BNC Male 75Q termination Storage Case Dimensions 168 mm wide 114 mm deep 51 mm high 6 5 8 in x 4 1 2 in x 2 in Weight Net 0 91 kg 2 ib Shipping 1 36 kg 3 1b t gt gt gt 11858A Rigid Interconnect Adapter Function Provides a rigid RF cable interconnection horizontal to vertical test port orientation between the 8503A S parameter Test Set and the 11600B 11602B Transistor Fixtures and 11604A Universal Extension 11604A information provided in 8410S data sheet Connectors APC 7 Dim
86. ensions 254 mm wide 64 mm high 191 mm deep 10 in x 2 in x 7 in Weight Net 0 91 kg 21b Shipping 1 36 kg 3 Ib 1 13 General Information Model 8505A Table A1 3 Test Sets and Accessories 6 of 7 85010A B 8507A B 8501A Application PAC Function Provides a cassette program that supplements the 85030A B Application PAC It provides faster data transfer and incorporates the normalization and averaging features of the 8501 Includes Cassette and Operating Programming Manual v 85030A 8507A 9830A Application PAC 85030B 8507B 9825A Application PAC Function Provides three cassette programs The Accur Enhancement Program AIM 30 or AIM 25 im proves measurement accuracy by removing mismatch directivity and frequency tracking errors for both one and two port devices The Verification Program operationally checks calculator network analyzer interfaces The Basic Measurements Program makes the features of Learn Mode and data printing plotting with 9862A Plotter and normalization available to non programmer Includes Manual Weight Net 0 91 kg 2 1b Shipping 1 36 kg 3 16 Cassettes and Operating Programmers 85031A Verification and APC 7 Calibration Kit Function This kit is furnished with the 8507A Auto matic Network Analyzer and is used for verification of measurement system performance 3 dB and 50 Pads are included for use with the 8507A s verif
87. er between the ac source and the 8505A Line Voltage Selection 90 to 105 Vac 100V 108 to 126 Vac 120V 198 to 231 Vac 220V 216 to 252 Vac 240V c Make sure the fuses in the power module fuse holder are ofthe correct type and rating Fuse requirements for the different line voltage selections are indicated next to the power modules A2 16 HP IB Address Selection A2 17 The talk listen address pair for the signal processor display is different than the talk listen address pair for the frequency control source con verter The pre set factory selected address pair for the signal processor display is Talk Address P Octal 120 and Listen Address Octal 060 the address pair for the frequency control source converter is Talk Address S Octal 123 and Listen Address 3 Octal 063 Before installing the HP IB interface assemblies other talk listen address pairs shown in Table A2 2 may be selected The code selected must of course be compatible with the sys tem The addresses are selected with switch S1 on the A3A21 and A2A16 HP IB Buffer Assemblies The numbers 1 through 5 on the two buffer assem blies correspond to b through bs respectively in Table A2 2 The address is selected by pressing the desired switch to the open position See Figure A2 4 The switches in Figure A2 4 are set to My Listen Address MLA in the ASCII character 3 address code Octal 063 or to My Talk Address MTA in the ASCH alpha character
88. erials the same kinds of containers and materials used for the original shipment can be obtained through the nearest Hewlett Packard Sales or Service office See Figure A2 10 A2 43 If the instrument is being returned to Hewlett Packard for servicing attach a tag indi cating the service required return address instru ment model number i e 8505A and the instru ment s full serial number Mark the container or containers FRAGILE to ensure careful handling A3 44 In any correspondence refer to the instru ment by mode number and its full serial number Installation A2 45 Other Packaging Materials 2 46 The following general instructions should be followed when repackaging with commercially available materials a Wrap the instrument in heavy paper or plas tic If you are shipping the instrument to a Hewlett Packard Service office or center at tach a tag indicating the kind of service re quired return address model number and full serial number b Place the wrapped instrument in a strong shipping container A double wall carton made of 350 pound test material is adequate c Place enough shock absorbing material a three inch to four inch layer around all sides of the instrument to provide a firm cushion and prevent any movement of the instrument inside the container d Seal the shipping container or containers carefully and mark it or them FRAGILE to ensure careful handling A2 47 INCOMING INSPEC
89. ers ns sau vA CP RP RU RA START STOP 1 START FREQUENCY 00 50 MHz STOP 02 00 MHz MARKBRS b EY ht poo EY INE e 1 Marker nisi te ate hig oes reti ers Center of CRT SCAN TIME SEC o ere ee er RIS 10 1 SCAN TIME Fully Clockwise TRIGGER PE eges Kt os AUTO On A3 Signal Processor Channel 1 INPUTS eau Rd EY ULM R MODE niinno nerag Bok EAR ERA RES s MAG SCALE DIV ee ehate ds 10 dB DIV Channel 2 MODE CLER eas ain d ble OFF CRT Display BANDWIDTH 2 10 kHz VIDEO BIETER font cuca alice EVE ame Did ON in NOISE FLOOR FROM 0 5 to 2 MHz Connect 50 Ohm terminations to R and B ports On Signal Processor Dis play press REF LINE POSN then adjust CH1 control to place the CRT reference trace on the center graticule line Press REF LINE POSN again for normal operation d At Channel 1 press DISPLAY REF then CLR pushbutton until REL light goes out Gf it was lit Set INPUT switch to A repeat above procedure then set INPUT switch to B and repeat above procedure Return Channel 1 INPUT switch to R position e At Channel 1 press REF OFFSET pushbuttons to obtain 95 dB offset The CRT trace should b below the center graticule line This shows the noise floor below 95 dBm f Set Channel 1 INPUT switch t
90. erter OUTPUT LEVEL dBm e a 10 OUTPUT LEVEL VERNIER 53000540 Reed eadera d 0 INPUT LEVEL dBm rb ee Xue 10 On A2 Frequency Control RANGE MHZ la bee bees eid adie Soa 0 5 130 MODE oi ene ad P gere dca LIN EXPAND WIDTH Ou ka eere So Eds ot pd er editis Ae Pa e CW LAF OW FREQUENCY ciues Ba Pe eg a dee 60 MHz TAT FREQUENCY hice Sowa REN OR RES He AY 6 0 MHz SCAN TIME SEC vig cai soe nde tae 0 1 01 A2 33 Installation Model 8505A A257 PHASE ACCURACY AND ELECTRICAL LENGTH TEST Cont d A2 Frequency Control Cont d TRIGGER CER paco ERR ex AUTO MARKERS 1 voa E uu RE PRA I PE 60 MHz On A3 Signal Processor Channel 1 INPUT uy OM Duc deni em DC uae A dod rei ERA HOS PIT 90 DIV Channel 2 MODE oe CRT Display BW Bandwidth uet kR eve RESI WEE e 10 kHz Video Filter cus es eo ha UTR oe EX ae Off out b Connect equipment as shown in Figure A2 20 with two 24 inch matched cables con nected in series between Port and the 3 way power splitter c Offset the phase trace with the Channel 1 REF OFFSET pushbuttons to place a phase
91. ertion phase linearity is degraded 19 TRANSMISSION MEASUREMENTS DEVIATION FROM LINEAR PHASE This sequence lists the steps for a typical measurement of deviation from linear phase ose ee SUITE EULALIA DC ME rcc TUE E RU T APR UN SETUP Set signal levels Set frequency sweep Set CRT display CALIBRATION Connect through CHANNEL 1 B R PHASE 90 degrees division ELECTRICAL LENGTH B MODE as required usually PHASE x10 SCAN CLR if REL lighted Center marker press MKR then press and hold LENGTH AND VERNIER B for flat response b CHANNEL 1 ZRO while adjusting LENGTH MEASUREMENT Connect test device Electrical length MODE and sweep width if PHASE x10 SCAN selected must be same as calibration ELECTRICAL LENGTH LENGTH and VERNIER B for flat phase response in frequency range of interest Position measurement marker to read phase deviation Measuring deviation from linear phase is an alternative to measuring group delay made possible by the range of the 8505 electronic line stretcher Insertion phase consists of two components linear and non linear Devia tion from linear phase is a measure of the non linear component of insertion phase By compensating for the linear insertion phase component using the electrical length controls the deviation from linear phase over the frequency sweep can be measured directly Compared to group delay deviation from linear phase is a fun damental
92. f interest If MODE set to x1 or x10 read equivalent electrical length of test device from ELECTRICAL LENGTH display or if MODE set to PHASE x 10 SCAN calculate equivalent electrical length of test device using display value x 10 E Sweep width MHz x 1 2 meters This measurement determines the linear insertion phase required to equalize the electrical length of the reference and test channels with the test device installed Note that if PHASE x10 SCAN is selected the sweep width cannot be changed without affecting the calibration if 1 x10 is selected changing sweep width does not affect calibration To avoid the electrical length calculation required when the PHASE x10 SCAN mode is selected measure electrical length with a frequency sweep width of 8 333 MHz With this sweep width the ELECTRICAL LENGTH display reads the length in centimeters directly The wide range of the electrical length controls allow great latitude in the test setup but you should recognize the limitations For best accuracy in phase and electrical length measurements the maximum values listed elow for electrical length should not be exceeded ELECTRICAL RANGE MHz LENGTH MODE 0 5 13 0 5 130 0 5 1300 1 19 9 1 99 m 19 9 cm x10 100 10 0 m 100 cm PHASE x10 SCAN 1700 1700 1700 The values represent the sum of the calibration value and any length added during the measurement Above hese values ins
93. f scan width tcounter accuracy Time Base Accuracy 5 ppm ti ppm C 3 ppm 90 days OUTPUT CHARACTERISTICS Power Range 10 dBm to 72 dBm Accuracy Attenuator 1 5 dB over 70 dB range Vernier 1 dB Levelling 0 5 dB from 500 kHz to 1 3 GHz Impedance 5022 216 dB return loss at 10 dBm output level lt 1 38 SWR Spectral Purity Residual FM Frequency Range MHz 0 5 to 13 0 5 to 130 0 5 to 1300 Residual FM Hz rms 20 Hz 200 Hz 2 kHz 20 Hz 1 kHz 20 Hz 10 kHz 20 Hz 1 kHz Measurement Bandwidth Harmonies gt 25 dB below main signal at 10 dBm output level Typically gt 40 dB below main signal at 12 dB setting of vernier Sub harmonics and Spurious Signals Below 50 dBm at 10 dBm output level RECEIVER FREQUENCY RANGE 500 kHz to 1 3 GHz INPUT CHARACTERISTICS Input Channels Three channels R A and B with 100 dB dynamic range Maximum Input Level Selectable 10 dBm or 30 dBm input level Noise 10 kHz BW 110 dBm from 10 to 1300 MHz 100 dBm from 2 to 10 MHz 95 dBm from 0 5 to 2 MHz Typically 120 dBm using the 30 dBm input level position and 1 kHz BW Impedance 500 220 dB return loss lt 1 22 SWR Typically 226 dB return loss C1 11 SWR MAGNITUDE CHARACTERISTICS Frequency Response Absolute A 1 5 dB 100 Frequency MHz Ratio A R B R
94. flected and the B input is 3 ________ the transmitted signal MODE p POLAR PHASE DLY MAG PHASE Jt Y Frequency 180 4 B R B R t insertion Phase Gain H Deviation from amp x Am 2 insertion Loss Bo kinear Phase 8 S 180 o one Electrical Longth Delay Return Loss i Y Refiection Phase 180 Frequency amp Frequency Frequency Frequency p AIR Complex Reflection Coefficient B R Complex Transmission Coefficient The MAG PHASE and DLY selections use the cartesian display POLAR MAG and POLAR PHASE use the polar format R A and B INPUT positions can only be selected with MODE in MAG The MODE switch also selects the appropriate dB degrees microsecond or nanosecond units indicator near the measured value LED display The CRT trace is identical for both POLAR MAG and POLAR PHASE selections In POLAR MAG the dB ratio at the marker is displayed and in POLAR PHASE the phase angle at the marker is displayed For A R and B R INPUT selections the CRT trace and the measured value is always presented as the ratio of the test channel to the reference channel The SCALE DIV switch uses four scales The MAG PHASE and DLY scales set the value per division on the cartesian MAG 20 10 2 3 dB display the POLAR FULL scale establishes the linear trans DESEEMMEEENNEN mission or reflect
95. hase locked to a com mon reference and offset by 100 kHz with a YIG tuned swept oscillator provides continuous very linear 3 decade frequency sweeps and the precise local oscillator tracking required for narrow bandwidth detection High reliability thin film technology enables all three input mixers to have closely matched magnitude phase and delay characteristics with full 10 to 110 dBm dynamic range and greater than 100 dB isolation between inputs Transmission and reflection characteristics can be measured simultaneously by using two identical measure ment channels one for the reference input and one switched between the A and B test inputs on alternate sweeps Completely independent magnitude phase delay and polar detectors process the IF to DC levels for multiplexing to the CRT display The electronic line stretcher allows electrical length of the A and B test signal paths to be independently matched to the reference signal path by adding or subtracting up to 1700 degrees of linear phase shift per sweep prior to detection This technique virtuallv eliminates the need for mechanical line length adjustments and allows direct measurement of deviation from linear phase The group delay detector provides direct calibrated measurement regardless of sweep width or sweep rate Frequency magnitude phase and delay are read directly from digital displays by positioning a measurement marker to any point on the trace Frequency at the marker
96. he maximum group delay which can be displayed depends upon the RANGE MHz selection as follows 0 5 13 80 microseconds 0 5 130 8 microseconds and 0 5 1300 800 nanoseconds and is the sum of the calibration offset value and the actual measured value 21 MENTS This section describes return loss and reflection coefficient measurements These measurements are describ ed individually each with separate setup calibration and measurement sequences For a generalized calibra tion sequence for all reflection measurements refer to the S Parameter Measurements General Calibration Se quence Below is a diagram of reflection test connections using the 8502 Transmission Reflection Test Set Incident To Reflected To M Input i Pd EN Short Circuit gt To Calibrate RF Input 0 70 dB x Attenuator Test To Input B For best accuracy terminate test device output with high quality 500 or 750 Load Connections to the test set and test device are made using the cables supplied in the 11851A Cable Kit The test device input port is connected to the 8502 front panel TEST connector For reflection calibration connect the short circuit at the same point to which the test device will be connected Whatever configuration is used all cables adapters and fixtures required for the measurement should also be used during cal
97. he selected measurement marker in all sweep modes except CW In CW the counter uses the left hand FREQUENCY FREQ COUNTER MH MHz display to indicate the CW frequency Resolution of the FREQ COUNTER MHz display is controlled by RANGE MHz and SCAN TIME SEC selections Slow sweep times allow greater counter resolution shift one or more digits off the left of the display and cause the display OVERFLOW in dicator to light To obtain six digit counter resolution move SCAN TIME SEC to a faster sweep position to inspect the most significant digits then to a slower sweep position to inspect the least significant digits When the MARKERS rotary switch is moved to positions 2 through 5 all lower numbered markers are displayed on the CRT trace pointing down The selected measurement marker points up Polar Display The CRT trace is the same for both POLAR MAG and POLAR PHASE selections The measured value display reads the POLAR magnitude ratio at the measurement marker in POLAR MAG uis rhi and the phase angle at the measurement marker in POLAR PHASE MAGNITUDE PHASE 18 dB 45 DEG For POLAR MAG the displayed measured value is the same 201 MM 6 dB ratio as indicated for the MAG selection The magnitude part of the linear coefficient can be read from the concentric circles of the polar graticule or calculated using the REF MKR dB value and the HP Reflectometer Calculator HP p n 5952 0948 or the following equation Measu
98. hows a display of the magnitude ratio response of a bandpass filter The measurement marker is positioned to the minimum insertion loss point in the passband For this measurement no REF OFFSET has been added the 0 dB reference line is positioned at the top graticule using CH1 or CH2 4 so the displayed MKR value represents the insertion loss MKR dB EXE FREQ COUNTER MHz 100 Relative Measurements To measure the difference between two points on the trace select MKR display mode position the measure ment marker to the first point add or subtract REF OFFSET to make the MKR reading zero then move the marker to the second point The MKR reading at the second point represents the difference between the two points Calibration is retained using this sequence and the measured value always represents the sum of the REF and MKR values at any point 16 TRANSMISSION MEASUREMENTS same operation can be performed without preserving the original calibration value by positioning the marker to the first point pressing then ZRO hold until display zero the moving the marker to the second point Using this sequence a new calibration value is stored and all further measured value readings REF MKR will be relative to the first point instead of the original calibration value Thus both sequences are equivalent but the first sequence retains the original calibration value These se quences can also be used for magnitud
99. ibration 22 REFLECTION MEASUREMENTS RETURN LOSS This sequence lists the steps for a typical return loss measurement SETUP Set signal levels Set frequency sweep Set CRT display MARKERS 1 position measurement marker so FREQ COUNTER MHz reads desired calibration frequency CALIBRATION Connect short CHANNEL 1 A R MAG 10 dB division MKR ZRO hold until display zero MEASUREMENT Connect test device MKR ZRO moves marker to reference line Position measurement marker to read magnitude ratio MKR REF and frequency Calibration for return loss sets the magnitude ratio between the reflected and reference signals to zero dB with the short cir MKR FREQ COUNTER cuit After connecting the test device a negative value indicates that the reflected signal magnitude is less than the reference signal magnitude This figure shows a display of the return loss of a bandpass filter The measurement marker is positioned to the minimum return loss point in the passband The 0 dB reference line is set to the center graticule using CH1 CH2 and no REF OFF SET has been added so the absolute value of the MKR reading is the return loss measured value Standing wave ratio SWR can be calculated from the return loss measured value using the HP Reflectometer Calculator or these equations measured value dB p 10 where D 20 1 1 0 SWR For example
100. ication program which functionally checks ail parts of the 8507A system Test data on the pads is also provided Kit Includes Qty Description 1 APC 7 50 Q Termination lt 1 005 SWR at 2 GHz APC 7 Short Circuit APC 7 3 dB Pad with Test Data APC 7 50 dB Pad with Test Data Storage Case Dimensions 254 mm wide 64 0 mm high 19 mm deep 10 in x 2 in x 7 in Weight Net 0 91 kg 2 ib Shipping 1 36 kg 3 Ib 85032A 50 2 Type N Calibration Kit Function This kit is recommended for use with the 85034 S parameter Test Set or 8507A Automatic Network Analyzer for measurement of devices having Type N RF connectors Kit Includes Oty Description 2 APC 7 to Type N Female adapter 2 APC 7 to Type N Male adapter 1 50 Type N Female termination with 1 005 SWR at 2 GHz 1 50 Type Male termination with 1 005 SWR at 2 GHz 1 Type N Female short circuit 1 N Male short circuit 1 Storage Case Dimensions 254 mm wide 64 mm high 191 mm deep 10 in x 2 in x 7 in Weight Net 1 13 kg 41b Shipping 1 59 kg 3 Ib 85033A SMA Calibration Kit Function This kit is recommended for use with the 8503A S parameter Test Set or 8507A Automatic Network Analyzer for measurement of devices having SMA RF connectors Kit Includes Oty Description APC 7 to SMA Male adapter APC 7 to SMA Female adapter 50 Q SMA Female termination 50 Q SMA Male termination SMA Female short circuit SMA Male short cir
101. if SIGNAL GROUND P O Twisted Pair with 11 23 P O Twisted Pair with 10 22 P O Twisted Pair with 9 21 P O Twisted Pair with 8 20 P O Twisted Pair with 7 19 P O Twisted Pair with 6 18 Should be ground ed near termina tion of other wire of twisted pair REN 17 DIO8 16 DIO7 15 DIO6 14 DIOS 13 HP IB Logic Levels True low State lt 0 8 False high State gt 2 4 Model 8505A the accumulated cable length between instruments is too long the data and control lines cannot be driven properly and the system may fail to per form Therefore the following restrictions must be observed a With two instruments in a system the cable length must not exceed three meters 9 feet b When more than two instruments are con nected on the bus the cable length to each instrument cannot exceed two meters six feet per unit The total cable length between all units cannot exceed 20 meters 65 feet A2 28 Normalizer Interconnect Cable A2 29 When an 8501A Normalizer is used with the 8505A Network Analyzer the Normalizer In terconnect Cable connects to NORMALIZER IN TER CONN receptacle A3J1 Signal lines in the Normalizer Interconnect Cable are identified in Figure A2 8 A2 30 Test Set Interconnect Cable A2 31 When an 8503 or B S Parameter Test Set is used with the 8505A the Test Set Interconnect SHIELD Connected 11 to earth 10 SRQ ground by System 22 Ee Controller NDAC
102. ignal path selected by INPUT Move LO the INPUT switch to the other position to deselect length for e EC both channels The MODE switch selects the units for electrical length When MODE is set to x1 and x10 electrical length is introduced in units of meters or centimeters of equivalent air line as shown by the m or cm indicator above the display When MODE is set to PHASE x10 SCAN ten times the displayed degrees of phase shift is introduced over the selected frequency sweep The linear insertion phase added or subtracted is zero at the beginning of the frequency sweep increasing linearly to ten times the display degrees at the end of the sweep This degrees scan mode allows greater range than the x1 or x10 MODE selection and is usually required for devices with long elec trical length In the PHASE x10 SCAN MODE equivalent electrical length can be calculated from the displayed value us ing the following computation phase change degrees x 3 10 meters sec electrical length meters sweep width Hertz 360 degrees cycle display value x 10 sweep width MHz x 1 2 where display value represents the ELECTRICAL LENGTH display reading and sweep width represents the total selected frequency sweep in MHz For example if it is necessary to add 1350 degrees to flatten the phase response trace and the frequency sweep is from 1100 to 1110 MHz the equivalent electrical length compensa tion is REL NN 112 50 mete
103. ilar BNC to Type N Adapters HP 1250 0780 PROCEDURE A coaxial cable greater than 50 feet in length is used as a standard in the group delay test Group delay of the test cable is measured with the 8505A in phase mode as follows 1 Connect the Test Cable in A channel between the matched cable and the power splitter as shown in Figure A2 24 2 Set 8505A controls as follows On Al Source Converter OUTPUT LEVEL dBm core pepe BG 10 OUTPUT LEVEL VERNIER 0 0 INPUT LEVEL dBm MAX 10 A2 37 Installation A2 58 GROUP DELAY ACCURACY TEST Cont d On A2 Frequency Control RANGE MHZ papiros TAA 0 5 1300 MODE Lu Ou ER ERR MR ERE GS LIN EXPAND WIDTH ed ru cars EMO E ete Sue CW SCAN TIME SE wide e E RE weed 01 01 TRIGGERS RE Neha ORS Oe BRS EA AUTO MARKERS 3 exte p bey IE X aa 1 SCAN TIME SEC Midrange On A3 Signal Processor Channel 1 INPUT oe pl OE S we e a OE E ERR A R MODES S eb ote ed be baat aqu X Gua PHASE SCALE DIV RR GET Rau ated en eos 45 DEG Channel 2 MOD Eidos dp Na dti eg eios PAPE OFF Electrical Length INPUTS pee are baer ee qd ce p RU CR bles et coa RO EUR ar pct 3 4 5 2 38 Model 8
104. ion coefficient value of the polar display outer us Me koe Fong circle Note that the DLY scale uses additional scaling factors POLAR FULL 5 2 05 02 01 mer which depend on the RANGE MHz switch position As an exercise connect the RF output directly to one of the R A or B input connectors Set the INPUT LEVEL dBm MAX switch to 10 the OUTPUT LEVEL dBm VERNIER to 12 and the OUTPUT LEVEL dBm attenuator to 10 Rotate the VERNIER toward zero and note the setting at which the OVERLOAD indicator lights This is the simplest operator check you can make on the source and receiver The OVERLOAD indicator lights at about 2 dB of the INPUT LEVEL switch setting Make this test at each of the R A and B inputs using the 10 and or the 30 input switch settings To observe the CRT trace set CHANNEL 1 or CHANNEL 2 to R A or B MAG set SCALE DIV to 10 dB divi sion and repeat the above exercise If the trace does not appear set the CRT display as described on the next page INTRODUCTION SET CRT DISPLAY Pressing to detent the REF LINE POSN BEAM CENTER button displays the cartesian reference line or the polar beam center during the sweep retrace Standard controls are used for beam focus beam intensity scale il lumination and trace align This illustration presents a sequence for setting the cartesian reference line ani polar beam center positions pr i mt i i tenn he ep Depress REF LINE POSN BEAM C
105. irements for re shipment are also included A2 3 RECEIVING INSPECTION A2 4 Inspect the shipping container If it or the cushioning material is damaged keep it until the entire shipment has been checked for complete ness and the instrument has been checked mechanically and electrically Check the equip ment received in the shipment against the shipping manifest and equipment illustrations in Section 1 Check the 8505A operation with the Incoming In spection Tests in paragraph A2 49 If the shipment is incomplete or if the equipment is damaged or will not pass the Incoming Inspection Tests notify the nearest Hewlett Packard office If in addition the shipping container is damaged or the cushion ing material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the shipping materials for the carrier s inspection The Hewlett Packard office will arrange for repair or replacement of damaged equipment without wait ing for a claim settlement A2 5 ENVIRONMENTAL LIMITATIONS A2 6 Environmental limitations for the Model 8505A Network Analyzer are Temperature 0 C to 55 C Operating 40 C to 75 C stored or in shipment Altitude Barometric To 4572 metres 15 000 feet operating 15240 metres 50 000 feet stored or in shipment Humidity To 95 however instrument must be protected from temperature ex tremes that could cause condensation to form in it A2 7 BEN
106. is measured using a new up down counter which measures the local oscillator frequency and subtracts the 100 kHz offset This technique provides up to 100 Hz resolution and 2 count accuracy without the need to stop the sweep at the marker Magnitude phase and delay values are measured by sampling the selected detector outputs at the marker position An autoranging voltmeter displays the measured value with up to 0 01 dB 0 1 degree and 0 1 nanosecond resolution HP IB the Hewlett Packard Interface Bus is Hewlett Packards implementation of IEEE 488 INTRODUCTION TEST SETS The following test sets are designed especially for use with the 8505 For precision transmission tests or ratio tests using a stan dard device as a reference the 11851A RF Cable Kit and 11850A 500 or 11850B 759 Power Splitter provide the necessary RF connections and shielding with excellent magnitude and phase tracking characteristics over the 8505 fre quency range The 11850B includes three 509 to 759 Model 11852A minimum loss pads 11850A B Three Way Power Splitter The 8502A 509 or 8502B 759 Transmission Reflection Test Set contains a power splitter and directional bridge allow ing simultaneous transmission and reflection measurements It also includes a 0 to 70 dB 10 dB step attenuator which allows control of the incident signal level independent from the reference signal level The 8502B includes one 509 to 759 Model 11852A minimum loss pad
107. kHz range of values for d are shown on cor responding control in illustration above 7 HP IB CODE FAdddd Fadddd OPERATION DELAY REQUIRED PROCESSOR settling times COB BandWidth 10 kHz 1 kHz Video Filter C1 C2 CHANNELS 1 amp 2 To 1 final value To 01 final value C3 ELECTRICAL LENGTH switching ZRO CLR INPUT AND MODE resolution changes Resolution constant Autoranging TIME SEC TRIGGER START STOP AF CW to 0 01 OTHER HP IB COMMANDS Trigger The 8505A does not respond to a device Trigger Clear The 8505A does not respond to a device Clear Remote The Remote message will disable the 8505A front panel programmable controls It will retain the pre remote front panel settings until changed by program d Local The Local message or switching the 8505A off and on will return the 8505A to manual front control Lecal Lockout Disables local switch on 8505A front panel and presets vernier controis Any change affecting Reference Level includes REF OFFSET CLR INPUT MODE and 8503A B Test Set switching ZRO MKR amp REF mode CLR INPUT MODE and SCALE DIV Any change affecting LENGTH includes LENGTH CLR Channel 1 and 2 MODE INPUT and 8503A B Test Set Read marker value and determine if auto ranging occurs SOURCE settling times OUTPUT INPUT LEVEL dBm MAX SCAN E NNE
108. kHz i MHz 100 ms Sweep Time 1 kHz 4 10 kHz 100 kHz 271 second Sweep Time 100 Hz 1 kHz 10 kHz SOURCE General Characteristics Sweep Modes Linear Full Log Full Start Stop 1 Start Stop 2 Alternate CW AF and CW Sweep Times 10 ms to 100 seconds in decade ranges with vernier adjustment or manual sweep using vernier Trigger Modes Auto line sync single scan or exter nal sync up to 50 kHz rate with 22 Vpp and 21 trigger signal RF Output Connector Type N Female 1 7 General Information Model 8505A Table A1 2 Supplemental Characteristics 2 of 2 RECEIVER Input Damage Level 20 dBm or 250 Vde Full Scale Polar Magnitude Range 1 to 0 01 in a 1 0 5 0 2 sequence Electrical Length Linearity 0 5 x 1 2f MHz x 1 meters Linear Phase Substitution degrees scan Range 51700 per scan with 0 offset 1 4 km t4 7 usec scan width MHz scan width MHz Magnitude Offset Typical Maximum Offset between 10 and 30 dBm Input Level Position 0 2 dB excluding dynamic accuracy Typical Maximum Offset between 10 kHz and 1 kHz BW Positions 50 2 dB exluding dynamic accuracy Phase Offset Typical Maximum Offset between 10V and 30 dBm Input Level Position t 2 0 excluding dynamic accuracy Typical Maximum Offset between 10 kHz and 1 kHz BW Position lt 5 excluding dynamic accuracy General Characteristics RF In
109. ker 1 control to approximately 640 MHz On A3 Signal Processor set CHANNEL 1 INPUT switch to A R set MODE to MAG set SCALE DIV switch to 0 1 dB position and set VIDEO FILTER off out Press DISPLAY MKR then ZRO pushbutton On A2 Frequency Control adjust MARKER 1 frequency control between 0 5 MHz left end of CRT trace and 1300 MHz right end of CRT trace Note the highest and lowest reading on the Signal Processor Channel 1 readout The difference between the highest and lowest reading peak to peak variation due to frequency response should be 0 6 dB Set Signal Processor Channel 1 INPUT switch to B R Press DISPLAY MKR then ZRO pushbuttons Repeat preceding step m Installation A2 31 Installation Model 8505A A2 56 MAGNITUDE PHASE AND GROUP DELAY FREQUENCY RESPONSE Cont d PHASE MEASUREMENT FREQUENCY RESPONSE o Set MODE to LIN EXPAND WIDTH to START STOP 1 MARKERS switch to 1 position and Marker 1 control to mid position Set START to 0000 MHz STOP to 0750 MHz Set Channel 1 INPUT to B R MODE to PHASE and SCALE DIV to 2 degrees p Set WIDTH to START STOP 2 Set START to 0750 MHz and STOP to 1300 MHz Return WIDTH to START STOP 1 q Set ELECTRICAL LENGTH INPUT to B and MODE to LENGTH Press LENGTH pushbuttons to make the overall CRT trace as horizontal as possible It may be neces sary to press Channel 1 DISPLAY then ZRO to bring trace on CRT I Press Channel 1 DISPLAY then ZR
110. l 31 Option 007 provides the capability to ob tain data from the 8505A to 8501A Data ob tained from the 8505A includes front panel con trol settings frequency and Channel 1 and 2 marker measurement information The 8501A pro cesses this data and displays it on the 8505 as labels and graphics See Chapter F for further information A1 32 Option 907 Front Handles Kit 1 33 Option 907 consists of four front handles two for each 8505A chassis unit and the necessary hardware for attaching the handles The kit part number is HP 5061 0089 See Figure A2 2 A1 34 Option 908 Rack Flange Kit 1 35 Option 908 contains the flanges and hard ware required to mount the 8505A in an equip ment rack with 482 6 mm 19 inches horizontal Al 4 Model 8505A spacing The kit part number is HP 5061 0077 See Figure A2 2 A1 36 Option 909 Rack Flange Front Handle Kit 1 37 Option 909 consists of one Option 907 Front Handle Kit and one Option 908 Rack Flange Kit See above The kit part number is HP 5061 0083 See Figure A2 2 A1 38 Option 910 Additional 8505A Manual 1 39 Option 910 provides an additional 8505 Operating and Service Manual A1 40 ACCESSORIES SUPPLIED Al 41 Accessories supplied with 8505 Table of Accessories Interconnect Cable 08505 60231 HP IB Cable 0 5 meter 10631D HP IB Cable 2 meter 10631B One Y Type AC Power 8120 2231 or Cable Two AC Power Cables Two AC Power
111. lat trace at the reference line if the reference trace and the current trace are identical 31 To 8750A 8501A Processor 2kQ X 1 25V Normalizer 0 25 V display division HP IB Connection Signal Processor Address 71 To 85014 Normalizer Labeling Interconnect Option 007 9 0 10 V 2kQ 6 dB V ENSE ae a EED mD 0 200 mA current sink closed during sweep 2kQ 0 16 V 0 25 V display division BEAM INTENSITY x 10V Bright Source 10 kQ lt 50 kHz To 8503A HP 1B Connection 10V 22 V p p Test Set Source Converter 2 dB V 21usec Address 716 LINE VOLTAGE POWER MODULE FUSE 5 10 SELECTION Cable 08505 60021 Upper Lower between FREQUENCY 90 to 105 100V 1 5AT 20AT CONTROL INTER CONN 108 to 126 Vac 120V 1 5AT 2 0AT and SIGNAL PROCESSOR 198 to 231 Vac 220V O BAT 1 0AT INTER CONN is required 216 to 252 240V O BAT 1 0AT 8505A Rear Panel Connections 32 CONTROLS CET DISPLAY The response of both measurement channels can be displayed simultaneously with magnitude and phase response displayed in either cartesian or polar format BEAM CONTROLS Independent cartesian reference line position controls for each channel beam center for both channels and standard controls for beam and scale IF and VIDEO BANDWIDTH Select either 10 kHz or 1
112. ly A3 Each of these three chapters is divided into three sections con taining general information about the assembly a complete parts list for the assembly the assembly theory of operation and schematic diagrams and sufficient data for isolation of a failure within the assembly to the malfunctioning stage or compo nent Ai 4 DESCRIPTION 1 5 The 8505A Network Analyzer measures network performance in the frequency range of 500 kHz to 1300 MHz Three test input ports A B and each provide 100 dB of dynamic range The three test inputs are electrically identical with R used as the reference for ratio measure ments front panel adjustable line stretcher with an associated readout in meters and cen timeters enables the electrical length of the R input to be changed to match the electrical length of the test input This feature is used to compen sate for differences in test cable lengths and to measure the electrical length of a network under test Al 6 Any one of the three test inputs or the ratio of A R or B R can be selected for presenta tion on one or both of two identical but indepen dent display channels CHANNEL 1 and CHANNEL 2 These two channels each display signal magnitude phase deviation from linear phase and group delay of the under test device s transmission or reflection characteristics A selec tor switch enables all of these characteristics ex cept group delay to be displayed in ei
113. measurement because delay is the derivative of phase change with frequency Also greater phase sen sitivity allows a greater dynamic range than group delay measurements and deviation from linear phase will produce greater detail in areas where the phase response changes rapidly over a small frequency change This figure shows how introducing linear insertion phase electrical length allows determination of non linear insertion phase Deviation From Filter Response Electrical Length Added Linear Phase Response 2 Note that the same maximum electrical length considerations as for the electrical length measurements page 19 must be observed If the network exhibits large phase changes with frequency reduce the sweep width and make a series of measurements over the frequency range of interest This example shows the deviation from linear phase of a bandpass filter with markers at the 3 dB frequencies Even if the network must be specified in terms of group delay the deviation from linear phase measurement serves as a good check of the actual phase response Using the dual trace capability of the 8505A compare deviation from linear phase with the network group delay as described on the next page 20 TRANSMISSION MEASUREMENTS GROUP DELAY This sequence lists the steps for a typical group delay measurement SETUP Set signal levels Set frequency sweep Set CRT display MARKERS 1 position measurement marker so
114. measurements can be made in the forward or reverse direction using the measurement sequences described in the Transmission Measurements section Return Loss Return loss can be measured using FORWARD A R or REVERSE B R in either MAG or POLAR MAG mode Refer to the Return Loss measurement sequence in the Reflection Measurements section Impedance Using Smith Chart Impedance can be read directly from the polar display of reflection coefficient S or 5 by installing a Smith Chart overlay Smith chart overlays are supplied with the 8505 in four versions 3 16 1 0 0 5 0 2 and 0 1 full scale linear coefficient value of the outer circle For the 3 16 full scale version use REF OFFSET to set the REF value to 10 dB in POLAR MAG and select POLAR FULL 1 For the others set the REF value to zero and select the POLAR FULL value corresponding to the full scale value of the Smith Chart 29 The 8501A provides independent processing and storage for both 8505A measurement channels It serves as display memory for the 8505A by digitizing and storing measurement data at the 8505A sweep rate then output ting the processed trace to the CRT at a fixed display rate Computational capabilities permit real time averag ing and normalization and the magnifier can increase display resolution Also key 8505A Channel 1 and 2 measurement parameters are displayed as labels on the CRT With 8501A STORAGE ON the 8501A controls all information
115. mission calibration f Port 1 Port 2 Connect together Port 2 Connect Forward Connect Reverse for transmission Connect Reverse Short Short calibration Short 5 Transistor Bias Connect Forward BRIDGE BIAS 1 and 2 on the 8503A rear panel provide connections for 30 Vdc 200 mA bias when measur ing transistors Use a dual dc power supply such as the HP 62058 that is designed for use with bias tees optimiz ed for RF applications The HP 87178 Transistor Bias Supply is not compatible with the 8503A it is designed for bias tees optimized for microwave frequencies and may cause the test device to oscillate For common emitter configurations bias is established by setting Vee to the desired voltage then monitoring as Vy in combination with resistor R establishes the base current For common base configurations bias is established by setting Va to the desired voltage then monitoring as Veb in combination with R establishes emitter current R1 Veb 27 i i S PARAMETER MEASUREMENTS GENERAL CALIBRATION SEQUENCE When testing most two port test devices it will probably be most convenient to perform complete forward and reverse transmission and reflection calibrations at one time This sequence lists the steps for complete forward and reverse transmission and reflection calibration for all measurements SETUP Set signal levels Set frequency sweep Set CRT display
116. n Coefficient S1 Input Reflection Coefficient REVERSE S1 AIR Reverse Transmission Coefficient 5 Output Reflection Coefficient Thus the forward calibrations and measurements are made in exactly the same way as described in the previous Transmission and Reflection Measurements sections For reverse measurements the 8505 A and B in puts exchange transmission and reflection functions Connecting the 8503A test set rear panel interconection cable to the 8505A signal processor enables a second set of Reference Offset Stored Reference Offset Electrical Length Offset and Stored Electrical Length Offset registers allowing independent storage of forward and reverse magnitude phase delay and electrical length calibrations 26 S PARAMETER MEASUREMENTS Connections to the test device should be made using the 11857A Test Port Extension Cables or with the 11608A Transistor Fixture As shown in the following illustrations you may connect the test device directly to the 8503A Port 1 or Port 2 Using two cables balances the electrical length of the test set up Connecting the device directly to the 8503A port may reduce reflection errors at one port by reducing cable and adapter reflec tions Whatever configuration is used all cables adapters and fixtures required to make the measurement should also be used during calibration Two Cable System One Cable System Connect together for trans
117. nsitive setting if trace is off screen d Repeat step c with attenuator connected to input and Channel 1 INPUT switch to e Repeat step c with attenuator connected to B input and Channel 1 INPUT switch to pi Table A2 6 Dynamic Accuracy Table OFFSET from REF LINE External Attenuator Setting Channel 1 REF OFFSET Plus attenuator tolerance 10 dB 20 0 dB 0 20 dB 20 dB 10 0 0 1 dB 30 dB 0 d 0 00 dB 40 dB 10 0 dB 01 dB 50 dB 20 0 dB 0 2 dB 60 dB 30 0 dB 04 dB 70 dB 40 0 dB 0 6 dB 80 dB 50 0 dB 0 8 dB 90 dB 60 0 dB 1 dB 100 dB 70 0 dB 2 dB 110 dB 80 0 dB 4 dB A2 26 Model 8505A A2 55 PHASE DYNAMIC RANGE SPECIFICATION Phase Dynamic Accuracy in 10 kHz Bandwidth 0 02 degree dB from 20 to 40 dBm 0 5 degree from 10 to 50 dBm 1 degree from 50 to 70 dBm 3 degrees from 70 to 90 dBm DESCRIPTION Installation phase reference level is established on the CRT Then the signal at the receiver is changed through the dynamic range of the instrument and the change in phase indication is noted 8505 NETWORK ANALYZER RF OUTPUT 9 11018 STEP ATTENUATOR COAXIAL CABLES POWER SPLITTER Figure A2 17 Phase Dynamic Range Test Setup EQUIPMENT RE Cable Kit i ete NER RE HP 11851A 3 Way Power Splitter cse nnn HP 11850A Step Attenuator 0 1104 HP 8496A PROCEDURE
118. o The trace should be below the center graticule line Set Channel 1 INPUT switch to The CRT trace should be below the center graticule line A2 23 Installation 8505A A2 53 CROSSTALK ISOLATION AND RECEIVER NOISE FLOOR Cont d NOISE FLOOR FROM 2 TO 10 MHz h Set START frequency to 02 00 MHz and STOP frequency to 10 00 MHz At Chan nel 1 press DISPLAY REF then REF OFFSET pushbuttons to obtain 100 dB offset The CRT trace should be below the center graticule line This shows the noise floor below 100 dBm Set Channel 1 INPUT switch to The CRT trace should be below the center graticule line 1 Set Channel 1 INPUT switch to The CRT trace should be below the center graticule line NOISE FLOOR FROM 10 TO 1300 MHz k Set RANGE MHz switch to 5 1300 MHz Set START frequency to 0010 MHz and STOP frequency to 1300 MHz At Channel 1 press DISPLAY REF then REF OFFSET pushbuttons to obtain 110 dB offset The CRT trace should be below the center graticule line This shows the noise floor below 110 dBm 1 Set Channel 1 INPUT switch to The CRT trace should be below the center graticule line m Set Channel 1 INPUT switch to B The CRT trace should be below the center graticule line CROSSTALK ISOLATION n Al Source Converter set INPUT LEVEL dBm MAX to 10 dBm Connect equipment as shown in Figure 2 15 with RF OUTPUT cable connected to R inp
119. ode variations due to the source are cancelled Also A2 28 Model 8505A A2 56 MAGNITUDE PHASE AND GROUP DELAY FREQUENCY RESPONSE Cont d frequency response in group delay mode is read directly from the CRT trace by noting the deviation from the center graticule reference 8505A NETWORK ANALYZER POWER METER POWER SENSOR amp POWER SPLITTER TERMINATION Figure A2 18 Absolute Magnitude Frequency Response Test Setup EQUIPMENT Power Meter eroe BEER tee a HP 435A Power Sensors araea aai dk e e CR arate HP 8482A Three Way Power HP 11850A 50 Ohm HP 909A Option 012 PROCEDURE ABSOLUTE MAGNITUDE FREQUENCY RESPONSE a On 8505A set the controls as follows On AI Source Converter OUTPUT LEVEL secet ER RR 10 OUTPUT LEVEL VERNIER 10 INPUT LEVEL dBm MAX cece cee ence nn 10 On A2 Frequency Control RANGE MEHR x exse RD 0 5 1300 aea dena DAL tan o a eR aedis LIN FULL WIDTH sacar eit henge UL ere berg START STOP 1 SCAN TIME SEG ads ten EOS t sur que 1 1 SCAN TIME VERNIER Midrange NOTE it may be necessary to make slight adjustment at 0 50 MHz of Frequency Calibrate pot behind FREQUENCY CONTROL front panel See paragraph A2 51 steps d through i MARKERS 2652 08 ng REUS ELE Re 1 Mark r
120. odel 8505A Table 2 3 Rear Panel Recorder Outputs with Combinations of Front Panel Settings Channel 1 ofr MAGAor MAGBor PHASE B R POLAR A R or or ee __ MAGAR MAG BIR DELAY A R DELAY B R POLAR B R Channel 2 MODE OFF Consecutive Sweep Number 1 2 1 2 a 1 2 1 2 1 1 2 Rear Panel CH1 0 0 v i vi vi vi viel vie RECORDER cH2 0 06 0 o0 xil OUTPUTS swR X x x XJ X X X X Xx X X x XiP xp Channel 2 MODE MAG or MAG A R RearPanel CHi 0 0 yi vi v11o0 va v1 vi vil 0 vie 0 RECORDER cH2 Y2 Y2 Y2 72 v2 0 vol xiP ve swe x X X X X X X X X X x xP x Channel 2 MODE MAG B or MAG B R Rear Panel CHI 0 vi vif vit vil wif vi vie o RECORDER cH2 Y2 0 Y2 2 0 0 2 v2 xipl va OUTPPUWS swe X x x X X X X X Xx x x ix xpi x Channel 2 MODE MAG R Rear Panel CHi 0 9 v1 v1 1 vil vil vil o vie o RECORDER CH2 Y2 Y2 ve
121. oefficient by installing a Smith chart overlay Smith chart overlays are supplied with the 8505 in four versions 3 16 1 0 0 5 0 2 and 0 1 full scale linear coefficient value of the outer circle For the 3 16 full scale version use REF OFFSET to set the REF value to 10 dB in POLAR MAG and select POLAR FULL 1 For the other overlays set the REF value to zero and select the POLAR FULL value corresponding to the full scale value of the Smith Chart 24 With the INPUT switch set to B and the MODE switch set to the 8505 measures the absolute power level in dBm at the R A or B input Some applications for this capability are measuring and setting ac tual reference reflected and transmitted signal levels into the R A and B inputs prior to calibration verifying signal levels at various points in the test setup including actual incident and transmitted power and direct measurement of losses in the test set cables and fixtures E Du 7 or B MAG CLR hold for 2 sec if REL lighted SCALE DIV and REF OFFSET to position trace Position measurement marker to read measured dBm value MKR REF If desired convert dBm to mW using dBm 10 mW 10 EN The dBm difference between an R MAG and a B MAG measurement may not be identical to the B R MAG measured value The 8505A measures ratio values A R B R with greater accuracy than absolute power 2
122. onn Freq Control Sig Processor Inter Conn Test Set Inter Conn 85024 8 Test Device Test Device Set Signal Levels Set the INPUT LEVEL dBm MAX switch to 10 Use the OUTPUT LEVEL dBm and VER NIER to set the approximate signal levels to the test device Refer to the Power Level Measurements sequence on page 25 to measure the absolute power if necessary Select Measurement Set CHANNEL 1 INPUT switch to B R to select transmission MODE to MAG to select magnitude ratio and SCALE DIV to 10 dB division Set CHANNEL 2 MODE and ELECTRICAL LENGTH MODE to OFF Set CRT Display Press to detent REF LINE POSN BEAM CENTER to display reference line then use CH1 to set reference line to desired position usually center screen Set TRIGGER to AUTO Set Frequency Sweep Set RANGE MHz to lowest range that includes frequency range of interest Set sweeper MODE to LIN EXPAND and WIDTH to START STOP 1 Now use the FREQUENCY controls below the FRE QUENCY MHz displays to set the end points of the frequency sweep Read the end points of the frequency sweep from the FREQUENCY MHz displays Calibrate Connect through Set MARKERS switch to position 1 then use the adjacent vernier to set upward pointing measurement marker to desired calibration frequency Press CHANNEL 1 MKR then press and hold ZRO until the iterative zero process is complete and the trace moves to the reference line This establishes test set response at 0 d
123. pand the 8505A SCALE DIV selection For example with 0 1 dB division set at the 8505A and MAGNIFIER X10 selected the CRT display resolution is 0 01 dB division The data stored in memory is amplified prior to display and the MAGNIFIER expands the trace about the reference line or beam center position Frequency response of a cable using a 500 MHz sweep width and 0 01 db division is Sian san shown in this display Digitizer resolution produces the step ef fect each step represents a 0 002 dB change Passband Ripple at 0 01 dB division using x10 magnification Normalization Normalization is the process of storing a reference trace in memory and then automatically subtracting the reference trace from the incoming trace and displaying the difference Typical applications are to remove fre quency response characteristics of the test setup from the measurement or to make a comparison measurement in which the test device is matched to a standard Normalization is independent for Channel 1 and Channel 2 and is ordinarily used only for cartesian displays To normalize Connect standard open short through or standard device 8505A SCALE DIV same as for measurement MEMORY STORE momentary INPUT MEM S Connect test device When MEMORY STORE is pressed the displayed trace is transferred to reference memory Selecting INPUT MEM displays the difference between the reference trace and the current trace resulting in a f
124. pe N Connectors 2 required 15 24 plus Meters 50 plus feet of 50 2 Coaxial Cable Type N Right Angle Adapter Type N Male to Male Adapter Type N Female to Female Adapter Service Interconnect Cable 61 cm 24 inches Signature Analyzer Logic Pulser Logic Probe 16 Pin IC Clip on Connector 6 required Table 1 4 Recommended Test Equipment 3 of 3 Recommended Model HP 08505 60041 HP 08505 60042 HP 08505 60108 HP 11500A HP 1250 0176 HP 1250 0778 HP 1250 0777 HP 08505 60202 HP 5004A HP 546A HP 545A HP 1400 0734 Critical Specifications Model 8505A Use 50 ohm coaxial cable 182 88 cm long terminated on both ends with UG 21D U type N Male connectors 50 ohm type RG 223 U coaxial cable with BNC connectors on both ends Impedance 50 ohm Impedance 50 ohm No Substitute No Substitute No Substitute Any IC Clip Performance Test Adjustment T Troubleshooting Model 8505A Installation CHAPTER A MODEL 8505A NETWORK ANALYZER SECTION Il INSTALLATION amp INCOMING INSPECTION A2 1 INTRODUCTION A2 2 This section provides instructions for set ting up the Model 8505A Network Analyzer on a bench or installing it in a standard equipment rack Information about receiving inspection operation verification operating and storage environmental limitations and packing requ
125. presented on the 8505A CRT display The MKR and REF values on the 8505A measured value displays are not affected by 8501A processing All 8505A setup calibration and measurement sequences described in this note can be accomplished with STORAGE ON but the labeling interface must be connected to display the reference line or beam center Selecting 8501A STORAGE OFF bypasses the 8501A and returns the 8505A CRT to conventional analog operation To familiarize yourself with operation of the 8501A make these control settings then proceed with the follow ing paragraphs STORAGE OFF LABELS OFF MAGNIFIER X1 Channel 1 and Channel 2 INPUT OFF MEMORY VIEW OUT AVERAGING OFF Digital Storage When the device response characteristic requires a slow sweep to avoid distortion of the measurement select STORAGE ON Channel 1 and or Channel 2 INPUT ON Cartesian traces are digitized at 500 frequency points on the X axis and 500 points on the Y axis with 50 overrange on the Y axis available to digitize an off scale trace Similarly polar traces are digitized at 250 fre quency points with 50 overrange for both the X and Y axis Changing the reference line or beam center posi tion away from the middle of the CRT moves off scale points onto the display INPUT OFF blanks the Channel 1 or Channel 2 trace STORAGE HOLD freezes the CRT display for photography or further analysis and memory is not updated with new data on subsequent sweeps ERASE
126. put Connectors Type N Female CRT Reference Position Reference lines for Channel 1 Channel 2 and beam center in Polar may be independently set to any position on the CRT Display General Characteristics Cont d Display Bandwidth Selectable IF bandwidths of 10 kHz and 1 kHz A video filter position is also provided CRT Background ll umination control provided for CRT photography CRT Overlays Smith Charts 3 16 1 0 5 0 2 0 1 full scale Log Charts 10 MHz 100 MHz and 1000 MHz HP Part No 08505 60154 CRT Camera Adaptor Hewlett Packard 197A Option 006 camera is a direct fit Camera bezel adaptor model 103754 is required to convert the standard 197A camera to fit the 8505A display Auxiliary Outputs Channel 1 and 2 Outputs 0 25 V display division with 2 source impedance Sweep Output 0 25 V display division with 2 source impedance Pen Lift DC coupled 200 mA current sink Power Requirements 100 120 220 or 240 Vac 5 1095 50 to 60 Hz approximately 275 watts Total for Signal Processor and Source Converter Frequency Control units S 1 42 TEST SETS AND ACCESSORIES AVAILABLE 1 43 Test sets and accessories available for use with the 8505A are listed with their specifi cations in Table A1 3 1 8 A1 44 RECOMMENDED TEST EQUIPMENT 1 45 Equipment recommended for testing and troubleshooting the 8505A Network Analyzer is listed in Ta
127. r 8502A 50 Q Transmission Reflection Test Set 8502B 75 Transmission Reflection Test Set 11850A 50 Q Power Splitter 850B 75 Q Power Splitter 8503A 50 2 S Parameter Test Set 600B Transistor Fixture 11602B Transistor Fixture T 608A Option 002 Stripline Transistor Fixture 11608A Option 003 Stripline Transistor Fixture 11851A RF Cable Kit m Loss Pads provided with 11852A one Minimum Loss Pad provided with 8502B 11852A 509 10759 Minimum Loss Pad 11853A 50 0 Type N Accessory Kit 11854A 50 9 BNC Accessory Kit 11855A 75 0 Type N Accessory Kit 11857A Test Port Extension Cables 11858A Rigid Interconnect Adapter 85032A 50 Q Type N Calibration Kit Al 15 General Information Instrument Electronic Counter Power Meter and Sensor Spectrum Analyzer Oscilloscope Digital Voltmeter AC DC Function Generator Spectrum Analyzer AM FM Signal Generator Frequency Meter RMS Voltmeter Double Balanced Mixer 40 dB Low Noise Amplifier 0 kHz Low Pass Filter kHz Low Pass Filter Model 8505A Table A1 4 Recommended Test Equipment 1 of 3 Recommended Model HP 5340A HP 435A 8482A 8484A HP 436A 8482A 8484A HP 141T 8552B 8553B 8555A HP 180C 1801A 1
128. r Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or main tenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IM PLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSE QUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual General Information Model 8505A MODEL 8505A NETWORK
129. ransistor Base Patterns Model 11600B Accepts TO 18 TO 72 packages Will also accept any 3 or 4 lead packages with leads that lie on a 0 1 inch circle and whose diameters are 0 016 to 0 019 inch Model 11602B Accepts TO 5 TO 12 packages Will also accept any 3 or 4 lead package with leads that lie on a 0 2 inch circle and whose diameters are 0 016 to 0 019 inch Calibration References Included for calibration of the transistor fixtures are two calibration references a short circuit termination and a 50 2 through section Connectors Hybrid APC 7 precision connections Option 001 Type N Female connectors Recommended Accessory The 11858A Rigid RF cable Interconnect Adapter is recommended for measure ments using the 8503A S parameter Test Set Option 003 Includes 11858A Rigid Interconnect Adapter for use with 85034 Maximum Power 10W including RF signals Weight Net 1 1 kg 2 3 8 Ib Shipping 1 8 kg 4 1b Dimensions 44 mm wide 152 mm high 229 mm deep 1 3 4 in x 6 in x 9 in 1 10 Model 8505 General Information Table A1 3 Test Sets and Accessories 3 of 7 8503A 50 S PARAMETER TEST SET 8503B 750 S PARAMETER TEST SET i Port 1 5 13 dB 1 Port 2 13 dB I 6dB Coupling DC Bia 8503A RF Schematic Frequency Range 500 kHz to 1 3 GHz Impedance 50 Q Directivity 240 dB Frequency Response Transmission 521 12 1 dB 12 from 0 5
130. ration is checked against a known good elec tronic counter by monitoring the CW RF signal In CW AF mode the FREQUENCY READOUT is compared to the counter readout If necessary the CW RF signal is adjusted to match the FREQUENCY readout This calibrates the digital FREQUENCY readout to the actual RF OUTPUT signal being read on the built in counter The START STOP sweep signal frequency is measured using an external counter to monitor the frequencies with both START and STOP frequencies the same 8505A NETWORK ANALYZER ELECTRONIC COUNTER RF OUTPUT 10 dB ATTENUATOR Figure A2 12 Frequency Accuracy Test Setup EQUIPMENT Electroriic Counters os etos RM PIS HE pert HP 5340A 10 dB HP 8491B Option 010 A2 18 Model 85054 Installation 2 51 FREQUENCY RANGE AND ACCURACY TEST Cont d PROCEDURE COUNTER ACCURACY a Set 8505A Controls as follows On Source Converter OUTPUT LEVEL dBi 10 OUTPUT LEVEL VERNIER Fare 0 On A2 Frequency Control RANGE Mesi ess PR 5 1300 MODE ep rey Nee et ER he LIN EXPAND WIDTH eects CW SCAN TIME SEC conn xa dpa eg 10 1 VERNIER SCAN TIME Clockwise TRIGGER onsec rete ene eT ais AUTO MARKERS cile eco e Hee eaa eue secs 1 Marker P RENT en Mid position b Connect equipment as shown in Figu
131. ration should be accomplished at higher than or equal to the resolution at which the measurement is to be made Thus if high resolution measurements are made calibration should proceed as a two step process First set SCALE DIV to one of the four left hand positions press MKR then hold ZRO pressed until the display is zero Now move SCALE DIV to one of the four right hand high resolution positions and hold ZRO pressed until the display is zero again Notice that the display decimal point moves one digit to the left during the second step Offset values in the calibration registers cannot be displayed It is not necessarv to examine the calibration value following calibration because the value only represents the offset value necessary to remove the test set losses and offsets from the measurement The absolute value of the measurement is the sum of the calibration offset value the REF value and the MKR value but the instrument automatically subtracts the calibration value from the measurement and the test device response characteristic is represented by the MKR REF value alone Each time ZRO is pressed a new calibration offset is stored Thus for example if the measurement marker is not at the correct calibration frequency the first time ZRO is pressed the marker can be moved and ZRO pressed again Normally use ZRO only at calibration CLR can be pressed momentarily to clear the displayed REF value but holding it for about one second will cl
132. re A2 12 and set external counter resolution to 100 Hz SetCW FREQUENCY control and VERNIER control for 10 000 MHz indication on external Electronic Counter The 8505A CW FREQUENCY digital display should indicate 0010 00 MHz 0 02 MHz If the indication is not within tolerance the built in counter is malfunctioning go to troubleshooting in Chapter C FREQUENCY CALIBRATION d Set A2 Frequency Control WIDTH switch to CW AF Set CW FREQUENCY to 10 MHz and set CW FREQUENCY VERNIER to 0 f Set AF FREQUENCY to 000 0 and set AF FREQUENCY VERNIER to 0 g Remove the front panel window of A2 Frequency Control Figure A2 13 h Adjust FREQUENCY CALIBRATE 5 1300 MHz screwdriver adjustment in the middle of exposed subpanel so the FREQ COUNTER MHz reads 10 00 MHz plus or minus 2 counts of least significant digit LSD i Reinstall the window SWEPT FREQUENCY ACCURACY j At A2 Frequency Control set RANGE MHz switch to 5 1300 MODE switch to LIN EXPAND WIDTH switch to START STOP 1 and SCAN TIME SEC switch to 1 01 Set RANGE MHz switch and START and STOP frequency as listed in Table 2 5 below and read the frequency on the internal counter A2 19 Installation 2 51 FREQUENCY RANGE AND ACCURACY TEST Cont d LOCK TAB FREQUENCY CALIBRATE 5 1300 MHz RF OUTPUT FREQUENCY ADJUSTMENT PLASTIC WINDOW Model 8505A LOCK TAB 1 LOCK TABS TO LEFT ABOUT 1 2 IN
133. re the instrument s TWO ac inputs are set for the available ac line vol tage that the correct fuses are instal led and thatall normal safety precau tions have been taken Ai 19 Service 1 20 Although the instrument has been de signed in accordance with international safety standards the information cautions and warn ings in this manual must be followed to ensure safe operation and to keep the instrument safe SER VICE AND ADJUSTMENTS SHOULD BE PERFORMED ONLY BY QUALIFIED SER VICE PERSONNEL Al 21 Adjustment or repair of the opened in strument with the ac power connected s iould be avoided as much as possible and when unavoida ble should be performed only hy a sk d person who knows the hazard involved 1 22 Capacitors inside the instrument may still be charged even though the instrument has been disconnected from its source of supply A1 23 Make sure only fuses of the required cur rent rating and type normal blow time delay etc are used for replacement Fuse requirements are indicated on the instrument s rear panels Do not use repaired fuses or short circuit fuse hol ders 1 24 Whenever it is likely that the protection has been impaired make the instrument inopera tive and secure it against any unintended opera tion WARNING If this instrument is to be energized through an auto transformer for vol tage reduction make sure the com mon terminal is connected to the earthed pole of th
134. red Value torp 10 where D 20 Where and p represent the magnitude part of the linear transmission or reflection coefficient respectively and Measured Value dB represents the REF value For example if the REF value is 15 dB the magnitude part of the linear coefficient is 0 178 The phase value of the linear coefficient 24 is read from the radial lines of the polar graticule or by selecting POLAR PHASE and reading the REF MKR value from the measured value display 11 INTRODUCTION CALIBRATE Measurements on a test device are made relative to a measurement standard with known response characteristics Calibration establishes the offsets required to obtain a correct measured value for the measure ment standard using the same test set up as will be used for measurements on the test device The calibration standard for transmission measurements is a through connection connect the points at which the test device will be connected Complete transmission calibration sets the magnitude ratio between the transmitted and reference signals to unity 0 dB equalizes any electrical length difference between the transmitted and reference signal paths sets the phase to zero degrees and the group delay to zero seconds This establishes the transmission coefficient of the test set up as 140 with zero seconds group delay the theoretical value for a zero length transmission line The
135. riting programs to control it TRANSMISSION Transmitted Gain 88 Insertion Loss 48 Group Delay nsec usec Insertion Phase Deviation From Degrees Linear Phase Degrees 512 521 Electrical Length Transmission Coefficient cm m rZo i i FI sew 10 1 30 GHz dB incident Return Loss REFLECTION 571 522 Reflection Coefficient Basic 8505A Transmission and Reflection Measurements o 4 2100 GHz 4 Frequency Counter MHz Frequency Counter 800kHzto 1 3001 GHz 4 2099 GHz 100kHz Electrical Length Electronic Line Stretcher Test Magnitude Detector Polar Detector Phase Detector SWR Calculated Impedance Smith Overlay Reference pe Magnitude Detector Dual Trace CRT The 8505 is high performance RF network analyzer that includes leveled source frequency counter two measurement channels dual trace CRT with both cartesian and polar displays digital readout of the measured value and an electronic line stretcher Together with appropriate signal routing accessories the 8505A is a fully integrated stimulus response test system that m
136. rs 1110 1100 1 2 Electrical length calibration is accomplished by selecting the A or B input equalizing the electrical length with the calibration standard connected then pressing the ELECTRICAL LENGTH ZRO button The displayed value is stored in the selected Stored Electrical Length register as the calibration electrical length offset and the display is set to zero The REL indicator lights to indicate that a non zero calibration value is stored and that the display value is relative to the calibration value Press and hold CLR until the REL light goes out to reset the stored calibration value to zero Each time ZRO is pressed the displayed value is added to the stored calibration value meters 14 SMIS This section describes transmission insertion loss and gain insertion phase electrical length deviation from linear phase and group delay measurements These measurements are described individually each with separate setup calibration and measurement sequences For a generalized calibration sequence for all transmission measurements refer to the S Parameter Measurements General Calibration Sequence Below is a diagram of transmission test connections using the 8502 Transmission Reflection Test Set 8505A Transmitted to Input B Input R Through to Calibrate RF Input 0 70 dB Attenuator
137. ss ELECTRICAL LENGTH DISPLAY CLR Installation A2 35 Installation Model 8505A A2 57 PHASE ACCURACY AND ELECTRICAL LENGTH TEST Cont d o With ELECTRICAL LENGTH offset pushbuttons put in 1800 degrees of electrical length The electrical length readout displays 180 Verify that five transistions are displayed and that the linear phase display limits over approximately the last 576 of the trace See Figure A2 23 Photo A 1800 A B 1800 f f ME REEF ESTEE LIMITING LIMITING lt 5 lt 909 lt 5 lt 90 Figure A2 23 Phase Trace with Maximum Electrical Length Added p Reduce electrical length with LENGTH pushbuttons until the limiting section just goes off screen The digital readout at ELECTRICAL LENGTH panel should be gt 173 71730 degrees q With ELECTRICAL LENGTH offset pushbuttons put in 1800 degrees of electrical length The electrical length readout displays 180 Verify that five transitions are displayed and that the linear phase display limits over approximately the last 5 of the trace See Figure A2 23 photo B r Reduce electrical length with LENGTH pushbuttons until the limiting section just goes off screen The digital readout at ELECTRICAL LENGTH panel should be equal to or more negative than 173 equal to or more negative than 1730 degrees L
138. ter graticule line d Step external step attenuator from 10 to 50 dB position This applies 50 dBm to ports A and R The CRT trace should be within 0 5 degree of Reference Line e Step the external attenuator from 50 to 70 dB position This applies 70 dBm to ports A and R The CRT trace should be within 1 degree of Reference Line f Step the external attenuator from 70 to 90 dB position This applies 90 dBm to ports A and R The CRT trace should be within 3 degrees of Reference Line A2 56 MAGNITUDE PHASE AND GROUP DELAY FREQUENCY RESPONSE SPECIFICATION Absolute Magnitude Frequency Response lt 1 5 dB Magnitude Tracking Frequency Response lt 0 3 dB Phase Frequency Response lt 3 from 0 5 to 750 MHz lt 5 from 750 to 1300 MHz Group Delay Frequency Response lt 1 ns 0 5 to 1300 MHz DESCRIPTION The receiver magnitude frequency response is tested by applying the RF OUTPUT first directly to the three individual ports If the indication is slightly out of specifications the RF OUTPUT is sent through a power splitter to one of the INPUT ports and to a power meter The common mode power variations due to the source as indicated on the power meter is subtracted from the variations on the CRT trace giving a resultant variation due only to the receiver and display section The receiver frequency response in ratio measurement mode may be red directly from the CRT display since all common m
139. terms is given in Table A3 7 A summary of codes to com mand the 85054 is given in Tables A3 2 and A3 3 Figure A3 5 gives the 8505A programming codes in pictorial form Some programming functions require programmed time delays to allow comple tion of an operation These are listed in Table A3 4 A3 1 A3 2 8505A 0000 99 October 1979 Supersedes none Programming Code Summary for 8505A RF Network Analyzer INTRODUCTION FOR ALL ELECTRICAL LENGTH codes This programming note contains a summary of the CO for the BandWidth code HP IB codes used in the 8505A and their functions b Use the letter E to separate all R is intended for use by those familiar with both the and D program statements and to end the 8505A and HP IB programming Refer to the 8505A programming string Operating and Service manual for a complete 2 The last digit programmed in REFerance explanation of the codes and functions OFFSET may not be displayed on the front panel LEDs ADDRESS TABLE _ Instrument Talk Listen Decimal Source Program Convention 8505A Processor P 0 16 1 The Source codes may be sent in any order except 8505A Source S 3 19 a Range Mode and Width W codes The addresses may be changed by removing instru Should precede FA and FB codes ment covers and setting appropriate slide switches b The letter E used to end the on the HP IB circuit boards For detailed instructions
140. the reference line value for that channel thus moving the CRT trace in rela tion to the reference line Holding a REF OFFSET button pressed increments the associated LED numeral at the rate of about two NS digits per second Momentarily pressing the CLR button resets dire the reference line value for that channel to zero Coarse Medium Fine There is no accuracy advantage in moving the CRT trace closer to the reference line to make the measure ment In fact the MKR value is correct even when the CRT trace and the measurement marker are positioned off screen However when the SCALE DIV switch is at one of the four right hand positions and the REF or MKR value is less than about 8 dB 80 degrees or 8 delay units the displayed REF or MKR value gains an additional decimal digit of resolution To see this change select MKR mode move SCALE DIV to one of the four right hand positions and use REF OFFSET to move the CRT trace toward and away from the reference line 10 INTRODUCTION Using REF OFFSET the magnitude phase and delay trace positions can be set independently The REF value is stored in six independent Reference Offset registers three for each channel one for each of the MAG PHASE and DLY selections The POLAR MAG position shares the same Reference Offset register as the MAG position and POLAR PHASE shares the PHASE register Frequency Counter The FREQ COUNTER MHz display indicates the frequency in MHz at t
141. ther rectan gular or polar coordinates Group delay is dis played in rectangular coordinates only Digital readouts of the displayedicharacteristics are also provided on the 8505A Al 7 The 8505A s internal signal source pro vides seven selectable test signal modes logarithmic full range sweep linear full range sweep linear expanded sweep selected start stop end points No 1 linear expanded sweep No 2 linear expanded sweeps No 1 and No 2 alter nately displayed on display channels 1 and 2 re spectively CW AF and CW Logarithmic full range and linear full range swept signals are pro vided in three selectable ranges 500 kHz to 13 MHz 500 kHz to 130 MHz and 500 kHz to 1300 MHz Al 8 The Hewlett Packard Interface Bus HP IB allows both the Frequency Control and the Signal Processor of the 8505A to either receive instruc tions from or send data to a remote controller The Learn Mode of the HP IB enables the controller to store or learn the state of the 8505A manually set front panel controls so it can recall this infor mation as needed 1 1 General Information Al 9 three major assemblies Al A2 and A3 of the 8505 are contained in two chassis units stacked one on top of the other and mechan ically locked together The lower unit contains the RF Source Converter Assembly A1 and the Fre quency Control Assembly A2 The top unit con tains the Signal Processor Assembly A3 and its associate
142. ured value for any of the S Parameters can be read directly from the polar display graticule The magnitude ratio for transmission p for reflection is read from the concentric circles and the angle read from the radial lines Also see page 11 Magnitude and phase values can also be read using the measurement marker as follows p oo gee eee 7 Position measurement marker to desired point on trace Select A R or B R Select POLAR MAG Read magnitude ratio MKR REF Calculate linear magnitude coefficient using Measured Value 20 109 where D Select POLAR PHASE Read phase angle 2 MKR REF The S Parameter displayed is determined by combination of the 8503 S PARAMETER SELECT switch and 8505 CHANNEL 1 or CHANNEL 2 INPUT switch position 8503A S PARAMETER S PARAMETER 8505A MEASUREMENT SELECT INPUT S FORWARD INPUT REFLECTION 5 FORWARD B R FORWARD TRANSMISSION S REVERSE AIR REVERSE TRANSMISSION 5 REVERSE B R OUTPUT REFLECTION For a device with greater than unity gain the transmission SCALE DtV coefficient will exceed 1 and REF OFFSET must be added to Se REF lace the full trace within the outer circle Adding 20 dB of REF POLAR futtis 5 2 02 4 1 0 OFFSET changes the polar full values by a factor of 10 as es e SN Su 2004 Electrical Length Deviation from Linear Phase Group Delay These
143. ut and the two 50 Ohm terminations to A and B input ports Set OUTPUT LEVEL dBm switch to 10 dBm p At Channel 1 press DISPLAY REF then REF OFFSET pushbuttons to obtain 110 dB of offset Set INPUT switch to The CRT trace should be below the center graticule line for 100 dB of isolation q At Channel 1 set INPUT switch to and the CRT trace should be below the center graticule line r Move the RF OUTPUT cable to input port and connect the two 50 Ohm term inations to R and A input ports Set INPUT switch to R and the CRT trace should be below the center graticule line for 100 dB of isolation 8 At Channel 1 set INPUT switch to and the CRT trace should be below the cen ter graticule line A2 24 Model 8505A Installation A2 54 MAGNITUDE DYNAMIC ACCURACY TEST SPECIFICATION Magnitude Dynamic Accuracy DESCRIPTION 0 01 dB dB from 20 to 40 dBm 0 2 dB from 10 to 50 dBm 0 5 dB 50 to 70 dBm 1 dB from 70 to 90 dBm 2 dB 90 to 100 dBm 4 dB from 100 to 110 dBm IA AUN ANA The signal level into the receiver is adjusted by setting the external step attenuator The signal trace is monitored on the CRT and deviation from the expected position ofthe trace on the graticule is noted 8505A NETWORK ANALYZER Figure A2 16 Dynamic Range Test Setup EQUIPMENT 0 110 dB STEP ATTENUATOR calibrated at 30 7

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