Home

HP5262A Manual

1. i Section IV Figure 4 6 lees GENERATOR ASSEMBLY 5262 65 c CC CDS cmm a PLUG IN ON SIG TO J3 41 555 9 OR J3 40 550 I5V ON PIN 14 UF EMITTER 22 FOLLOWER START OR STOP Q4 TIME TRIG 2N2048 528 6 20V J3 1 46 OR J3 47 js FOLLOWER ore 9 256 L gt Os 15V y 9016 cour 2N2048 e Sey ov ov TRIG R294 20V Sac us 52 2700 gt STAR T OR SIAR c7 RI6 RIB RIS 13V R32 qiue E a 820 R32 J3 21 OR J3 22 CR3 El 1910 0016 P RAA 19845 1910 1910 LM pace 15206 R21 13 13 422 TEST POINT 13V R26 220 EFERENCE DESIGNATIONS WITHIN TRIGGER 7 ASSEMBLY ARE ABBREVIATED MPLETE DESIGNATION ADD ASSY ESIG N A3 OR A4 AS PREFIX TO NDICATED DESIGNATION e PULSE TO COUNTER INPUT 1 ON START CHANNEL NC ON STOP CHANNEL A3 OR A4 TRIGGER GENERATOR ASSEMBLY PLUG IN ON SIG START OR STOP TIME TRIG PULSE TO COUNTER INPUT ON START CHAN NC ON STOP CHANNEL START OR STOP SIG TRIGGER LEVEL 05262 D Figure 4 6 Switch and Trigger Generator 4 7 4 8 5262 Section V Paragraphs 5 1 to 5 6 SECTION V REPLACEABLE PARTS 5 1 INTRODUCTION 5 2 This section contains information for ordering replacement parts Table
2. REFERENCE DESIGNATIONS WITHIN INPUT SWITCH ASSEMBLY ARE SB ABBREVIATED TO FORM COMPLETE DESIGNATION ADD ASSEMBLY 15V DESIGNATION OR A2 AS PREFIX TO INDICATED DESIGNATION RT FEEDBACK gt 2 EMITTER isv 5 FOLLOWER al 1853 0003 1999 O O1UF ud r RI 5 98 8K 4700 03 START OR sia dU i STOP ov INPUT FROM CR CR2 Nas RIA Ji OR J2 1901 1901 12 220 L 0033 0033 TO SIA E NUR RIS COM SEP 2 680 SWITCHING A 21708 2 R6 FEOV cd 2000 RII RIS ZERO SET 429 620 330 13V 47 EIE C5 LO 20V 20 R5 FROM 300K J3 20 5 t 13V 13V 1 505 1 j IM bu grow 15 zd ov RT J3 15 301 1 12 C7 T l IOM 2 R9 680 15V FROM J3 15 1 2 W SIC 9 15V SLOPE FROM J3 15 E REFERENCE Ji DESIGNATIONS PREFIX PREFIX NOTES OR A2 A3 OR J2 1 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE IN PICOFARADS RESISTORS 1 4 WATT 62 BY HEWLETT PACKARD COMPANY COPYRIGHT 19 amp TRIG GEN ASSY 4 50 62 T 217A 5262A INPT SW 01290 4 TRIGGER 75 LEVEL ALOR A2 INPUT SWITCH ASSEMBLY SIA M A3 START OR A4 STOP TRIGGER GENERATOR ASSEMBLY 5262 654
3. OPERATING AND SERVICE MANUAL MODEL 5262A TIME INTERVAL UNIT SERIALS PREFIXED 516 This manual applies directly to Model 5262A d Time Interval Unit having serial number prefix 516 This manual with changes provided in the Appendix also applies to Models having serial prefix numbers 450 229 and 217 E Copyright HEWLETT PACKARD COMPANY 1962 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A 01290 4 Printed MAY 1965 Model 5262 tere lr obi OEA O A a M nn Table of Contents Lists of Illustrations and Tables TABLE OF CONTENTS acm n iiS i Section Title Page Section Title Page I GENERAL INFORMATION 5 1 1 III PRINCIPLES OF OPERATION 3 1 1 1 Introduction 1 1 3 1 Introduction 3 1 1 4 Description 1 1 3 3 Trigger Generator 3 1 1 6 Applications 1 1 1 1 Unpacking and inspection 1 2 IV MAINTENANCE 4 1 1 13 Storage and Reshipment 1 2 4 1 Introduction 4 1 4 3 Test Equipment 4 1 4 5 Troubleshooting 4 1 OPERATING INSTRUCTIONS 2 1 4 8 Servicing Printed Circuit Boards 4 1 2 1 Introduction 2 1 4 10 Adjustments After Repair 4 2 2 3 Installation 2 1 4 14 In Cabinet Performance Check 4 2 2 5 Controls 2 1 2 10 Eliminating DC Component from REPLACEABLE PARTS 45 1 Sine Wave Inpu
4. lt m m e a 15V R7 2000 EMITTER 5 5 FOLLOWER R9 221 41 1853 0003 7900 OW gt 98 8K CRI 1901 1901 0033 0035 R3 34 8K R8 R6 91K 2000 ZERO SET Fay Ti3V 20 1UF 13V T 4 UF 15V 0 6 5 FEEDBACK 13V 43 AMPL R22 20V FOLLOWER cs Qa 2N2048 R23 R27 O O1UF sio 160 28 16 FOLLOWER 12 05 5 TI 2N2048 2 Le 5 m L TRIG6 c9 S g 2 RIS 820 24708 2700 4700 CR3 EI 1910 0016 e RIT 5 RIS 1000 1910 1910 R20 620 330 0016 0016 4500 c6 22 Qs T 13V 13V iced ue E TEST POINT 13V R26 220 ov REFERENCE DESIGNATIONS WITHIN TRIGGER GENEP 7 ASSEMBLY ARE ABBREVIATED TO FO MPLETE DESIGNATION ADD ASSY DESIGR OR 4 AS PREFIX TO INDICATED DESIGNATION RI2 56 3 7 PULSE TO COUNTER INPUT 3 1 ON START CHANNEL NC ON STOP CHANNEL CW TRIGGER 75 LEVEL A3 OR A4 TRIGGER GENERATOR ASSEMBLY OR A2 5V 14 PLUG IN INPUT SWITCH ASSEMBLY PLUG IN ON SIG ENABLING ig START OR IRENCE START STOP TIME ATTEN ATIONS i TRIG gt TRIG PULSE TO COUNTER D INPUT ON START CHAN START OR STOP SIG PREFIX 1 A3 OR A4 J2 1 MULTIPLIER i Ir NC ON STOP CHANNEL D 112 5 TRIGGER LEVEL
5. COUNTER rA LD M 555 Figure 3 2 Block Diagram of 5262A 65A Trigger Generator Assembly 3 0 01290 1 w Model 5262A Section Paragraphs 3 1 to 3 6 SECTION PRINCIPLES OF OPERATION 3 1 INTRODUCTION 3 2 The Model 5262A has two independent channels one for start pulse the other for stop pulse Each channel includes an attenuator circuit followed by an amplifier and Schmitt trigger The block diagram figure 3 1 shows the main functional sections and signal flow through the Model 5262A For each time interval measurement the counter receives two neg ative pulses a start pulse and a stop pulse The start pulse opens a signal gate within the counter which then counts one of its internal frequencies or an exter nal frequency until the stop pulse closes the signal gate 3 3 TRIGGER GENERATOR 3 4 GENERAL The trigger generator forms the pulses which start or stop the time interval measure ment Signal flow initiating the output pulses can be traced on the block diagram figure 3 2 Paragraphs 3 5 through 3 12 describe the circuits included in the trigger generator assembly in more detail 3 5 AMPLITUDE LIMITER Figure 3 3 shows the circuit with input and output waveforms Under nor mal operation diodes CR1 and CR2 act as low resist ance elements However positive peak overloading back biases CR2 and negative peak overloading back biases CR1 Thus no signal level beyond the bias
6. 300 C8 0140 0204 C fxd mica 47 pf 5 500 vdew C9 0140 0145 C fxd cer 22 uf 5 500 C10 thru C12 0150 0093 fxd cer 0 01 uf 80 20 100 vdew 3 See introduction to this section 01290 2 5 3 Model 5262 Section V Table 5 8 Table 5 3 Trigger Generator Assy 5262A 65A designations prefixed A3 or A4 Cont d Circuit me pm Reference Description 0683 2215 comp 220 ohms 5 1 4 W 0683 1035 comp 10K ohms 595 1 4 W 0683 1635 comp 16K ohms 5 1 4 W 0683 2725 comp 2 7K ohms 5 1 4 W 0683 2435 fxd comp 24K ohms 5 1 4 W 0683 2725 fxd comp 2 7K ohms 5 1 4 W 0683 2435 fxd comp 24K ohms 5 1 4 W 0683 2025 fxd comp 2K ohms 5 1 4 W 0683 3915 fxd comp 390 ohms 5 1 4 W 9130 0018 Transformer pulse 10 uh 4 See introduction to this section 01290 1 5 5 eae et E oM cocks esee cum idis ron E Section V Model 5262A Table 5 4 Table 5 4 Replaceable Parts Stock No Description Mfr Part No 0370 0076 Knob TRIGGER LEVEL 0370 0076 0370 0077 Knob FUNCTION 0370 0077 0370 0102 Knob TRIGGER SLOPE 0370 0102 0370 0110 Knob MULTIPLIER 0370 0110 05262 0001 Board Mounting Bracket 05262 0001 05262 2002 Panel Front 05262 2002 5262A 19A Switch attenuator 5262A 19A 5262 40 Knob skirt TRIGGER LEVEL 5262A 40A
7. 17 Ji FRONT PANEL START SK e pele tee BRL wow PLUG IN ON SIG J2 FRONT PANEL 1 33 REAR 49 START TIME TRIG STOP TIME TRIG REFERENCE DESIGNATIONS NOTES 1 UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS 2 ABBREVIATIONS DP DECIMAL POINT MU MEASUREMENT UNIT RC REMOTE CONTROL COPYRIGHT 1962 BY HEWLETT PACKARD COMPANY 52624 TIME INT UNIT 4 30 62 T 217 Figure 4 5 Overall Functional Diagram 4 6 44 t PLUG IN ON SIG 7 16 START TIME TRIG START TIME TR 12 516 3 yx ee cL Mtr CE NNI reU MD A SIB 4 com om ia 2 I 1 252001 a gt 10 ozo 1 5 at C Bu Az PLUG IN ON SIG 16 MU ENABLING DET ANGE E d 170 4222 OFF SIG i5 V SE ENABLING STOP SIG 4170V EXE 20V 15V 13 Boe eal dee lov 25 23 21 19 17 15 13 9 REAR 49 39 37 35 33 27 VA KRKRARA AA ein a a a sw 47 Ve START TIME TRIG 170 TO RC WHEN PLUG IN OFF lt 7 Ve STOP TIME TRIG 170V TO RC WHEN PLUG IN OFF Model 5262 A2 INPUT SWITCH ASSEMBLY START OR STOP TRIG E PLUG IN 14
8. 5 Connect signal to START or STOP with selector 10 Adjust start MULTIPLIER and TRIGGER LEVEL at common to START and STOP at other posi controls to set measurement start point at tions of selector switch desired voltage level 6 Set COM REMOTE SEP to 11 stop channel SLOPE control to if you a COM if start and stop signals are from want measurement to stop on positive going same source part of signal Set to if you want to stop b REMOTE if the Model 5243L is being op count on negative slope erated from a remote control box c SEP if start and stop signals are from 12 Adjust stop MULTIPLIER and TRIGGER LEVEL different sources controls to set measurement stop points at de sired voltage level 7 Se TIME BASE switch to obtain greatest pos sible count or to EXT if an external time unit is to be used 13 Read time interval units Figure 2 4 Operating the Model 52624 01290 1 2 3 Section II Figure 2 5 Set FUNCTION to REMOTE OR TIME INT Set SAMPLE RATE position just before POWER OFF MAX SAMPLE RATE Set TIME BASE switch to obtain greatest pos sible count or to EXT if an External Freq is counted to give an answer in degrees Set COM REMOTE SEP to Set start and stop TRIGGER SLOPE to same polarity Set both START and STOP MULTIPLIER con controls to 0 1 position Set both start and stop TRIGGER LEVEL con trols to 0 position Connect
9. 5262 40 Knob skirt MULTIPLIER 5262 40 9262A 65A Assy trigger generator 5262A 65A 557 023 U2P034R 0130 0008 C var cer 8 50 pf 0140 0145 C fxd mica 22 pf 5 500 vdew DM15C 2203 0140 0149 C fxd mica 470 pf 5 300 vdew DM15F471J 0140 0151 fxd mica 820 pf 2 300 DM15F821G 0140 0202 fxd mica 15 pf 5 500 DM15C150J500V 0140 0204 C fxd mica 47 pf 5 500 vdew DM15E470J3 0150 0029 fxd TiOo 1 pf 410 500 Type JM obd 0150 0042 fxd TiO 4 7 pf 5 500 Type JM obd 0150 0093 fxd cer 0 01 80 20 100 TA obd 0160 0127 fxd cer 1 uf 20 25 vdew 5C13 0160 0178 0160 0181 0160 0182 0160 0183 0180 0100 fxd mica 27 pf 5 300 fxd mica 30 pf 5 300 fxd mica 47 pf 59 300 vdew fxd mica 130 pf 5 300 fxd ta elect 4 7 uf 10 35 DM15E270J300V DM15E300J300V DM15E470J3300V DM15E131J300V 150D475X9035B2 0683 1025 fxd comp 1K ohms 5 1 4W CB1025 R 0683 1035 fxd comp 10K ohms 5 1 4W CB1035 0683 1055 fxd comp 1M ohm 5 1 4W CB1055 0683 1065 fxd comp 10M ohms 5 1 4W CB1065 R 0683 1135 fxd comp 11K ohms 559 1 4W CB1135 0683 1615 fxd comp 160 ohms 5 1 4W CB1615 0683 1635 fxd comp 16K ohms
10. ROTATIONAL SPEED High speed rotation can be measured using a photomultiplier pickup to scan a shaft which has been prepared with alternately reflective and non reflective surface Speed deter minations for slow speed shafts can be made in a small fraction of a revolution from an optical pickup Scanning a pattern of closely spaced lines 1 11 UNPACKING AND INSPECTION 1 12 If the shipping carton is damaged ask that the carrier s agent be present when theinstrumentis un packed Inspect the instrument for damage scratches dents broken knobs etc If the instrument is dam aged or fails to meet specifications Performance Check Para4 14 notify the carrier and the nearest Hewlett Packard field office immediately field offices are listed at the back of this manual Retainthe ship ping carton and the padding material for the carrier s inspection field office will arrange for the re pair or replacement of your instrument without waiting for the claim against the carrier to be settled 1 13 STORAGE AND RESHIPMENT 1 14 PACKAGING To protect valuable electronic equipment during storage or shipment always use the best packaging methods available Your Hewlett Packard field office can provide packing material such as that used in original factory packaging Contract packaging companies in many cities can provide dependable custom packaging on short notice If original materials are unavailable proceed as follow
11. W R fxd mfgl 39 2K ohms 1 1 10 W obd obd 0757 0125 fxd mfgl 98 8K ohms 1 1 10 obd 1250 0083 Connector female type UG 1094 U UG 1094 U 1251 0099 Connector male 50 pin 57 10500 1251 0135 Connector 15 pin for SD 615UR Special 2N2048 HA9079 2N708 1850 0091 1853 0003 1854 0005 Transistor 2N2048 Transistor Si PNP Transistor 2N708 1901 0025 Diode Si RD1526 1901 0033 Diode Si 1N459A 19459A 1910 0016 Diode Ge CGD1003 1 0565750 Type 220 obd 2100 0076 2100 0355 var comp 75 ohms 10 R var comp 2K ohms 20 See introduction to this section 01290 2 5 7 Section V Model 5262A Table 5 4 obd 9130 0018 Transformer pulse 10 gh PE4502 9140 0146 Inductor fxd 10 uh 1025 44 See introduction to this section 5 8 01290 2 Model 5262A Appendix APPENDIX This manual applies directly to the 5262A Time Interval Units having serial number prefix 516 This manual with the following changes also applies to 5262A Time Interval Units having serial prefix numbers 450 229 and 217 To adapt this manual to instruments with serial number prefixes other than 516 make the following changes Instrument Serial Prefix Change No 450 1 229 217 1 2 CHANGE 1 Tables 5 1 5 4 Change 05262 0001 to 5262A 1A 05262 2002 to 5
12. signals whose phase difference is to be measured to START and STOP inputs Note For specified accuracy do not exceed 40 volts peak times multiplier setting Set start TRIGGER LEVEL control for no dif ference in counter reading as start MULTI PLIER is switched between the 0 1 and 0 2 positions Procedure Model 5262A a Note counter reading with MULTIPLIER set to 0 1 position b Note counter reading with MULTIPLIER set to 0 2 position Subtract the smaller reading from thelarger reading If reading in step b is less than reading in step a add result of step c to reading of step a and adjust TRIGGER LEVEL for result lf reading in step b is greater than reading in step a subtract result of step c from reading of step a and adjust TRIGGER LEVEL for result Note The procedure may have to be repeated to obtain exact zero crossing Repeat step 9 for stop TRIGGER LEVEL con trol Read phase difference in units selected by TIME BASE switch Figure 2 5 Procedure for Phase Measurement 01290 1 x pe CB Mime Model 5262A 10 ELIMINATING DC COMPONENT FROM SINE WAVE INPUT 2 11 As the input circuits of the Model 52624 are dc coupled it is sometimes easier set the MULTIPLIER and TRIGGER LEVEL controls whenany dc component from the s
13. slat 5 9 gt 01290 2 111 Section Figure 1 1 model 5262A 5 gt NIT TIME INTERVAL m 6 5262A gi 2 M m bnc bnc cable 1 ONDE T 1 0 Model 52624 ie 01290 2 Model 5262 AB eT A Coss apio east eec me fim me cae 22 Section I Paragraphs 1 1 to 1 7 SECTION 1 GENERAL INFORMATION 1 1 INTRODUCTION 1 2 CONTENT This manual provides instructions om operation and maintenance of the Model 5262A Time Interval Unit 1 3 SERIAL PREFIX Model 52624 carries five digit serial number with a three digit prefix 000 00000 If the prefix number on the instrument agrees with the prefix number on the title page this manual applies to theinstrumentdirectly If the serial prefixes do not agree change sheets with the manual describe changes which are necessary so that the manual can be used with the instrument 1 4 DESCRIPTION 1 5 Model 52624 shown in figure 1 1 provides Start and stop pulses initiated by electrical inputs to open and close the main gate of the Model 52431 or similar electronic counter enabling it to make time Table 1 1 Range 1 psec to 108 sec Start and stop pulses must be separated by 1 psec to give useful readings Accuracy 1 period of standard frequency cou
14. slide it all the way into the plug in compartment of the Model 5243L and turn the knurled knobs on either side of the compartment clockwise until tight Power is supplied to the Model 5262A from the Model 5243L 2 5 CONTROLS 2 6 FUNCTION SWITCH The function switch pro vides the operator with three modes of operation common separate and remote a With the function switch in the COMMON positioa START and STOP input connectors are connected to gether internally Thus if start and stop signals come from the same source set function switch to COMMON and apply the signal to either input con Adjust MULTIPLIER and TRIGGER LEVEL controls for each channel separately b With the function switch inthe REMOTE position the time interval function becomes one of the remote programming operations of the counter c With the function switch in the SEPARATE po sition the start signal must be applied toSTART input connector and stop signal must be applied to STOP input connector 2 7 TRIGGER SLOPE The TRIGGER SLOPE con trols determine the slope a signal must have as it crosses the voltage level set by the MULTIPLIER and TRIGGER LEVEL controls to start or stop a measurement 2 8 MULTIPLIER AND TRIGGER LEVEL These controls work together to determine the voltage level a signal must cross to start or stop a measurement For example with the TRIGGER LEVEL dial set at 2 and the MULTIPLIER set at 3 the Model 5262A will
15. trigger as the input crosses the 0 6 volt level Suppose you have a pulse as shown in figure 2 1A there will be little difference whether measurement begins at Vg or Vp However to measure interval y of figure 2 1B you must be more careful Set TRIGGER LEVEL dial reading near O0 asa preliminary 01290 2 A SIMPLE SQUARE WAVE B PULSE ON PEDESTAL 10 551 Figure 2 1 Trigger Level Settings adjustment Adjust the start and then the stop TRIG GER LEVEL controls Watch for definite changes in measured time Thus you know that start and stop voltage levels are above the stepandthatthe indicated time interval is actually 2 9 MULTIPLIER AND TRIGGER LEVEL USING OSCILLOSCOPE This is an easier method because you can see where the pulses are occurring with re spect to the signal Connectors at the rear of the 2 1 Section II Paragraph 2 9 cont d VOLTAGE STEP FROM REAR OF 5243L INPUT SIGNAL TO 5262A 22 i Kite cR Eo Rm A Model 5262A TRIGGER LEVEL ON SLOPE TRIGGER LEVEL ON SLOPE LD M 552 Figure 2 2 Oscilloscope Display of Trigger Levels front panel slope control set to neg Mode 5243L Electronic Counter provide separate volt age steps which occur at the same timeas the trigger pulses Use the following procedure a Connect BNC to BNC cable between START in put connector on front panel of Model 5262 and EXT AC SYNC input of oscilloscope use tee con
16. 262 2 CHANGE 2 Figure 4 6 Tables 5 3 5 4 Delete A3CR10 Part No 1910 0016 01290 2 IA 1
17. 5 1 4W CB1635 0683 1805 fxd comp 18 ohms 5 1 4W CB1805 0683 2025 fxd comp 2K ohms 5 1 4W CB2025 0683 2035 fxd comp 20K ohms 5 1 4W CB2035 introduction to this section 5 6 01290 3 5262 Section V Table 5 4 Table 5 4 Replaceable Parts Cont d Description Part No 0683 2215 fxd comp 220 ohms 4595 1 4 W CB2215 0683 2435 R comp 24K ohms 5 1 4 W CB2435 0683 2725 fxd comp 2 7K ohms 35 1 4 W CB2725 0683 3045 fxd comp 300K ohms 5 1 4 W CB3045 0683 3055 CB3055 fxd comp 3M 5 1 4 W fxd comp 330 ohms 5 1 4 W R CB3315 fxd comp 390 ohms 5 1 4 W CB3915 0683 4325 R fxd comp 4 3K ohms 5 1 4 W CB4325 0683 4705 R fxd comp 47 ohms 5 1 4 W CB4705 R 0683 4725 fxd comp 4 7K ohms 5 1 4 W CB4725 0683 5605 CB5605 fxd comp 56 ohms 5 1 4 W R 0683 5615 R fxd comp 560 ohms 5 1 4 W 5615 0683 6215 fxd comp 620 ohms 5 1 4 W CB6215 0683 6815 R fxd comp 680 ohms 5 1 4 W CB6815 R 0683 9135 fxd comp 91K ohms 5 1 4 W CB9135 0686 6815 fxd comp 680 ohms 5 1 2 W EB6815 0686 9135 fxd comp 91K ohms 45 1 2 W EB9135 0757 0122 R fxd mfgl 27 1K ohms 1 1 10 W 0757 0123 0757 0124 fxd mfgl 34 8K ohms 41 1 10
18. IME BASE 0 1 8 FUNCTION to REMOTE or TIME INT b On Model 5262A set start and stop TRIGGER LEVEL controls to 0 On Model 5262 set MULTIPLIERS to 1 TRIG GER SLOPES to opposite polarity and COM REMOTE SET to COMMON d Connect 500 sine wave at 300mv rms to START input e Slowly adjusting TRIGGER LEVEL controls will produce readout on Model 52431 of 1 microsecond 4 17 SENSITIVITY AND RESPONSE CHECK Checks are identical for START and STOP channels a With the exception of step c follow procedure of paragraph 4 15 steps a through h 4 3 Section IV Model 5262A Figure 4 3 Che PSG SSAC EUG 1224 a Seen DT JI ix J2 4 AIR3 A2R5 AIR4 A2RA 164 na A2C4 A2R3 SS A2C3 A2C8 2 2 2 Figure 4 3 Component Location Model 5262 overall 4 4 01290 1 x Model 5262 INPUT SIGNAL 5262A _ Section IV Paragraph 4 18 C POSITIVE STEP ON NEGATIVE SLOPE Figure 4 4 Voltage Step Coincident with Trigger Pulses b Connect START connector at the rear of the Model 5243L to one input channel of the oscilloscope c Connect a sigaal from an oscillator of 300 milli volts to START connector of the Model 5262A and the other input channel of the oscilloscope d Set VERTICAL PRESENTATION of the oscil loscope to CHOPPED e Sweep the range of input frequencies from 1 kc to above 2 mc at a level of 300 milliv
19. R LD M 559 Figure 3 6 Diode Switch Circuit 01290 1 lt A M Model 52624 Section IV Paragraphs 4 1 to 4 9 SECTION IV MAINTENANCE 4 1 INTRODUCTION 4 2 This section contains troubleshooting informa tion and a performance check for the Model 52624 No preventive maintenance is required for the Model 5262 Time Interval Unit except an occasional visual inspection 4 3 TEST EQUIPMENT E 4 4 Test equipment required for troubleshooting for the performance check and for adjustment of the Model 5262 is listed in table 4 1 Equipment of equivalent characteristics may be substituted for those listed 4 5 TROUBLESHOOTING 4 6 A possible troubleshooting procedure follows Remove the Model 5262A from the Model 5243L and reconnect it using the AC 16Y extender cable Table 4 1 Test Equipment Required eee Electronic Counter Model 52431 AC Vacuum Tube VOLTMETER 0 to 300 vac DC Vacuum Tube Voltmeter 0 300 Oscilloscope Dual Channel 2 mc Supply power for unit visualindi cation of operation of unit Voltage Measurements Voltage and resistance measurements General troubleshooting checking out waveforms Oscillator 0 to 2 mc Signal injection check response of 9 Model 650A circuits in unit Test Oscillator b Interchange trigger generator board
20. able 01290 3 4 1 Section IV Paragraphs 4 10 to 4 15 A BASE AND EMITTER OF QI AND Q2 0 3V i eee B EMITTER OF Q4 3V 2 5V C BASE OF Q6 0 6V 6 06 07 0 4 E COLLECTOR 06 2 0 V i 2V F BASE OF Q7 4 OV Q 6V G COLLECTOR 07 2 6V 2 2 INPUT OF CR6 2 2V 2 6V W M I68 Figure 4 1 Waveforms Resulting from Input Sine Wave at Volt Peak to peak 4 2 Model 5262 b Melt solder in holes clean holes with toothpick or wooden splinter not use a metal tool which may damage board c Bend component leads to correct shape and in sert in holes Solder leads in place from opposite side of board d If plating breaks on inside of holes indicated by lifting of conductor pad on opposite side of board press pad against board and solder component lead to conductor on each side of board 4 10 ADJUSTMENTS AFTER REPAIR 4 1 As a general rule unless a transistor or diode is replaced no adjustments will be necessary Para graphs 4 12 and 4 13 indicate adjustments that are necessary if transistors or diodes are replaced 4 12 ZERO SET INPUT If repair is made to start channel proceed as follows With the counter turned off connect Model 5262A by means of the cable AC 16Y b Connect a cable from input of oscilloscope
21. ation Trigger Generator Assembly A3 A4 amplifier the trigger circuit the trigger level con trols and the slope controls are working properly a With the SAMPLE RATE control of the Model 5243L in the POWER OFF position plug the Model 5262 into the compartment turn SAMPLE RATE control slightly clockwise turning it on b Set STORAGE switch at rear of Model 5243L to off c Set COM REMOTE SEP of Model 52624 to SEP d Set MULTIPLIER to 1 e Set TRIGGER LEVEL 100 f Set FUNCTION switch toREMOTE OR TIME g On Model 5243L set TIME BASE switch to 1 ms h Set SIGNAL INPUT switch to PLUG IN i Set start and stop SLOPE controls to j Rotate start TRIGGER LEVEL control from 6 to 6 and back to 6 The Model 5243L will start courting the display will indicate the count and the gate light will glow k Rotate stop TRIGGER LEVEL control from 6 to 6 and back to 6 The Model 5243L will stop counting indicated by gate light going off 01290 2 m Set start and stop SLOPE controls to n start TRIGGER LEVEL control from 6 to 46 and back to 6 The Model 5243L will start counting p stop TRIGGER LEVEL control from 6 to 46 and back toward 6 The Model 5243L will stop counting 4 16 MINIMUM TIME INTERVAL This check shows that the gate binary of the Model 52431 will respond to pulses which are as close as one microsecond a On Model 5243L set T
22. ch Assy 5262A 19A designations prefixed Al or A2 Circuit 9 Stock No 0160 0182 mica 47 pf 5 500 vdew 0160 0181 Fen mica 30 pf 4596 500 0160 0178 mica 27 pf 5 300 0150 0042 fxd TiO 4 7 pf 5 500 fxd TiO 1 pf 10 500 vdew 0150 0029 0140 0203 fxd mica 30 pf 5 500 0160 0183 C fxd mica 130 pf 5 300 vdew 0140 0149 C fxd mica 470 pf 5 300 vdew 0130 0008 C var cer 8 50 pf 0683 1135 fxd comp 11K ohms 5 1 4 W 0683 2035 fxd comp 20K ohms 5 1 4 W 0686 9135 fxd 91K ohms 5 1 2 W 0683 3045 fxd comp 300K ohms 5 1 4 W 0683 1055 fxd comp 1M 45 1 4 W 0683 3055 0683 1065 0686 6815 fxd comp 3M 5 1 4 W fxd comp 10M 5 1 4 W fxd comp 680 ohms 5 1 2 W a Optimum value selected at factory average value shown Table 5 3 Trigger Generator Assy 5262A 65A designations prefixed A3 or A4 No 0160 0127 C fxd cer 1 uf 20 25 vdew 0180 0100 fxd tantalum elect 4 7 uf 10 35 C3 0160 0127 C fxd cer 1 uf 20 25 vdew C4 0140 0202 C fxd mica 15 pf 5 500 vdew C5 0150 0093 C fxd 0 01 uf 80 20 100 C6 0140 0204 fxd mica 47 pf 5 500 7 C7 0140 0151 fxd mica 820 pf 2
23. een leading and trailing edges of a pulse or between consecutive pulses on a single cable figure 1 2 Start stop signals may be initiated by inputs of either positive ornegative polar ity positive or negative slope and at a predetermined voltage Trigger Amplitude Both channels continuously adjustable from 250 volts to 250 volts Frequency Range of 5262A when used as an input signal discriminator 0 to 2 mc Standard Frequency Counted 107 to 1 Cps in decades from 5243L or exter nally applied frequency Markers Separate output voltage steps 0 5 volts peak to peak from source impedance of approximately 7K ohms 100 pf available at rear panel of 5243L with negative step coincident with trigger points oa input waveforms for positive slope and positive Step coincident for negative slope Reads In us ms sec with measurement units indicated and decimal point positioned Accessories Furnished 16 Cable Assembly male BNC to male BNC 48 inches long Net Weight 2 1b Section I Paragraphs 1 8 to 1 15 A PULSES ON ISOLATED CABLES B PULSE DURATION LD S 563 Figure 1 2 Basic Start Stop Signals Figure 1 3 Delay Measurement 1 2 Model 5262A 1 8 DELAY Figure 1 3 shows a circuit arrange ment of measurement of delay for a fixed delay line 1 9 VELOCITY Velocity of an object can be deter mined by measuring the time required for it to pass from one transducer to another 1 10
24. ge TWT traveling wave tube DR drive M milli 1073 P O part of MEG meg 106 POLY polystyrene U micro 10 8 ELECT electrolytic METFLM metal film PORC porcelain ENCAP encapsulated MFR manufacturer POS position s VAR variable EXT external MINAT miniature POT potentiometer VDCW dc working volts MOM momentary PP peak to peak F farads MTG mounting PT point w with FH flat head MY mylar RECT rectifier Ww watts FILH fillister head RF radio frequency WW wirewound FXD fixed N nano 10 9 RH round head without 01194 10 01290 4 Section V Model 5262A Table 5 1 Table 5 1 Components Located on Chassis No Prefix Circuit 2 BRE 5262 19 Switch attenuator 5262A 65A Assy trigger generator 0150 0093 fxd cer 0 01 pf 80 20 100 1250 0083 Connector female type UG 1094 U 1251 0099 Connector male 50 pin 2100 0076 var comp 75 ohms 10 3100 0338 Switch rot 2 sect 3 pos Not assigned 1251 0135 Connector 15 pin for po MISCELLANEOUS 0370 0076 Knob TRIGGER LEVEL 0370 0077 Knob FUNCTION 0370 0102 Knob TRIGGER SLOPE 0370 0110 Knob MULTIPLIER 5262A 40A Knob skirt TRIGGER LEVEL 5262A 40B Knob skirt MULTIPLIER 05262 0001 Board Mounting Bracket 05262 2002 Panel Front See introduction to this section 5 2 01290 2 Model 5262A Section V Table 5 2 through Table 5 3 Table 5 2 Attenuator Swit
25. ively 1 gone sufficiently positiveto cause Q6toturn on 2 increased to its maximum and then 3 de creased from maximum to the point where its voltage level is equal to that which is necessary to turn Q6 on This would be the point where Q6 might be expected to turn off but now its emitter is at a lower positive potential so Q6 now requires a lower positive voltage on its base to suppress the electron flow from its emitter and effectively turn it off Therefore the delay in the turn off of Q6 caused by its lower emitter bias results in a slight increase length of the square wave output of Q7 3 11 SHORT PULSES An input signal will cause a voltage step to appear at the collector of Q7 either positive or negative depending upon the slope of the input signal Transformer 1 forms these voltage steps into short pulses and inverts them 3 12 TRIGGER SLOPE The block diagram figure 3 1 shows this control symbolically as a switch Diode switching places the useful NEGATIVE start or stop trigger pulse on the proper slope Figure 3 6 shows the diode switch circuit Forward biasing either CR6 for negative slope or CR7 for positive slope provides trigger pulse for the desired slope TRIGGER SLOPE control on the front panel switches the bias from one diode to the other 3 2 ue ed 2 DEM Model 5262 HYSTERESIS LIMITS Figure 3 5 Trigger Circuit Operation START OR STOP SIGNAL TO COUNTE
26. limits reaches 01 3 6 FEEDBACK AMPLIFIER AND TRIGGER LEVEL Figure 3 4 shows the circuit with the feedback path Q2 and Q3 form a feedback amplifier which provides a very stable gain over a wide band of frequencies Q2 functions as a differential amplifier amplifying the difference between the input voltage appearing at its base and the feedback voltage appearing at its emitter SIGNAL INPUT BIAS LEVEL 3 7 feedback circuit also includes the TRIGGER LEVEL control R1 Varying the dc bias of Q2 con trols the trigger level This effectively shifts the signal with respect to the hysteresis limits of the trig ger circuit thereby controlling the levels at which the Model 52624 triggers Figure 3 4 Feedback Amplifier Circuit SIGNAL OUTPUT TO BASE FIXED DC BIAS CURRENTS BIAS LEVEL Figure 3 3 01290 1 LO M 556 Amplitude Limiter Operation Section III Paragraphs 3 8 to 3 12 3 8 SCHMITT TRIGGER The trigger circuit is a special form of switching circuit bi stable multi vibrator which produces fast rising signals Figure 3 5 shows the trigger circuit with input and output waveforms lf initially the input signal becomes more positive it will eventually reach a predetermined level point a in figure 3 5 at which the circuit changes state turns on and Q7 turns off If the input signal then goes negative the emitter potential decreases and Q7 base goes positive When the inpu
27. nector UG 274A U at Model 52624 b Connect the START output connector at the rear of the Model 5243L and one input channel of the oscil loscope Set Model 5262A function switch to COM INPUT CIRCUIT 5262 BLOCKING CAPACITOR Cg SOURCE IMPEDANCE Rs SIGNAL SOURCE MULT d Connect a cable from an oscillator to theSTART input connector of the Model 52624 frequency is not important if it is a sine waveandthe range is between 0 and 2 mc d e Connect the STOP input connector of the 5262A and the other channel of the oscilloscope f VERTICAL SENSITIVITY controls volts cm to 2 g Set the VERTICAL PRESENTATION selector of the oscilloscope to CHOPPED or ALTERNATE h Display on the oscilloscope will be similar to that shown in figure 2 2 IPLIER SETTING 0 1 0 2 0 3 3 10 30 100 ar as foe om on n 0 555 Figure 2 3 Remove DC Component from Sine Wave Input 2 2 01290 1 up Model 5262 Section Figure 2 4 5 1086 1 Turn SAMPLE RATE control to POWER OFF 8 Set SAMPLE RATE control for desired oper ating rate 2 Plug in Model 52624 turning knurled knobs clockwise until tight 9 Set start channel SLOPE control to if you 3 Set SENSITIVITY switch to PLUG IN want measurement to start on positive slope Set to if you want tostart count on negative 4 Set FUNCTION switch to REMOTE OR TIME slope INT
28. nted time base accuracy Registration On 5243L counter Input Voltage 0 3 volt peak to peak minimum direct coupled input Input Impedance 10K ohms less than 89 pf on X 1 and X 2 mul tiplier positions constant up to 40 volts peak times multiplier position 100K ohms times multiplier position on X 3 to X100 positions less than 40 pf on X 3 and less than 20 pf on to X100 constant up to 40 volts times multiplier position Overload 50 volts rms or 150 volts peak on X 1 2 and 3 multiplier positions is tolerable 150 volts rms Or 250 volts peak on X1 and X3 250 volts rms or 250 volts peak on X10 30 and 100 Start Stop Independent or common channels Trigger Slope Positive or negative on Start and Stop channels independently selected 01290 3 Specifications interval measurements Time intervals from 1 micro second to 108 seconds are measured with a resolution of 0 1 microsecond using frequencies available in the Model 52431 or external frequencies of 20mc or less When the counter counts a signal derived from its crystal oscillator counter time base accuracy is re tained Specifications are given in table 1 1 The Model 5262A has two independent channels each with its own controls A function switch permits selection of three modes of operation 1 6 APPLICATIONS 1 7 DIRECT ELECTRICAL MEASUREMENTS Basic time interval measurements can be made between pulses on isolated cables betw
29. olts f Over this range voltage steps coincident with trigger pulses similar to those shown in figure 4 4 will appear g Repeat steps a through f for STOP channel of Model 5262A 4 18 ATTENUATOR MULTIPLIER AND TRIGGER LEVEL CHECK a Connect negative output square wave generator 600 Q output of Model 211A to START input of the Model 5262A and to one of the channels of the oscillo scope so as to show the input signal level 01290 2 b Set square wave generator to approximately 10 kc at about 300 millivolts peak c Set start MULTIPLIER to 0 1 position d Set start TRIGGER LEVEL to 0 e Rotate start TRIGGER LEVEL control slowly until gate light of Model 5243L goes on f The TRIGGER LEVEL dial calibration should indicate 1 5 within plus or minus one division g Change setting of MULTIPLIER control to 2 and repeat step e h Increase signal level of square wave generator to 600 millivolts peak i The TRIGGER LEVEL dial calibration should indicate 1 5 within plus or minus one divisioa j Repeat for all MULTIPLIER control settings Increase output of square wave generator andincrease MULTIPLIER steps and note that the attenuation in serted by the MULTIPLIER switch agrees with the change in square wave level 4 5 Section IV Figure 4 5 PLUG IN ENABLING 15V A3 TRIGGER GENERATOR ASSEMBLY ESR __ 11 SWITCH ASSEMBLY PLUG IN ON SIG START
30. rmer Y crystal ABBREVIATIONS amperes germanium N C normally closed RMO rack mount only A F C automatic frequency control GL glass NE neon RMS root mean square AMPL amplifier GRD ground ed NIPL nickel plate N O normally open S B slow blow B F O beat frequency oscillator H henries NPO negative positive zero SCR screw BE CU beryllium copper HEX hexagonal zero temperature SE selenium BH binder head HG mercury coefficient SECT section s BP bandpass HR hour s NRFR not recommended for SEMICON semiconductor BRS brass field replacement 51 silicon BWO backward wave oscillator IF intermediate freq NSR not separately SIL silver IMPG impregnated replaceable SL Slide CCW counter clockwise INCD incandescent SPL special CER ceramic INCL include s OBD order by description SST stainless steel CMO cabinet mount only INS insulation ed OH oval head SR split ring COEF coefficient INT internal Ox oxide STL steel COM common COMP composition K kilo 1000 peak tantalum CONN connector PC printed circuit TD time delay CP cadmium plate LIN linear taper PF picofarads TGL toggle CRT cathode ray tube LK WASH lock washer 10 12 farads d TI titanium CW clockwise LOG logarithmic taper PH BRZ phosphor bronze TOL tolerance LPF low pass filter PHL Phillips TRIM trimmer DEPC deposited carbon PIV peak inverse volta
31. s a Cover panel with soft wrapping paper b Wrap corrugated cardboard completely around instrument c Pack instrument securely in strong corrugated container 350 b square inch bursting test d Insert filler between wrapped instrument and container to insure a snug fit on all surfaces of the instrument 1 15 ENVIRONMENT Conditions during storage shipment should normally be limited as follows Maximum altitude 20 000 feet b Minimum temperature 40 F 409C c Maximum temperature 167 F 75 C 01290 3 usa or il a rs ib a a RE au Ka D Ge a COR S atin CS RE AR ae cn Rohan dud A a Rt dos roe serie tS cios Fesser ui HY Y Model 5262A Section II Paragraphs 2 1 to 2 9 SECTION X OPERATING INSTRUCTIONS 2 1 INTRODUCTION 2 2 Model 52624 has two independent channels which determine the beginning and the end of a time interval Each channel has its own TRIGGER SLOPE TRIGGER LEVEL and MULTIPLIER controls Fig ures 2 4 and 2 5 show procedures for making a time interval measurement and a phase measurement The following paragraphs describe installation of the Model 52624 and the function of each control 2 3 INSTALLATION 2 4 Installing the Model 5262A is a simple matter Just
32. s 5 1 thru 5 3 list parts in alpha numerical order of their reference designations and indicate the description and stock number of each part together with any applicable notes Table 5 4 lists parts in alpha numerical order of their stock number and provides the following information on each part a Description of the part see list of abbreviations below b Typical manufacturer of the part in a five digit code see list of manufacturers in Table 5 5 c Manufacturer s part number d Total quantity used in the instrument TQ column 5 3 Miscellaneous parts are listed at the end of Table 5 1 5 4 ORDERING INFORMATION 5 5 obtain replacement parts address order or inquiry to your local Hewlett Packard Field Office see list at rear of this manual for addresses Identify parts by their Hewlett Packard stock numbers 5 6 obtain a part that is not listed include a Instrument model number b Instrument serial number c Description of the part d Function and location of the part REFERENCE DESIGNATORS A assembly E misc electronic part MP mechanical part TB terminal board B motor F fuse P plug TP test point C capacitor FL filter Q transistor vacuum tube neon CP coupling R resistor bulb photocell etc CR diode K relay RT thermistor cable DL delay line L inductor 5 switch socket DS device signaling lamp M meter T transfo
33. s the reference point for two reasons first it is the easiest point to determine accurately on the counter and second for sinewaves it is in the region of maximum slope allowing maximum resolution 2 16 Phase difference is measured in time units if one of the internal standard frequencies is counted The following formula converts time interval t to phase in degrees 360t period of either signal 2 17 the two signals are not equal in amplitude use the larger for the period measurement You can measure phase directly in degrees if you apply the appropriate external frequency 360 x frequency of signals whose phase you are measuring to the counters in place of an interna standard frequency However the external frequency cannot exceed the maximum counting rate of the instrument Procedure for phase measurement is given in figure 2 5 2 5 RR RE TT ITE Section Model 5262A Figures 3 1 and 3 2 TRIGGER GENERATOR tj START AMPLIFIER ATTENUATOR AND TRIGGER COUNTER STOP PULSE ATTENUATOR TO TRIGGER COUNTER LD M 554 Figure 3 1 Overall Block Diagram of Model 5262A EMITTER FB EMITTER FOLLOWER AMPLIFIER FOLLOWER LIMITER LIMITER INPUT CRI CR2 CR4 CR5 TRIGGER 2 LEVEL CONTROL EMITTER 15v FOLLOWER DIODE SWITCH INVERTER S CIRCUIT PULSE STOP XFMR PULSE Q6 Q7 Ti TO
34. s to isolate trouble in a faulty channel to its board The start and stop channels of the Model 5262A are independent and trouble in one generally will not affect the other c Refer to waveform chart component location drawing and schematic diagrams figures 4 1 through 4 6 for guidance d Apply a sine wave to input of Model 52624 and check points listed with waveforms in figure 4 1 4 7 transistor is the component most likely to be at fault For example a short between the col lector and the emitter isolates the base from all fol lowing circuits and the applied signal would be blocked at the base Another likely fault is either a shorted open diode 4 8 SERVICING PRINTED CIRCUIT BOARDS 4 9 prevent damage to the board when replacing components apply heat sparingly and work carefully The following replacement technique is recommended a Remove defective component Model 5243L Electronic Counter Model 400D H L AC Vacuum Tube Voltmeter Model 412A DC Vacuum Tube Voltmeter 62 Model 150A Oscil loscope with 1528 Plug In or Model 160B with 162A Plug In or Model 170A with 162A Plug In Square Wave 10 cps to Signal injection check response of Model 211A Generator 100 ke circuits in unit Square Wave Generator Test Cable Allows unit to be operated outside 10506 AC 16Y of the counter Extender c
35. t e 2 5 5 1 Introduction 9 1 2 14 Phase Measurement 2 5 9 4 Ordering Information 9 1 APPENDIX LIST OF ILLUSTRATIONS Number Title Page Number Title Page 1 1 Model 5262A Interval Unit 1 0 3 3 Amplitude Limiter Operation e 3 1 1 2 Basic Start Stop Signals 1 2 3 4 Feedback Amplifier Circuit 3 1 1 3 Delay Measurement 1 2 3 5 Trigger Circuit Operation 2 3 2 3 6 Diode Switch Circuit 3 2 2 1 Trigger Level Settings 4 2 1 T gt 2 2 Oscilloscope Display of Trigger Levels 4h i Sine 4 2 front panel slope controls set to neg 2 2 4 2 Combien ec um det rator 2 3 Removing DC Component from Sine T embly A3 A 4 igger Gen 4 3 Wave Input 4 2 2 E t 2 4 Operating the Model 5262A 2 3 js VoM P 21 5262A 4 4 2 75 Procedure for Phase Measurement 2 4 Pulse pone am 4 5 4 5 Overall Functional Diagram 3 1 Overall Block Diagram of Model 5262A 3 0 schematic M 4 6 3 2 Block Diagram of Model 5262A Trigger 4 6 Switch and Trigger Generator Generator Assembly 3 0 schematic s 4 7 LIST OF TABLES Number Title Page 1 1 Specifications 1 1 4 1 Test Equipment 4 1 5 1 Components Located on Chassis No Prefix 5 2 Attenuator Switch Assy 5262A 19 designations prefixed A1 or A2 5 3 5 3 Trigger Generator Assy 5262A 65A designations prefixed A3 or A4 5 3 5 4 Replaceable Parts oiv 5 6 5 5 Manufacturer s Code oa eve
36. t reaches a second predetermined level point b in fig ure 3 5 Q7 turns on and the circuit switches back to its initial state output of the circuit is a current Step either positive or negative depending upon the slope of the input Transformer inverts and differentiates these current steps 3 9 HYSTERESIS LIMITS trigger circuit switches at certain input signal levels Notice that the circuit does not switch unless the input signal crosses both limits alternately However as shown in figure 3 5 the trailing edge of occurs ata lower input voltage level than that which causes the leading edge The reason for this is as follows The alternate off and on states of Q7 yields high and low outputs respectively These off and on states of Q7 are caused by the on and off states of Q6 When Q6 is off Q7 turns on and produces alow output Current flow through R26 due to the conduction of Q7 biases the emitters of both Q6 and Q7 positively with respect to ground This positive bias at the emitter of Q6 necessitates a positive signal of certain amplitude on the base of Q6 before Q6 will turn on and thereby turn off Q7 When Q7 turns off the current will then flow through Q6 and R26 Since R23 is in the collector circuit of Q6 the voltage drop across R26is less than when Q7 was on Consequently the positive bias on the emitters is now less than when was off 3 10 In the meantime the input signal has progres s
37. tart and or stop sine wave input signals is eliminated with blocking capacitors With the aid of figure 2 3 you can select the proper value of blocking capacitor for no readout error For example on the MULTIPLIER range at 400 cps with a source impedance of 10 000 ohms the proper value of blocking capacitor is 25 pf 2 12 However if the right value of capacitor is not available use the following approximate formula to determine what the error per channel in seconds will be for phase shifts less than 109 and signalsless than 40 volts peak times multiplier positioa R RC zi 5 Error in seconds See Cs R R 27f Cs Blocking capacitor Signal source impedance RC 6x 10 for 0 Land 0 2 MULTIPLIER settings 9 x 107 for0 3 1 5 x 1079 3 3 x 10 3 1 x 10 10 3 x 10 for 30 1 x 10 100 for 1 01290 1 Section II Paragraphs 2 10 to 2 17 2 13 For example on the 1 MULTIPLIER range the use of a 10 uf blocking capacitor at 400 cps and with a source impedance of 600 ohms results in an error of 1 5 microseconds 2 14 PHASE MEASUREMENT 2 15 Phase measurement is a special application of time interval measurement You measure the time interval between like points on twosimilar waveforms and relate the reading to phase angle The measure ment is made between the points where the signals cross 0 volt going in the same direction The zero crossing i
38. to START input of Model 5262A Set oscilloscope ver tical sensitivity to 05 v cm c On Model 5262A set both TRIGGER LEVEL controls to 0 both MULTIPLIER controls to 100 and the COM REMOTE SEP switch to d On the START channel circuit board 5262 65A adjust R6 for zero volts plus or minus 10 milli volts measured between center terminal of START connector and chassis ground e Repeat steps a through d for STOP channel if repair is made in the STOP channel board 4 13 ATTENUATOR MULTIPLIER repair is made to START channel proceed as follows a Connect square wave generator use 75 ohm output of Model 211A output to START input of Model 52624 b Set square wave generator for anoutput of 100 kc at a 300 millivolt peak level Model 211A generates only negative pulses c Set start MULTIPLIER switch to 2 and adjust C9 on input MULTIPLIER switch so that same shape Square wave is seen at emitter of Q4 as when MULTI PLIER switch is in 1 position square wave ampli tude will decrease by two d Repeat steps a through c for STOP channel if repair is made in the STOP channel board 4 14 IN CABINET PERFORMANCE CHECK 4 15 PRELIMINARY CHECK Steps a through p of the following procedure confirm that the feedback 01290 1 w Model 5262A Section IV Paragraphs 4 16 to 4 17 98 96 Ge el EO BERBER CER 05262 A 5 Figure 4 2 Component Loc

HP5262A Manual

Contents

Download Pdf Manuals

Related Search

Related Contents