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HP 3455A, Operating And Service Manual

The HP 3455A is a high-performance electronic voltmeter renowned for its accuracy and reliability. To fully utilize its features, we offer a comprehensive Operating and Service Manual for users to download, free of charge, from our website. Harness the power of this exceptional device with our user-friendly manual.

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Summary of Contents for 3455A

Page 1: ...OPERATING AND SERVICE MANUAL DIGITAL VOLTMETER 3455A HEWLETT PACKARD hp 3455A ...

Page 2: ...ual adapts it to earlier instruments Where practical backdating Information Is Integrated into the text parts list and schematic diagrams Backdating changes are denoted by a delta sign An open delta A or lettered delta A on a given page refers to the corresponding backdating note on that page Backdating changes not integrated into the manual are denoted by a numbered delta At I which refers to the...

Page 3: ... to hp from another country Hewlett Packard 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 Hewlett Packard 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 a...

Page 4: ...d Device Status Messages 3 12 3 82 Data Output Characteristic 3 13 3 84 Bail Out Message 3 13 3 86 Instrument Measurement Times Remote Control 3 13 3 88 Remote Programming Examples 3 14 3 90 Operators Checks 3 14 3 92 Bench Use 3 14 3 94 HP IB Operation 3 14 Section Page IV PERFORMANCE TESTS 4 1 4 1 Introduction 4 1 4 3 Equipment Required 4 1 4 5 Performance Test Card 4 1 4 7 Calibration Cycle 4 1...

Page 5: ...8 116 General 8 22 8 118 Circuit Description 8 23 8 141 HP IB Circuit 8 29 8 142 General 8 29 8 144 Circuit Description 8 29 8 168 Front Panel Operation 8 32 8 169 Circuit Description 8 32 TROUBLESHOOTING 8 174 Introduction 8 35 8 176 General Block Diagram Theory of Operation 8 35 8 179 Outguard Section 8 35 8 185 Inguard Section 8 36 8 194 Preliminary Troubleshooting Check 8 36 8 195 Instrument H...

Page 6: ...bleshooting 8 73 8 F 5 Front Panel Operation Check 8 73 8 F 6 Front Panel Servicing Schematic 10 8 74 8 F 7 Front Panel LED s Switch and Key Cap Replacement Procedure 8 74 8 F 8 HP IB Troubleshooting Schematic 9 8 75 SERVICE GROUP 6 8 G l Miscellaneous Troubleshooting 8 76 8 G 2 Power Supplies Schematic 11 8 76 8 G 3 Reference Assembly Schematic 5 8 76 8 G 4 Turn Over Errors Schematic 1 5 and 6 8 ...

Page 7: ... 4 18 4 7 AC Common Mode Rejection Test 4 18 5 1 100 Volt Zero Adjustment 5 1 5 2 1 Volt Zero Adjustment 5 2 8 1 Function Block Diagram 8 1 8 2 Simplified Input Switching Diagram 8 2 8 3 Operational Attenuator Diagram 8 3 8 4 Basic Voltmeter Diagram 8 3 8 5 Simplified Auto Cal Switching Schematic 8 3 8 6 10 V dc Input Offset Error measurement 8 4 8 7 1 V dc Input Offset Error Measurement 8 4 8 8 1...

Page 8: ...Cal Circuitry TEST 4 8 101 8 102 8 H 13 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 3 8 H 14 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 2 8 I05 8 I06 8 H 15 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 1 8 107 8 108 8 H I6 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 0 8 109 8 110 8 H 17 Inguard Troubleshooting ...

Page 9: ...le gases or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified maintenance personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exis...

Page 10: ...nal marked with this symbol must be connected to ground in the manner described in the installation opierating manual and before operating the equipment Frame or chassis terminal A connection to the frame chassis of the equipment which normally includes all exposed metal struc tures Alternating current power line Direct current power line Alternating or direct current power line WARNING 1 t 1 t ca...

Page 11: ...f the dc voltage and resistance functions The reference module can be removed calibrated and returned to the instrument or the module can be replaced with another recently calibrated reference A MATH feature permits voltage or resistance measurements to be scaled into convenient units or to be read directly in percent error from a selected reference The 34S5A is HP IB programmable for system appli...

Page 12: ...015 of reading 0 1 digtls X 100 lOOOV range 0 0003 of reading 0 1 digiis X Accaracy I digil 0 24 hours 23X IX lOV range 100 lOOOV range IV range 90 days 23X 5X lOV rartge 0019 of range 0 002 of reading 3 digits r 0 004 of reading f 3 digits 0 003 of reading 4 digits luv rartge 0 005 of readirtg 3 digits 100 lOOOV range 0 007 of reading t 3 digits IV range 0 006 of reading 4 digits 6 months 2yc 5X ...

Page 13: ...4 digits lOOOkfl range 0 015 of reading 4 6 digits lO OOOkn range 0 100 of reading 4 6 di Performance High Resolution On Taaparatar CoafflctaBt OX to SOX I 10 and llX kn range 0 0003 of reading 4 0 2 digiti X lOOOkn range 0 0005 of reading 4 0 2 diglt X lO OOOkn range 0 004 of readirtg 4 0 2 digils X Accaracy 4 wire k ohms 1 digit 0001 of range 24 hours 23X 1X Ikn range 0 0025 of reading 4 4 digit...

Page 14: ... 30 2 2 350 dig 35 5 1 600 dig 60 5 3 700 dig 70 6 3 3S00dlg 3 5 6 6 3900dig 3 9 MUSI be loMPoetf Su b MtbiabBiis aav sisty k npiA kveb aaow t A e r M eaupMMwb I of hJ kb 0 M kboa WMC lebb ewr a S sfktfwbv kM l7n Bkb0w 4i M b 2 lue AC K 9U if6 m wik CsMl Factor 7 1 al full scale Input Characteristics lapat iBpadaaca Front Terminals 2M0 1 shunted by less than l X pF Rear Termiisals 2MH 1 shunted by...

Page 15: ... dig 06 0 1 30 dig 03 0 75 70 dig 07 1 yt i 2S C S C 0 50 70 dig 07 0 40 70 dig 07 0 12 i 35 dig 035 0 75 80 dig 08 Caart PHa retpurud M Ob IOOOV 401 9 ydr kH Fsigapmias yaaPM i un lOQbHa an I and KM s gAfw MesfKv R nRi d d d fV ndwri 14 Input Characteristics lapat iHpadaaca Front Terminals 2Mfl l shunted by less than lOOpF Rear Terminals 2MO l shunted by less than 75pF Maalaaa lapat Voltaga High ...

Page 16: ...lHMM Noabor Entered or Displayed 199 999 9 Acctarscyt ACCURACY OF X READING 1 DIGIT OF DIS PLAYED ANSWER This assumes no Y error Table 1 2 Typical Operating Characteristics Range SMactton Manuel Auiomalic or Ramota Function Salaetlon DC Volti AC Voltl ACV or FAST ACVJ OHMS 2 wira kllohm or 4 wire kilohm TEST NORMAL MODE REJECTION 50 Ht ORERATION NORMAL MODE REJECTION 60 HI OPERATION Efiective NoIk...

Page 17: ...d Irtdication OL Operstiny Temperature OCtoSOC Warmup Time One hour to meet all specifications Humidity Range 95 R H 0 C t 40 C Storage Temperature 40 Ciot75 C Power 100 120 240 V 5 10 48 Hz to 400 Hz line operation 60 VA 220 V 1 10 48 Hz to 400 Hz line operation 60 VA Dimensions 88 9 mm high x 425 5 mm wide x 527 1 mm deep high x 16 wide x 20 deep Weights Net 9 kg 21 lbs Shipping 12 kg 26 tbs 1 2...

Page 18: ...PA DC Transfer Standard Output Voltages 1 V 1 018 V 1 019V 10 V Accuracy t 5 ppm Stability t 001 30 daysl Fluke Model 731A DC Transfer Starrdard PA Electronic Counter 50 Hz to 60 Hz hp Model S300A S302A Measuring System P ResKtance Standard Resistance 1 kfl Accuracy 0005 Resistance 100 K Accuracy 002 Guildine Model 9330 1 K or 9330A 1 K Guildline Model 9330 100 f A Bus System Analyzer HP IB Contro...

Page 19: ...minal FUSE 100 volts 90 to 105 volts 0 5 A 120 volts 10B to 126 volts 0 5 A 220 volts 198 to 231 volts 0 25 A 240 volts 216 to 252 volts 0 25 A Figure 2 1 Line Voltage Selection used for hp power cables The hp part number directly below each drawing is the part number for a power cable equipped with a connector of that configuration If the appropriate power cable is not included with the instru me...

Page 20: ...nterface bus however the maxi mum length of cable that can be used to connect a group of instruments must not exceed 2 meters 6 S ft times the number of instruments to be connected or 20 meters 65 6 ft whichever is less 2 20 Address Selection The HP IB address switch located on the rear panel permits the user to set the talk and listen address of the instrument The talk and listen address is a 7 b...

Page 21: ...r and full serial num ber of the instrument In any correspondence identify the instrument by model number and full serial number If you have any questions contact your nearest hp Sales and Service Office 2 31 The following is a general guide for repackaging the instrument for shipment If the original container is avail able place the instrument in he container with appropriate packing material and...

Page 22: ...ch allows the Auto Cal feature to be turn ed on or off LEO in center of Key indicates Auto Cal on Refer to Paragraph 3 29 Data Ready Request Indicator lights when the Data Ready Request feature is programmed on Refer to Paragraph 3 65 High Resolution switch switches display from 5 1 2 digit presentation to 6 1 2 digit presentation An LED located in the center of the key indicates High Resoiu tion ...

Page 23: ...output 9 998 or 10 002 etc If any auto cal constants fail the 3455A will not output any readings times out NOTE 3 7 The internal test function of the 3455A verifies the The self test feature does not test operation operation of the dc analog circuitry inguard and of the ohms or ac sections nor the measure outguard logic circuitry and the front panel indicators ment accuracy of the 34S5A and displa...

Page 24: ...dance of both convertors is 2 megohms in parallel with 75 pF for rear terminal input and 90 pF for front terminal input In addition to the normal ac volts func tion the 3455A also has a fast ac volts function The fast ac function has a faster ac reading rate than the nor mal ac function 3 16 The frequency response of the true RMS conver tor is from 30 Hz to 1 MHz in the normal ac volts func tion a...

Page 25: ...nce of I kilohm at 25 C and changes 5900 ppm C At 0 C the sensor would have a resistance of 852 S ohm 1 kilohm 5 9 ohms 25 This number is divided by 1000 since the 34S5A measurement results are expressed in kilohm and is entered in the z register to remove the offset at 0 C The measurement result of he 34S5A is scaled to read directly in degrees centigrade by solving the equa tion for the value of...

Page 26: ...e following is an example of how to use this math technique In this example a DC voltage is measured and compared with a Lower Limit of 10 volts and an Upper Limit of 30 volts y B Upper Limit Lower _ 30 10 _ qqq 5 400 000 400 000 _ Upper Limit Lower Limit _ 30 10 b 20 2 2 By entering 00005 into the y register and 20 into the z register and then pushing the SCALE and DCV buttons the 3455A becomes a...

Page 27: ...riggered again for a new reading If the instrument is triggered while making a measurement the new trigger is delayed After the first measurement cycle is completed the delayed trigger will iniate a second measurement cycle Only one trigger will be delayed during any given measurement cycle Any ex tra triggers sent during this cycle will be ignored c Hold Manual Trigger This trigger is similar to ...

Page 28: ...ints the downrange points and the accuracy of the instrument should be kept in mind when making a measurement Time varient inputs may cause the 345SA to constantly uprange and downrange If this happens manually set the instrument to the higher range 3 40 Measurement time may also change when the in strument is in the Auto Range mode If the instrument is not on the optimum range a reading is taken ...

Page 29: ...l addressed to listen L4 Listener basic listener unaddress to listen if addressed to talk SRI Service Reauesi Capability RLl Remote Local Capability PRO No Parallel Poll Capability DC1 Device Clear Capability DTI Device Trigger Capability CO No Controller Capability El Open Collector Bus Drivers Interface Functions provide the means for a device to receive process and send messages over the bus 3 ...

Page 30: ...vice required Status Bit A single bit of device dependent status information which may be logically combined with status bn information from other devices by the controller Passing Control Pass Control Passes bus controller responsibili ties from the current controller to a device which can assume the Bus sutwrvisory role Bail Out Abort Unconditionally terminates Bus communications and returns con...

Page 31: ...rlined character in the control heading B 3 81 Data Maataget 3 62 The major portion of communications transmit ted over the Bus is accomplished by data messages Data messages are used by the controller to program the Model 34SSA and are used by the 34SSA to transmit measurement data These functions are explained in the following paragraphs 3 83 Programming The 345SA is programmed by means of data ...

Page 32: ... the 3455A display to the Y talk and the 345SA register to listen 3 85 Data Raady Raquaat The DATA READY Request feature permits the 34S5A to signal the controller upon the completion of a measurement This feature would normally be used where the 3455A is triggered from an external source In this mode of operation the 34SSA is programmed to the appropriate measurement parameters FUNCTION RANGE etc...

Page 33: ...IRE kO 2 WIRE kO FAST ACV ACV OCV IFUNCTIONI To Frogrem 1 Profxm Cod ASCII CHAR DECIMAL CODE TEST _ 05 4 WIRE kfl 47 3 WIRE ktl 7 56 FAST ACV S0 ACV 61 DCV 63 3455A To read control status wrt 722 B Address the 3455AIO listen Set the 345 SA to he BINARY PROGRAM mode Since normally four data bytes are used in Binary pro gramming the 345SA may indicate an SRQ condition when only a B is sent red 722 A...

Page 34: ...dicator located above the display is lit During remote operation the front panel controls cannot be operated manually 3 7S Local Message The local message returns the 3455A to LOCAL manual control The 3455A can also be returned to local control by pressing the front panel LOCAL button Some circuits of the instrument may also be in local operation when a local message is send to another instrument ...

Page 35: ...the output handshaking begins Thus a new trigger will indicate a measurement and the new reading will replace the old reading The old reading is lost and there is no SRQ condition b Once the Hrst character of measurement data has been handshaken out the buffer is considered busy un til one of the following occurs 1 The balance of the reading is handshaken out 2 Device or Selected Device clear is g...

Page 36: ...t 3 89 Appendix A at the end of this manual has Remote Programming examples for the 34SSA These examples are given in the HP Basic hp Model 9830A B Con 3 80 OPERATORS CHECKS 3 91 The TEST feature provides a convenient method of testing the basic operational capabilities of the Model 34SSA This test plus an operational check of the Ohms and AC functions tests the major portion of the 34SSA circuitr...

Page 37: ......

Page 38: ...the rear panel AC AC DC switch must be in the ac position Other control settings are included in the test procedures 4 11 PERFORMANCE TEST FAILURE 4 12 If the 3453A fails any of the performance tests or operational verification test perform the adjustments outlined in Section V If the problem cannot be cor rected by the adjustment refer to Section VIII for troubleshooting information 4 13 SPECIFIC...

Page 39: ...e specified accuracy is 0 001 of setting and with the standard set to t 1 00000 V the DVM reads 0 99992 V which is 0 008 low The dc standard s specified accuracy is ten times better than the specification being tested and at 1 V its maximum error contribution to the DVM reading is 10 microvolt or 0 001 If the standard is 0 001 low the actual DVM error is 0 007 if it is 0 001 high the actual DVM er...

Page 40: ...st be calibrated to a 1 017 V to 1 019 V standard cel that has been calibrated by the National Bureau of Standards NBS If the 345SA is to be tested for its 24 hour accuracy specifications the Transfer Standard must be adjusted for optimum 1 volt and 10 volt output accuracy using NBS calibrated stan dards It is recommended that the Transfer Standard be calibrated and adjusted just prior to use Afte...

Page 41: ...in Figure 4 2 Set the Reference Divider s Output Voltage switch to 1000 V o Set the 34SSA controls as follows FUNCTION DCV RANGE 1 kV HIGH RESOLUTION ON GUARD ON CAUTIONj The dc standard s output should be turned on and the voltage adjusted by upranging or downranging the standard whenever the standard s output needs to be changed If a 345SA input voltage greater than 100 V is needed the following...

Page 42: ...e 34SSA reading should be within the Test Limits given in the table Be sure to maintain null when the Reference Divider s output is changed ynrvmmrrrrv CAUTION4 In the following tests for negative readings the input to the 3455A must not exceed 500 V dc due to the 500 V guard to chassis limitation w Downrange the dc standard to 1 V output and turn off the dc standard s output Reverse the polarity ...

Page 43: ...45A 0 1 error range c Connect the output of the AC Calibrator to the 3455A front panel INPUT d 1 Standard Model 34S5A The 3455A 1 V 30 Hz reading should be within the Test Limits listed in Table 4 4 2 3455A Option 001 The 3455A 1 V 30 Hz ACV reading should be within the Test Limits listed in Table 4 6 e 1 Standard Model 34SSA Using the AC Calibrator verify the 34SSA ac voltmeter ac curacy for each...

Page 44: ... n Disconnect the AC Calibrator from the 34SSA Set the 3455A FUNCTION to ACV and RANGE to 1 V 0 Set the Test Oscillator for an output of 1 V 10 kHz Connect the SO ohm output of the Test Oscillator terminated in a 50 ohm load to the 34SSA front panel INPUT p Adjust the Test Oscillator level controls for a 3455A reading as close as possible to the reading record ed in Step i Set the Test Oscillator ...

Page 45: ...est Oscillator and use the level controls to maintain this reading whenever the frequency is varied u I Standard Model 3455A Set the Test Oscillator to each of the last two Test Frequencies listed in Table 4 5 maintain reference level on meter of Test Oscillator At each frequency setting he 3455A reading should be within the Test Limits given in the table 2 345SA Option 001 Set the Test Oscillator...

Page 46: ...rection factor to the 345SA reading The algebraic sum should be within the Test Limits given in Table 4 8 A verify ing the 3455A 4 wire ohms accuracy with High Resolu tion off g Set the 34SSA RANGE to 1 and HIGH RESOLU TION to ON Set the Decade Resistor to 1 000 ohms h Algebraically add the Decade Resistor s correction factor to the 3455A reading The algebraic sum should be within the Test Limits ...

Page 47: ... the test limits listed in Table 4 10 verifying its 1 volt full scale accuracy with High Resolution on e Set the 3455A RANGE to 10 V Set the Transfer Standard for an output of 10 V The 345SA reading should be within the test limits listed in Table 4 10 veri fying its 10 volt full scale accuracy with High Resolu tion on Table 410 DC Aearaey Teat 1 V 10 V Full Stale High Retalulian On evel Renge 24 ...

Page 48: ...nce Divider to warmup and stabilize Table 4 M DC Accuracy Tnt High Resolution Off Divider Output 3455A Range 24 Hour Test Limits 90 Day Test Limits 1000 V 1000 V 999 95 to 1000 05 999 92 to 1000 08 500 V 1000 V 499 97 to 500 03 499 96 to 500 04 100 V 100 V 99 995 to 100 005 99 992 to 100 008 0 1 V 0 1 V 099992 to 1 00008 099989 to 100011 For positive raadirt0s only Do not apply negative voltages g...

Page 49: ... due to the 500 V guard to chassis limitation dd Downrange the dc standard to 1 V output and turn off the dc standard s output Reverse the polarity of the 3455A INPUT connection to obtain negative readings ee Set the 3455A RANGE to 1 kV and HIGH RESOLUTION to ON Set the Reference Divider Out put Voltage switch to 500 V turn the dc standard s out put back on and uprange to SOO V ff Repeat Steps aa ...

Page 50: ... the calibration chart 745A 0 1 error range c Connect the output of the AC Calibrator to the 3455A front panel INPUT d 1 Standard Model 3455A The3455A 1 V 30Hz reading should be within the Test Limits listed in Table 4 13 2 3455A Option 001 The 3455A 1 V 30 Hz ACV reading should be within the Test Limits listed in Table 4 IS e 1 Standard Model 34SSA Using the AC Calibrator verify the 34SSA ac volt...

Page 51: ...eadings should be within the Test Limits given in the table h Set the AC Calibrator for an output of 1 V 10 khz Set the 3455A FUNCTION to ACV and RANGE to 1 V 0 Set the Test Oscillator for an output of 1 V 10 kHz Connect the 50 ohm output of the Test Oscillator terminated in a 50 ohm load to the 3455A front panel INPUT p Adjust the Test Oscillator level controls for a 34S5A reading as close as pos...

Page 52: ...intain reference level on meter of Test Oscillator At each frequency setting the 34SSA reading should be within the Test Limits given in the table Table 4 1S AC Aecuracy Test 30 Hz to 100 hHz 34SSA Option 001 only Frequency ACV Freq uency FAST ACVl Input Level 3455A Range 24 Hour Test Limits 90 Day Test Limits 30 Hz 300 Hz 1 V 1 V 0 99460 to 1 00540 0 99430 to 1 00570 50 Hz 500 Hz 1 V 1 V 0 99630 ...

Page 53: ...s to 10 megohms The correction factors indicated on the decade resistor s calibration chart must be algebraically added to the 3455A display readings to achieve the required test ac curacy 4 50 Tut Procedure Equipment Required Decade Resistor calibrated General Radio Model I433Z DC Voltmeter hp Model 4I9A a Set the 3455A controls as follows FUNCTION 2 WIRE K OHM RANGE 0 1 HIGH RESOLUTION OFF GUARD...

Page 54: ...OHMS SIGNAL output connected to the INPUT r Measure the voltage across the 3455A INPUT ter minals The voltage should be less than S V dc verifying the maximum output voltage specification for an open circuit condition 4 51 COMMON MODE AND NORMAL MODE REJECTION TEST 4 52 Effective common mode rejection is the ratio of the peak common mode voltage to the resultant peak er ror in the reading with a I...

Page 55: ...ading recorded in Step o verifying that the 50 Hz or 60 Hz normal mode rejection is greater than 60 dB k Without disturbing the frequency setting set the AC Calibrator for an output of 70 7 V 100 V peak r This completes the Common Mode and Normal Mode Rejection Tests Disconnect the AC Calibrator 1 The 3455A reading should be within 0 000010 V of from the 3455A and disconnect the GUARD from the the...

Page 56: ...ANGE 1 V GUARD ON INPUT SELECT rear panel FRONT AUTO CAL ON b Connect the Test Oscillator 50 ohm output ter minated in SO ohm load to the 34SSA front panel IN PUT c Set the Test Oscillator frequency to SO Hz and ad just its output level for a 34S5A reading of 1 00000 V d Using short clip leads insert the 1 megohm resistor in series between the terminated Test Oscillator output and the High INPUT t...

Page 57: ...lont linad in Tabla 1 1 For potitiva raadingi only Do not apply nagetrva voltagai greater than SOOVdc AC VOLTMETER ACCURACY TEST 30 Hz TO 1 MHz Standard Modal 3455A Only Frtqu r cv Input Laval 3455A Range 3455A Reading ACV 34SSA Reading FAST ACV Tatt Limitt 30 Hz 1 V 1 V 100 kHz 1 V 1 V 350 kHz 5V 10 V 30 Hz 6V 10 V too kHz 6 V 10 V 1 MHz 1 V 1 V 1 MHz 6V 10 V 30 Hz 10 V 10 V 30 kHz 10 V 10 V 100 ...

Page 58: ...0 kO 10 4 Wire 100 kO 100 4 Wire inn 100 2 Wire t MU 1 K 4 Wire 10 MU 10 K 4 Wire R cord 24 hour or 90 dsy left limit from table de lgnated in teit procedure Derive 6 mondi ie t limits from tpecification listed in Table 1 1 DC VOLTMETER INPUT RESISTANCE TEST 3455A Range Test Reading Test Limits 10 V V 9 99900 V to 10 00000 V 100 V V 9 0900 V to 9 0917 V 2 ...

Page 59: ...For positive reading only Do not apply negative voltages greater than 500 V dc AC VOLTMETER ACCURACY TEST OPTION 001 ONLY Frequeiscy ACVI Frequertey FAST ACV Input Level 34S5A Range 3455A Reading ACV 3455A Reading FAST ACV Test Limits 30 Hz 60 Hz 250 kHz 30 Hz 100 Hz 250 kHz 30 Hz 100 Hz 100 kHz 30 Hz 100 kHz 30 Hz 10 kHz 300 Hz 500 Hz 250 kHz 300 Hz 100 kHz 250 kHz 300 Hz 1 kHz 100 kHz 300 Hz 100...

Page 60: ...O 10 4 Wire 100 kO 100 4 Wire irtft i n inn 2 Wire 1 MO 1 K 4 Wire 10 MO 10K 4Wire Record 34 hour or 90 dty tett llmin from table daeignatad In teti procadura Derive 6 month teet limits from tpecificeiions lilted in Teble 1 1 DC VOLTMETER INPUT RESISTANCE TEST 3456A Test Range Reading Test Limits 10 V V 9 99900 V to 10 00000 V 100 V V 9 0900 V to 9 0917 V 2 ...

Page 61: ...e t hmli from specifications listed in Table 1 1 For positive readings only Do not apply negative voltages greater than 500 V dc DC ACCURACY TEST High Resolution on Input Level 3455A Range 3455A Positive Reading 3455A Negative Reading Test Limits 1 V 1 V 10 V 10 V 1000 V 1000 V 500 V 1000 V 100 V 1000 V 100 V 100 V 60 V 100 V 10 V 100 V 5 V 10 V 1 V 10 V 0 6 V 1 V 0 1 V 1 V Record 24 hour or 90 da...

Page 62: ...0 kHz 50 kHz 100 kHz 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 10 V 30 Hz 300 Hz 10 kHz 20 kHz 10O kHz 100 V 100 V 100 V 100 V 100 V 100 V 100 V lOOV 100 V 100 V 30 Hz 300 Hz 10 kHz 110 kHz 250 kHz 500 kHz 1 MHz 1000 V 1000 V 1000 V 1 V 1 V 1 V 1 V 1000 V 1000 V 1000 V 1 V 1 V 1 V 1 V 110 kHz 260 kHz 500 kHz 1 MHz 6V 6V 6V 6V 10 V 10 V 10 V 10 V...

Page 63: ...ay lett limit from table designated in ten procedure Derive 6 monih test limit from ipecificationt listed in Table 1 1 OHMS VOLTAGE TEST Voltage for Valid Reading V 4 7 V dc Open Circuit Voltaee V t 5 V del COMMON MODE AND NORMAL MODE REJECTION TESTS Reference Step Reference Reading Test 3455A 1 Reading Test Limit Refailve to Raferertcel e OC CMR tO OOOOSOV i AC CMR t 0 000010 V 0 NMR 1 0 0100 V D...

Page 64: ...t limits from specifications listed in Table 1 1 For positive readings only Do not apply negative voltages greater than SOO V dc DC ACCURACY TEST High Resolution on Input Level 345SA Range 34SSA Positive Reading 34S5A Negative Reading Test Limits 1 V 1 V 10 V 1000 V 500 V 100 V 10 V 1000 V 1000 V 1000 V 100 V 100 V so V 100 V 10 V 100 V 5V 10 V 1 V 10 V 0 6 V 1 V 0 1 V 1 V Record 24 hour or 90 day...

Page 65: ...st limits from table designated In test procedure Derive 6 month test limits from ss ecifications listed in Table 1 1 OHMS VOLTAGE TEST Voltage for Valid Reading V 4 7 V dc Open Circuit Voltaae V 6 V del COMMON MODE AND NORMAL MODE REJECTION TESTS Reference Step Reference RMding Test 345SA Reading Test Limit Relative to Referettcel c DC CMR 1 1 0 000050 V 1 AC CMR t 0 000010 V 0 NMR 1 0 0100 V DC ...

Page 66: ... V 50 Hz 500 Hz 10 V 10 V 100 Hz 1 kHz tov 10 V 10 kHz 10 kHz 10 V 10 V 20 kHz 20 kHz 10 V tov 50 kHz 50 kHz 10 V 10 V 100 kHz 100 kHz 10 V 10 V XHz 300 Hz 100 V 100 V SO Hz 500 Hz 100 V 100 V 100 Hz 1 kHz 100 V 100 V 10 kHz 10 kHz 100 V 100 V 50 kHz 50 kHz 100 V 100 V 100 kHz 100 kHz 100 V 100 V XHz 300 Hz 50 Hz 500 Hz 100 Hz 1 kHz 10 kHz 10 kHz 250 kHz 250 kHz 250 kHz 250 kHz 1000 V 1000 V 1000 ...

Page 67: ...nstrument andpro tective covers removed Such maintenance should be performed only by service trained personnel who are aware of the hazards in volved for example fire and electrical shock Where maintenance can be performed without power applied the power should be removed ...

Page 68: ... arc labeled on the top inner cover and rear panel Reference Module of the instrument or arc shown in figures designated in the adjust ment procedures S 11 DC ZERO ADJUSTMENTS Equipment Required DC Digital Voltmeter hp Model 3490A or 3455A a Remove the 34SSA top outer cover and top inner cover to gain access to the AlO Mother board b Set the 34SSA controls as follows FUNCTION DCV Figure 5 1 100 Vo...

Page 69: ...arbon 5 12 DC AND OHMS REFERENCE ADJUSTMENTS S i3 The IX Transfer Standard required for the following adjustments must be adjusted for optimum I volt and 10 volt output accuracy using NBS calibrated voltage standards The Transfer Standard should be adjusted just prior to use After adjustment it should be left on and if possible kept in a controlled environment where the ambient temperature is with...

Page 70: ...lip lead from TP3 and TP6 Adjust R29 LOGGER AMP OFFSET for a 3455A display reading between 0 0998 V and 0 1002 V with a 100 mV 100 Hz signal applied to the input terminals h Set the rear panel AC AC DC switch to AC DC Set the DC Standard for an output of 10 V dc Connect the DC Standard output Negative Polarity to the 34S5A INPUT i Note the 34SSA reading j Reverse the polarity of the DC Standard s ...

Page 71: ...N TRIGGER INT MATH OFF b Set the AC Calibrator for an output of 10 mV 1 kHz Connect the AC Calibrator output to the 34SSA INPUT c Adjust R12 DC OFFSET for a 3455A reading of 0 01000 V 3 counts d Set the AC Calibrator to 1 V 100 kHz use error measurement control Adjust R13 1 V HI FREQ for a 345SA reading of 1 00000 V 5 counts e Set the AC Calibrator frequency to 1 kHz turn off error measurement con...

Page 72: ...eld Office locations are listed at the back of the manual Identify parts by their Hewlett Packard part numbers Include instrument model and serial numbers 6 6 NON LISTEO PARTS 6 7 To 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 6 8 PARTS CHANGES 6 9 Components which have been changed are ...

Page 73: ...c Semicond Cmpnt Oiv Dalles TX 75231 02735 RCA Corp Solid Stats Oiv Sommerville NJ 08876 03888 KDI Pyroftlm Corp Whippiny NJ 07981 04713 Motorola Semicortductor Products Phoenix AZ 85008 07263 Fairchild Semicor ductor Oiv Mountain View CA 94040 11236 CTS of Berne Inc Berne IN 46711 11237 CTS Keene Inc 11S02 TRW Inc 6oona Oiv Boone NC 28607 14140 Edison Elek Oiv McGraw Edlson Manchester NH 03130 15...

Page 74: ... 9A2 AUA4 Ot 00 0291 CA6A 1T0A FX0 IUF IOX 39V0C TA 94269 1900109X903962 A1C41 0160 0196 1 CAPACITOR FXO ISOVF t 20K 2S0WVAC CER Tsteo 0I6O OI9S A1C4 0160 0391 CAPACITOB FXO lUf 1W 38V0C TA seres 1500105X9Q3SA2 AIC43 At OieO 0291 CAPACITOR 6XD igf 10 36VOC TA M200 1S00106XS03SA2 A1C44 Ac 0180 1701 CAPAaTOR Fxe S8UF nK svoc ta IM200 isooeesxooosA AUAi 1901 0200 4 D103E 6HR RECT lOOV 1 5A 04713 SA16...

Page 75: ...O 24546 C6 I 0 TO 1QDI F AlKi 0757 0460 AESISTCB IK IS 1256 4 TCO IOO 24546 C4 1 0 TO 1 001 4 AlAiS 0757 0444 6 AESISTOl lOK IS 1256 4 7C 0 100 24546 C4 I 0 T0 10O2 F AiKSA 0757 0461 AESISIOA 2A It 1256 4 r 0 100 24546 C4 I O f0 2 001 4 AIK37 0757 0411 AESISTQA 2A It 1256 4 TC 04 100 24546 C4 t 9 l0 20Ol F AIK30 0757 0261 AaSISTOA 2A is 1256 4 TC 0 l00 24546 C6 1 0 TO 2901 4 A K3V 0757 0461 KESISI...

Page 76: ...X 1 01299 SNTALSOAN AIJ40 482 1412 C OI6liai SNT6LS76N TIL LS UOAl 01299 SN74LS74M AiJAi IS20 I216 SC OIOIIXL SNT6LSt SN TIL LS I 01299 SNTALSDSH AIU42 19 1969 IC OieiTXL SNT6LS12SN TTL IS OUAO 1 SUS 01295 SNTALSI25N A1J 1820 1660 IC 0I61TXL HI6LS12SN ITL LS OUAO 1 aUS 01299 SN74LS129M AlgAA iaiB 0199 2 IC AH9112APC IK BAN NHGS 94339 AR9112APC Ai0 1616 0199 1C AN9I12APC IK AAM MHOS 34939 AH9112AK ...

Page 77: ...S VISIKE um SNT 2nCD IF 20IU IUX 26460 1990 0547 A CK i 1990 0 7 AEO VIS46I E UJI lHf 2HC0 f 20HA RAX 26460 1990 0967 A 4990 0547 L6 Vl lM e I0n JNT 2HCD tF 20 A RAX 28 80 1990 0547 A HJl 1990 0547 UO VIS44LC LUN SNf 2nCa lf 20llA HAX 26460 1990 0S A bAiA 1990 0 47 U0 VlSiac LOH lHr 2Ma IF 20HA HAX 26463 I99 0S 4 bAi9 1990 0547 U9 VISIBLE Iun 1NT 2HC0 1F 20HS MAX 26460 1990 0841 4990 05A9 0l5fLA7 ...

Page 78: ...APACltUA PXO lilP W04 2MV0C CCA 29490 0140 0127 ALUCiA OlAO l A AAFACI lOa FXO lOOPF F IOS lOOOaVOC CER 29490 0140 1444 AIJAi Oil AAAA CAPACJTOA FaO lOOPP JS lOOOHVDC CCA 29490 0140 1444 A10U9 01 0 2AU6 2 CAPACIIUR FKO 27PF 9t 10U6V0C MICA 29490 0140 2104 AlUUU OlAO 0209 1 CAPACUOA fXO A7PF 500HVOC HtCA 721J9 0M15947020500lfVlCA AlUCIf 0i 4 220A CAAXCLTOA PXO iOOPP iaOHViX MICA 28490 0140 2204 ALU...

Page 79: ...0 Ai CH 19 Cl 0050 OIOOC 0W1TCM1NO 00V 200MA 2N 00 7 20A0O 1901 0050 AlJCh 19Ql 0QSa Oiooe SHIICMIMC BOV 20JNA 2NS 00 7 20A0O 1901 0050 A1JLM 7 i4a 03r A OlOOE WN FKF 3 V MMA 00 2 20400 1901 0128 A gU2A 1901 Oi A OUUE CAN PRP 35V 50HA 00 7 20A0O 1901 03 76 AiJbA y 1902 OiAA OIGDE ZNA 16 2V 50 UO 7 PO AP rC O660 0 713 S2 10939 242 AiJ pA i 19Q2 01AA OIUOE 2MR 1A 2V SX 00 2 FO M 7C F 0AAX OA713 92 1...

Page 80: ...0 7 Aiguil 18M 0 t6 2 rKANSiSfOR J96f DUAL N CHAN 0 NU06 TO 71 264 60 1688 02 A1JUI9 6061 7047 TRANS ISrORt FET KOVAASF 55005 29460 5061 70 7 Aiggi4 5061 7047 IRANS1S70R F61 ROVARSF 53005 26460 5061 70 7 Aijg i 6081 70A7 l4A 8l8iaR FE7 80VAA8F 83008 26460 5061 70A7 AiOl tf 1656 0420 11 Ta4N8l8IQR 2 FEI 2N 3 1 H CH4H D MWE 04713 2N 34I AiOg A 1954 0097 Transistor npn si po 4oiw ft 75nh2 26460 1954 ...

Page 81: ...700 01121 CS202S Ali K i 0603 6225 AeSISTA 6 24 51 256 FC IC 600 700 01121 C06225 AiJR44 0690 7332 ROSISrA IM 11 1256 F IC 06 100 19701 MF5Ciy9 r0 lQ04 F 4iJi 0690 7332 RESISIA IM 11 1256 F tC 0 10Q 19701 NF SCI 9 TQ t006 F 4iaK a 06 03 5145 R6SISTA 5104 51 256 FC 7C 000 900 01121 C95165 0690 6920 5 RESISfA 54 11 1256 F TC 0 25 03099 FME 5 S 1 0 T 9 5001 9 Aigk 4 0690 6320 RESlSfA 54 11 1256 F K 0...

Page 82: ...144 SH7 IS17 H 171 IS HEX 01293 SN76LS174N AiOtilA 1820 1198 IC DIUTAI SN7US174N TTL LS HEX 01299 SN7 ISI 7 N AijgiA 1820 U16 IC DUITAL SM74LS138N TTL LS 3 01299 SNI LSI36N Aiug 9 1820 1196 JV 0I81XAU SN74LS174M TfL LS HEX 01299 SN76LS174M AiUUlA 1620 1196 1C 0I61T4L SN7 L 17 H TTL IS HEX 01299 SN76LS174N A guil 18 0 1196 ll OICIIAl SN74LS174N 111 IS HEX 01299 SN76LS1 74N Aluulb 1826 0147 11 HC 1 ...

Page 83: ...6 26W FC TC 400 800 RESISTOR 43K 6 25W FC TC ADO TOO RESISTOR IW Ik 6W P TC 0 100 RESISTOR 27K Sk 2SW FC TC 400 800 RfSISTOR 1 I3K t 12SW P TC D ICO RESISTOR 6 87K Ik I26W P TC O I00 RESISTOR 0K Ik I26W P TC 0 tOO RESISTOR 17K 6k 76W FC TC 400 800 RESISTOR 470 6k 26W FC TC 400 800 RES STOR 2 4K 6k 76W PC TC 400 TOO RESISTOR 30K Sk 2SW PC TC 400 800 0888 3461 0883 7736 0767 044 0883 4336 0663 1636 ...

Page 84: ...ORC 28660 0160 3677 0160 0202 1 CAFACITOR FXO ISFF 4 S 900VVOC MICA 72136 0Mi9ClStU0900 VlCR AliLSy 0160 3930 1 CAFACIIOA FXO lOFF 18 2SQ0MVDC FORC 28600 0140 3930 AUC3A 0121 0636 2 CAFACJUR V TRMR AtR 2 6 26 9Ff 390V 76970 U9 S09 12S AlMi 0l a s 8i 2 CAPACIIOR FXO lUF 4 209 6306VOC NCY FR002 00710640 AtiCKi 1902 3237 3 0100E 2NR 20V 99 00 7 F0 6H TC 4 0739 08713 S2 10639 286 AUtA 1901 0033 2 OIOO...

Page 85: ...I002 F AIM34 0 B U S RESISTOR UK St 25W FC TC 400 600 01121 CB12SS 06n 302S RESISIOR 3K 56 ISU FC TC 400 4700 01121 tajius AlJK o 21CO 3304 RESISTA XU6 SOK lOS C SIOE ADJ 17 764 32997 3006P 1 503 AljKi 04 63 4715 RESISTW 70 St 2SU FC TC 0a 600 01121 C64715 AAik30 3498 621 5 RESISTOR AtTK 5 P 0 MATCHED SET R2S 3S 43I 26460 0696 6215 AliJC 9 0499 4202 RESISIOR 6 67K it l25lT F TC 0 100 24544 e i B T...

Page 86: ... 644 18 1236 F TC 0 100 24544 C4 1 6 T0 4641 F 414424 0643 4213 1 4831 SrU4 420 3C 23H FC TC 400 600 OUEI C66213 at u ag Da 3 o RESISIOR tOK SB ESe FC TC A00 700 01607 C61Q36 attiua AB 0643 1038 RESISTOR TOK SB 250 FC tC a00 7O0 01007 C01036 414424 0 6 94 3260 2 4EStSTtt 4644 18 USV F TC 0 100 9163 CnF 3 l T i 41442 0694 4649 Z 4tSl T04 1 2M IS 23H F TC 06 23 1970L nF32C l 41442S 0643 2733 RESISTO...

Page 87: ...COIL 28490 0490 0883 AI501 1854 0071 TRANSISTOR NPN Si FD 300MW FT 20CMHZ 28480 18S4 0071 A1SQ2 04 1895 0420 TRANSISTOR J FET 2N4381 N CHAN D MOOE 04713 2N4391 AI QS idss ooe 1 TRANSISTOR J FETN CHAN D MOOE Si 28480 1955 0062 A1S06 1664 0071 TRANSISTOR NPN 01 PO 30OMW FT 200MH 28480 16 4 0071 A1B07 1653 0030 TRANSISTOR PNP 1 P0 300MW FT 160MIU 29480 1853 0020 AIS08 1855 0420 TRANSISTOR J FET 2N439...

Page 88: ...i eOO 01607 CB1335 Aisnes 0663 1039 RESISTOR 10K 5 35W FC TC 400 700 01131 CB1035 AI5R69 0663 1039 RESISTOR 10K 8 35W FC TC 400 700 01121 CBtan AI6R7t 0757 1 RESISTOR 332 A1SR72 8 ZIQ0 31Z2 2 RESISTOR TAMR 100 10 C TOP 03744 3006P 1 101 A15R73 3100 3066 R6SISTOR TRMR 5K 10 C l06 AOJ 17 TRN 01885 43P503 A1 R74 2100 3306 REStSTOR TRMR 50A 10 C OE ADJ 17 TRN 32997 3005P 1 503 A1SR76 As 210O 3T94 1 RE...

Page 89: ...013 S 3101 2043 2 SWITCH Sl OPOT NS STD 2A 2S0VAC SLDR LUG 264B0 3101 2042 ss 3101 2042 WITCH L OPOT NS STD 2A 250VAC SLDR LUG 29480 3101 2042 se 3101 2216 1 SWITCM P6 OPOT 4A 250VAC 28480 3101 2215 040 7023 1 PUSH ROO 284B0 5G40 7023 S7 3101 1206 1 SWITCH P8 OPOT ALTP4G A 115VAC PC 28480 3101 1299 0370 0683 1 PUSHBUTTON OLIVE BLACK 28480 0370 0683 TJ 9100 0680 1 TRANSFORMER POWER 78480 9100 0680 ...

Page 90: ...00 0574 1 nOCRINO 6IRAP 26460 1400 0574 AP49 uJU3 m 10j 1 CiMBD ilUE 2BAB0 03A33 0010E MnO 0405 0162 03466 00603 1 GUIDE PC BO BIK POLVC On BO THKNS l LG SHIELD C CONVERTER 26480 26460 0403 OIK 034 00e03 AP I OJ455 V1203 BBACAET FT TEU 26460 03433 01203 034SS 08IOT 1 COVER V0LIA6E hEGULATOR 26460 03433 0410T H9Z 09455 01201 1 MACRETt REE6RENCE 26460 03433 01201 HP 4 04 09 0141 09455 00602 i COIOE ...

Page 91: ...e manual normally contains informa tion necessary to adapt this manual to instruments for which the content does not directly apply Since at this printing the manual does apply directly to instruments having serial numbers listed on the title page no change information is given here 7 1 7 2 ...

Page 92: ...ctive grounding conductor inside or outside the instrument or disconnection of the protective earth terminal is likely to make the instrument dangerous Intentional interruption of the protective grounding conductor is strictly prohibited 8 6 It is possible for capacitors inside the instrument to still be charged even if the instrument has been discon connected from its power sources 8 7 Be certain...

Page 93: ...he Multi meter from 4 wirc to 2 wire ohms measurement capability The Input terminals are connected to the dc preampli fier input on the 1 V dc thruugli 10 V dc and all Ohms ranges by relay K1 and FFT switch Ql Relay KS connects the input to the operational attenuator on the 100 and 1000 V dc ranges Output of the Attenuator is connected to the input of the dc preamplifier by FET switch 01 S on the ...

Page 94: ...Voltmeter A basic equation describing a measurement of one of the three inputs is V E Eq G where V is the par ticular output E is one of the three inputs Eq is the internal offset error and G is the circuit gain Closing switch SI applies the internal reference voltage The circuit output would be Vjef Eref O offset error is measured by closing S2 grounding the input The resultant output would be Vg...

Page 95: ...cription 8 23 Figure 8 S shows a simplified schematic of the auto cal switching circuitry The following paragraphs describe circuit operation for the various auto cal measurements 8 24 10 V dc Input Offset Error Measurement Figure 8 6 illustrates the circuit configuration for making the 10V dc Figure 8 10 V dc Input Offset Error Measurement 8 4 ...

Page 96: ...itch A10Q34 see Figure 8 9 On the 100 V dc range the feedback of the operational attenuator is selected by FET switch A10Q3S attenuation of 10 to l The output of the operational attenuator is applied to the input of the DC Preamp throu FET switch AIOQIS Attenuator feedback on the 1000 V dc range is selected by FET switch A10Q39 atten uation of 100 to 1 and is applied to the DC Preamp input through...

Page 97: ...arate offset Error measurement is made to include any the I V dc full scale reference was derived by dividing the offsets present in the ten to one divider and associated internal reference by the precision ten to one divider a circuitry Figure 8 12 illustrates the circuit configuration Measurement 8 6 ...

Page 98: ...asurement input of the DC Preamp is grounded through the len to onc Figure 8 13 shows the circuit arrangement for making the divider by FET switch AI0Q16 Preamp gain is XIO 100 V dc gain error measurement The reference voltage is Figure 8 1 1 1 V dc ar d 1 V dc Gain Error Measurement Figure 8 12 1 V dc Reference Offset Error Measurement 8 7 ...

Page 99: ...e attenu A10Q15 A DC preamp gain of XIO is selected by FET atur is set to a gain of 0 1 10 to I attenuation by FET switch AI0Q21 The measurement result is stored by the switch AI 0Q3S The output of the operational attenuator main controller as the lOO V dc gain error constant Figure 8 13 100 V dc and 1000 V dc Gain Error Measurement Figure 8 14 100 V dc Reference Offset Error Measurement 8 8 ...

Page 100: ...eference resistance measurements The voltage developed across the unknown resistor is mea sured by closing SI while the reference voltage developed across the reference resistor is measured by closing S2 The value of the unknown resistance is computed by the main controller An equation describing this computation is HVRx 6o Gi EoGil R Kr IVrEF Eol G2 Eo Ga Figure 8 15 Basic Ohms Measurement Diagra...

Page 101: ...h A10Q18 A separate measurement is made for plied to the DC Preamp input through FET switch both gains and the results are stored by the main controller A10Q14 On the 1 MJ2 and lOMD ranges relay A10K8 is 8 40 1 kSl 1 kn 10 kf2 Reference Measurements The e 7 M current source is applied to the 1 Mfi ohms reference voltage is developed across the reference reference resistance The reference voltage i...

Page 102: ...The frequency range of the true rms converter is 30 Hz to 1 MHz during normal operation and 300 Hz to 1 MHz during fast ACV operation Full scale output of the rms converter is 6 6667 V dc Figure 8 19 is a simplified schematic of the true rms converter The mathematical expression describing the measurement of an rms level is V output V in which states that the output voltage Vo is equal to the squa...

Page 103: ...mpedance An operational amplifier provides the necessary gain to drive the output stage of the converter amplifier The out put stage of the amplifier is a current driver circuit Two ac feedback paths provide fixed gains of 1 or 0 1 An integrat ing amplifier U4 is used to maintain a dc level of 0 V dc at the output of the Converter Amplifier The integrating amplifier also determines the low frequen...

Page 104: ... 68 Circuit Description 8 69 Ohms Converter Power Supply An inverter circuit is used to derive power for the ohms converter The inverter operates at a frequency of 30 72 kHz on 60 Hz operation or 2S 6 kHz on 50 Hz operation Transformers AlOTl and AI2T1 provide complete isolation of the ohms converter 8 70 Current Source Figure 8 21 shows a simplified sche matic of the current source used in the oh...

Page 105: ...circuits for use in the A to D Con verter The DC Preamplifier is designed to provide high input impedance and linear gain characteristics 8 76 Circuit Description 8 77 Input Circuit A dual FET Q17 is used as the input to the DC Preamplifier to provide high input impedance The sources of Q17 are driven by a current source Q24 to maintain linear circuit operation Operational amplifier U2 provides th...

Page 106: ...5 ...

Page 107: ...e 34SSA Multimeter uses a multi slope integration technique to convert analog input signals to digital informa tion This method permits relatively high speed high accur acy measurements The following explanation of the A D Converter operation uses the integrator output waveform pictured in Figure 8 26 The waveform shown is for a nega tive input voltage For positive inputs the integrator output wou...

Page 108: ... point of complete dis charge This type of run down permits both speed and ac curacy The counts accumulated during the run down period T2 are scaled and added to those made during time T 1 for the final measurement 8 92 Circuit Description 8 93 Input and Reference Switching The A D input and reference switching is controlled by the inguard controller The input from the DC Preamp is applied to the ...

Page 109: ...p the input voltage at 0 V see Figure 8 29 8 97 Slope Amplifier The purpose of he ope amplifier is to increase he speed of the auto xero function and reduce sensitivity to offsets in the aero detect comparator The slope amplifier is a conventional non inverting operat ional amplifier with a gain of 100 and is used to drive the auto zero circuitry and zero detect comparator Sensitivity at he output...

Page 110: ...rred from the inguard controller to Figure 8 30 Simplified Inguard Controller Flowchart the main controller This information contains the measure ment value and polarity plus a parity bit and is transferred serially at a rate determined by he main controller The inguard controller is reset to receive mure information by a reset pulse from the main controller 8 107 Circuit Description 8 108 Transfe...

Page 111: ...e transformer is used to electrically isolate the reset line between the inguard and outguard sections of the voltmeter The reset pulse applied to the preset input of flip flop U32A sets the Q output high The high output of U32A causes the output of U276 to go low The output of U27B sets the interrupt request input of the inguard processor Upon receiving interrupt request the processor stops drivi...

Page 112: ...able the zero detect circuit As the charge on the A D Integrator passes through 0 volts the polarity detect signal changes state and causes the output of the zero detect circuit to go low The low output from the zero detect circuit sets the processor s interrupt input to stop the A D Conversion pro Table 6 2 A D Converter Switch Control Signal DeKriptions Signal Description True State LVIN A D Con...

Page 113: ...tches is synchronized by he clock input to the processor and he device select decoder U14 8 115 MAIN CONTROLLER 8116 General 8 1 17 The purpose of the main controller is to control communication between the front panel HP IB interface display and inguard section of the multimeter and to per form mathematical calculations to correct measurement data and provide measurement scaling or percent error ...

Page 114: ... math answer f The main controller next checks to see if the HP IB buffers are active outputting data to the bus If the HP IB buffers are not active the main controller loads the answer into them If the buffers are active the controller bypasses this step g The main controller loads the fmal answer in the dis play buffers and returns to the start of the program 8 1 18 Circuit Description B 119 ROM...

Page 115: ...f address line PAIO is low which allows U8 to be enabled and holds ofT the enable circuitry for ROM s U6 and U7 To enable ROM s U6 or U7 the foUowing sequence is used a The code to select the desired ROM and page is set on data lines D0 and Dl Line D0 is used to select the page and is set high for upper pages and low for lower pages Line Dl is used to select the particular ROM and is set high to s...

Page 116: ...ress each step and results in higher operating speed 8 124 The RAM s are addressed by the main processor in the following manner a The processor sets the desired address code on data lines DQ through D7 sets the proper code on the device select lines DS0 through DS3 to activate output Y4 of device select decoder U4I and sets the Read Write output high write b The outputs of the processor and the d...

Page 117: ...e select decoder is applied through gate U38D to the clock input of counters U36 and U37 to increment them to the next address 8 127 ALU Circuit The Arithmetic Logic Unit ALU provides added computational capability to the main con troller for computing Auto Cal constants measurement data corrections and scale and error math func tions The ALU also provides logic functions which are used for certai...

Page 118: ...orities In the event of two or more Simultane ous Interrupt Signals the one with the highest priority will be handled first The HP IB Interrupt is assigned the highest priority and will be serviced before the external trigger or front panel interrupts The external trigger interrupt is assigned the second highest priority and will be serviced before the front panel interrupt All three interrupt sig...

Page 119: ...and USSC high 8 134 As the output of multivibrator U46A returns high the following occurs a The front panel output latch is set to the new switch status code b The positive going _ al is applied to the dock input of U40A to set the Q output low This signal applied through U47B and U39C disables the input of U48A to prevent premature retri ering c Interrupt gate USSC is enabled to set the main pro ...

Page 120: ...rn on interrupt circuit 8 141 HP iB CIRCUIT 8 142 General the integration of instruments calculators and computers into systems The HP IB employs a 16 line Bus to inter connect up to IS instruments Normally this Bus is the sole communication link between the interconnected units Each instrument on the Bus is connected in parallel to the 16 Bus lines Eight of the lines are used to transmit data whi...

Page 121: ...disables qualifier gates U2D UI4B U14D and UI3D and is applied to U2C to set its output high The high output of U2C sets the enable inputs of UlSA and U13B The high output of U13B is applied to the driver B input of transceiver U9 to set the NDAC output low true This indicates to the HP IB controller that the Voltmeter is ready to accept data 8 149 After allowing time for the data on the DIO lines...

Page 122: ...ssor sets the output pin 7 of latch U70 high to turn the talk enunciator A2CR3 off see Front Panel Assembly Schematic The processor next sets the dav req output 5Q of latch U 1 1 low false to return the interface circuit to the turn on state 8 157 Handshake Completion After all instruments on the HP IB have accepted the command data the NDAC Bus line has gone high the HP IB controller sets DAV hig...

Page 123: ... are ready to accept data NRFD is high the output of qualifier gate U14C is set low The output of UI4C is applied to the input ofbuffer U16C and the input of interrupt gate U7C The low output of U7C is applied to the input of U2A which sets the inter rupt output to the processor 8 166 Upon recognizing the interrupt signal the processor enables buffers UIS and UI6 to read the status word After dete...

Page 124: ... through 1Y3 are enabled by the signal from device select decoder U41 Outputs 2Y0 and 2Y1 are enabled by 8 173 Display Measurement data is transferred to the display one number at a time The polarity or numerical data is applied to the input of latch US4 and the digit or position in the display and decimal information is applied to the input of latch U63 The output of device select decoder U41 is ...

Page 125: ...ontroller circuits are used to control communication between the front panel HP IB inter face and the Inguard Section The controller also per forms mathematical calculations to correct measure ment data and to provide instrument scaling or percent error readings 8 182 The heart of the main controller circuits is a pro cessor referred to as the nanoprocessor used in con junction with the main contr...

Page 126: ...nd the range of he instrument This voltage is measured along with a voltage drop across a reference resistor by the DC circuits of the 3455A The DC readings are then converted to digital readings and passed on to the main controller The reading is then calculated by the main controller to an ohms reading to be displayed on he front panel 8 191 The 3455A offers a choice of either a True RMS or an A...

Page 127: ...onnec tions Reversing the service cable should verify the defective section of the inoperative 34SSA and also the working section NOTE Make sure the power supplies of the in operative 34S5A are good b Once it has been determined in what section the defective is located Inguard or Outguard the correct Service Group can be used for component isolation see Paragraph 8 198 for a summary of the Service...

Page 128: ...Turn Over Errors Paragraph 8 G 4 A10 A14 1 5 6 Other Troubleshooting Paragraph 8 G 6 A1 A3 A10 6 11 H Troubleshooting Diagrams General Troubleshooting Diagram Inguard Troubleshooting Diagrams Outguard Troubleshooting Diagrams Schematics Paragraph 8 I I 1 Paragraph 8 H 3 Paragraph 8 H 4 Paragraph 8 H 6 Figure 8 H 28 A1 A10 A10 A1 All 1 to 11 Group B Use this service group if an OL overload conditio...

Page 129: ... given in this group g Miscellaneous Troubleshooting Service Group G This service group can be used for troubleshooting power supplies reference assembly turn over errors and others The troubleshooting information in this group does not fit in the other groups h Troubleshooting Diagrams Service Croup H Troubleshooting Diagrams may be used to service the 3455A in place of the other service groups T...

Page 130: ...e 3455A does not have one schematic 8 c Troubleshoot the outguard turn on circuit AIDS U26 and associated components Check for a pulse at tum on as shown below which can be seen at U26 pin 9 This pulse connects to inverter U5 which holds data lines D2 through D7 low for the duration of the pulse The processor should turn on at the trailing edge of that pulse I 1 SV I Li 60 250mSeC d Check the Nano...

Page 131: ...shoot the interrupt circuit con sisting of U32A and U27 f Check for toggling outputs on pins 2 4 6 8 10 and 12 of U22 g The outputs pins 9 to IS of U14 should also toggle with 500 nano second wide negative pulses h Check operation of latches Ull to UI3 UlS to U17 and ROM U2S i Make sure that the zero detea signal U32B pin 12 is not loaded down by anything on the AIO board 8 A 10 AID Board Troubloa...

Page 132: ... from in guard to outguard F2 is the handshake line and F3 is the data transfer line b HAZ line must be high if not check TPIO c Use the Inguard Outguard transfer circuit troubleshooting diagram Figure 8 H 17 for further troubleshooting d The inguard power supply regulators 10U36 to U39 can also cause transfer problems The outguard should power up after the inguard Check for a slow more than 2 X1 ...

Page 133: ...put attenuator at XI gain Figure 6 8 2 Paragraph 8 27 9 Ohms and 5 V offsets X20 gain with amplllier input tied to grourtd Input anen tuator at XI gain Figure 8 B 3 Paragraph 8 39 8 Ohms and 5 V offsets X2 gain with amplifier input tied to ground Input et tenuator of XI gain Figure 8 B 4 Paragraph 8 39 7 100 V offset 2 XI gain with amplifier input tied to 10 1 attenuator with top of 10 1 attenuato...

Page 134: ... 3433A is still in the self test mode another measurement is taken A dummy cal constant calculation is performed in the outguard section of the 3433A If this calculation is correct answer should be 10 nothing will be displayed The instrument will then finish the self test operation If the dummy calculation is in correct a non integer number e g 9 998 or 10 002 will be displayed on the front panel ...

Page 135: ...Model 3455A SERVICE GROUP B Section VIII Figure B B 3 Aute Cal Contunt US 10 K 100 K aid 10 M Offsau Figure 0 0 4 Auto Cel Cenetant 8 10 K 100 K and 10 M Offtets 8 45 ...

Page 136: ...Section VIII SERVICE GROUP B Model 3455A Figira 8 B S Aute Cil ConsUnt D 7 100 V OHsat 2 Figure 8 B 6 AutoCal Constant Mt 11000 V Offut 8 46 ...

Page 137: ...Model 3455A SERVICE GROUP B Section Vlll Figure 8 B 7 Auto Cal Constant 100 V Gain Figure 8 B 8 Aulo Cal Consunt 4 100 V OHset t 8 47 ...

Page 138: ...Section Vill SERVICE GROUP B Model 3455A Figure 8 B 9 Auto Cel Conttent 3 1 V Offset Figure B B 10 Auto Cel ConsUnt 2 1 V Offset 1 8 48 ...

Page 139: ...Model 345SA SERVICE GROUP B Section VIII Figure 8 B 11 Auto Cei Constant 1 1 V OHMt HI Figure B 8 12 Auto Cel Constent 0 II V 6ein 8 49 ...

Page 140: ...ent should now be stopped at a certain cal constant b Make sure the 34SSA is out of the Auto Cal mode Press the AUTO CAL button again if necessary the light in the AUTO CAL button should be ofO c To locate the desired cal constant or to go through the cal constants completely briefly press the AUTO CAL button twice to turn Auto Cal on and off Each time Auto Cal is turned on and off the Auto Cal ci...

Page 141: ...L L H L L L L 5 7 L L L t L L L L L L L L L L 7 9 H H H L H H L L H L L L H H 9 11 L L L L L L H H L L H H L L 11 13 24 24 24 24 24 24 9 9 24 24 9 9 9 24 24 13 14 H 0 9 24 9 1 24 24 9 24 24 24 1 1 14 U6 1 1 0 24 24 24 24 9 24 24 24 24 24 1 1 1 2 24 24 24 9 24 24 24 24 24 9 24 24 24 24 2 5 L L L H L L L L L H L L L L 5 7 H H L L L L H L L L L L H H 7 9 L L L L L L H L L L L L L L 9 11 L L L L L L L...

Page 142: ...ints 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Approximate A 1 0TP4 Voltage Voltage at the Multiplexer Mode Source of A10QY Voltage at the Junction of A10K6 and A10R47 A10TP2 Voltage 0 0 0 10 0 0 0 6 10 0 0 0 0 10 10 9 9009 8 B 14 Switch Closure Table 8 B 15 Most of the switch closures used in the 345SA are listed in Table 8 B 6 This table lists the previous closures dependent on the range function and Auto...

Page 143: ... 0 1 0 0 0 0 1 0 0 0 0 1 0 1 0 0 0 1 1 0 0 1 0 1 0 0 0 X 0 0 1 0 1 0 1 0 1 0 X 0 0 0 0 1 0 t 0 1 0 X 0 0 0 0 1 0 1 0 1 0 X 0 0 0 0 t 0 t 0 1 0 X 0 0 0 0 1 0 1 0 0 0 X 0 0 1 0 1 0 1 0 0 0 X 0 0 1 0 1 0 1 0 1 0 X 0 0 0 0 1 0 1 0 1 0 X 0 0 0 0 1 0 1 0 1 0 X 0 0 0 0 1 0 1 0 1 0 X 0 0 0 0 1 0 t 0 0 0 X 0 0 t 0 1 0 1 0 0 t 0 1 0 0 0 1 0 0 1 0 1 0 0 1 0 1 0 0 t 0 1 0 0 1 0 1 0 0 1 0 1 0 0 t 0 t 0 0 1 0 1...

Page 144: ...Q4 Shorted 1 1 10 7 6 0000 A10Q19 Open 1 1 9 8 3 2 A10U3 10 9 5 3 9 7650 A 10Q 16 Shorted 10 5 0 0000 A14Q3 Open 10 9 3 0 A10Q15 Shorted 10 6 5 1 0 A10Q18 Shorted 10 9 5 0 9 5703 A10Q2 Shorted 10 2 5026 A10Q4 Open 10 9 8 3 2 A10Q21 Shorted A 1002 Open 9 7 6 5 4 3 1 0 A10U18 or A10037 9 7 6 5 4 3 1 0 Reference Supply 9 7 6 5 4 3 2 1 0 A 1002 9 and or A 10031 Shorted 9 5 3 0 A 1003 9 Shorted 9 3 A10...

Page 145: ...ear on the multiplex mode and t 10 V should be at A10TP4 If the multiplex mode reading is bad troubleshoot the input circuit If the reading at TP4 is bad make sure A10Q21 is turned on Check for leaky Q22 CR12 CR13 or a defective U3 If TP4 reads good set up the 34S5A for the self test mode by pressing the TEST button Check for cal constant 0 failing and if it does troubleshoot the failure by using ...

Page 146: ...that some of the same circuits are used in the 100 V range The 100 V range zero and gain should be working before troubleshooting the 1000 V range Check for the proper switch closures used in cal constant 6 use the procedure of paragraph 3 B 1 1 to locate constant 6 b For a 1000 V gain check use the procedure of paragraph 8 B 24b c Set the 34SSA to the 1000 V range with Auto Cal on and apply 1 XX ...

Page 147: ...ce then A10Q4 may be open or K6 may be shorted j If Auto Cal constant S fails and the 100 V and 1000 V ranges are way out of tolerance then A10R46 or R63 could have changed value k If 17 V appears on the multiplex node check for a defective A10Q15 Q18 CR12 or U12 8 B 31 General Noise 8 B 32 Noise in the 34S3A may show up in one or more functions If more than one function is noisy it usually indica...

Page 148: ...se on the 100 mV range Short the input of the 3455A with Auto Cal off Measure the voltage level at AlOTPl It the voltage is noisy try replacing R69 R71 U18 or Q37 If TPl is not noisy measure with a DVM across TPS and TP6 The low input of the DVM should be connected to TP6 and the high input to TPS If excessive noise is measured replace U3 f Noise and S counts to 10 counts turnover on the 1 V range...

Page 149: ...2I padding list is in the parts list f Remove the short form the input of the 34SSA Apply a 10 V 100 Hz sinewave at the input ter minals Check for the following voltages 1 With an oscilloscope check for a sinewave at A15TP8 The amplitude of the sinewave should be approximately 2 8 V peak to peak with no shift in the dc level go to paragraph 8 C 4 if bad 2 A halfwave rectified sinewave should be ob...

Page 150: ...ing is good replace Q19 3 If the reading at TPS is still bad short the drain to the source of Q18 If the reading is then good replace Q18 4 If the reading at TPS is still bad short TPS to the junction of R86 and R87 If the reading is corrected troubleshoot the feedback network e If the 3455A has a history of bad QI9 s replace Kl K3 and QI8 Q18 may be damaged if Q19 has been damaged The timing of K...

Page 151: ...ng amplifier integrator and antilog circuits are connected by feedback paths Isolation of these circuits may be difficult There are however some checks used to help troubleshoot these circuits except where noted the input signal should be a 10 V 100 Hz sinewave a In some cases it is possible to isolate the integrator from the other circuits on the A15 board This can be accomplished by shorting TP6...

Page 152: ...for the addition of C40 is as follows 1 Remove CR3 and install pins into the eyelet holes where CR3 has been removed 2 Solder both CR3 and C40 to the pins Make sure CR3 is mounted in the correct direction b Difficulty in balancing ac and dc input signals with the 3453A set for ac dc operation Try changing R5S c Large differences with the 34SSA set for ac and ac dc operation change R95 to 806 ohms ...

Page 153: ... the dc level is incorrect perform the next step 3 Set the 34SSA to the fast ac function Measure the voltage at the junction of R4 and RS and the gate levels of Q2 and Q8 The voltage should be approximately IS V dc Next set the 3455A to the normal ac function The gate levels of Q2 and Q8 should be approximately zero and the Junction of R4 and RS should be approximately IS V dc The gate levels of Q...

Page 154: ... Short the rear terminals guard to low l The ac convertor should be calibrated with the guard cover in place 8 C 17 Average Responding AC Convertor Schematic 2 8 C 18 Due to the simplicity of the average responding ac convertors only a few pertinent troubleshooting hints are given a Component location and layout may be critical to the convenor s freqency response Capacitors especially in the input...

Page 155: ... 8 D 6 for further troubleshooting c When approximately 4 7 V is observed at the input terminals the ohms convertor is in voltage limit This is a correct indication with an open circuit input Connect a 1 K ohm resistor across the in put terminals of the 34SSA Measure the voltage drop across the resistor The voltage should be ap proximately 7 V dc and indicates correct constant current operation of...

Page 156: ...s and 4 wire ohms not zeroing properly and the reading changes 100 counts when the 3455A is tapped Check for a dirty front rear switch e 10 K and 10 M ranges read low Check AKXJ27 Q22 or U3 B D 9 Ohffls Offsets 8 D lO The following information may be helpful in isolating ohms offsets Again make sure the 3455A works correctly in dc a If there is a 150 counts to 200 counts offset on the 1 K ohm rang...

Page 157: ...he HOLD MANUAL button and observe for any oscillation at TP4 If any oscillation is noted try changing A10C4 to 0068 part number 0160 0159 and AlORl 1 to 1 3 K part number 0757 0426 f Noisy at I M and or 10 M ranges Push all wiring away from the ohms board and all input wiring away from the top guard cover place the red wire connected between the front rear switch and the AlO board next to the guar...

Page 158: ...455A off and disconnect the AlOWI Inguard Outguard Cable assembly from the outguard connector A1J7 b Remove the analog test jumper from A10U27 pin 10 and connect test point A10TP9 to ground c Apply 10 V dc to the input terminals of the 34SSA and turn the instrument on d With an oscilloscope measure the waveform at AlOTPl The waveform should look like top waveform in Figure 8 E l e The correct wave...

Page 159: ...rt from C2 and continue with this procedure f Short AI4TP1 to ground and measure the 0 detect 10 V detect and 2 V detect levels The table below gives the correct detect levels Remove the short from TPl and apply 10 V to TPl Measure the levels of the 0 detect 10 V detect and 2 V detect See the table below for the correct levels A14TP1 Shorted A14TP1 at 10 V 0 Detect Level s 5 V s 0 V 1 0 V Detect L...

Page 160: ...gate bias voltage B G of the processor A10U26 pin 387 The voltage should be within 25 V of the voltage marked on the processor If the voltage is incorrect check for the correct value of pad resistor A10R105 pad list in parts list If the pad resistor is the correct value and the bias voltage is incorrect replace the processor 8 E 12 Inguard Logic Troubleshooting with no AfO Waveform a The signals a...

Page 161: ...sure Constant 3 1 kV Range Enable Cal Constant 0 1 6 1 High True Measure Constant 4 Measures 1 V Gain Cal Constant 0 High True Measure DC 1 100 V Rangel High True Measure DC 2 1 V 1 V 10 V Range and Measure Unk HM01 HM02 HPD1 HPD2 HPD3 HP01 HPRF HPRS HR12 HR24 HR34 LACF LAC3 LAC5 LNRF LNRS LVIN High True Measure Ohms 1 Measure Ohms Ref Range 100 K 1 M 10 M High True Measure Ohms 2 Measure Ohms Ref...

Page 162: ... second pulses at the device select lines of U26 pins 12 to 15 If the pulses are good U14 may be at fault 8 E 13 Inguard logic Troublashooting with an A D Wavaform a Check the light isolators and associated circuits as explained in paragraph 8 E 12a b Check for a defective A10U26 c Check for an open A10CR41 and CR42 These diodes may cause glitches on U26pin 29 causing the processor to be interrupt...

Page 163: ...peak to peak Check for any circuits that may cause loading b Sharp peaks of 3 V to 3 5 V may be observed on some lines of the processor A3U9 This is normal The peaks are present when the processor is in a tri state mode c Check the back gate bias voltage G B of the outguard processor A3U9 If the voltage is dif ferent from the voltage marked on the processor by 35 V check for the correct value of t...

Page 164: ...Ds A2CR5 to CRl 1 CR19 to CR22 and CR24 to CR35 from hp part numlKt 099 W 547 to hp part number 1990 0665 These changes should be made for instruments with serial number I622A0I336 and below A procedure for changing or replacing LED s are in paragraph 8 F 7 f A modification to reduce key bounce is as follows Change A1U57 from a 9318 to 98L18 part number 1820 0987 A2R17 and R18 from a 2 2 K ohm res...

Page 165: ...eps 6 and 7 of Replace before replacing switch it could save time It is important to use a low or medium temperature tip soldering iron as exposure to SOO Ffor over S seconds could damage the LED s 8 F B HP IB Troubleshooting Schematic 9 8 D 9 Before troubleshooting the HP IB section of the 3455A verify that the 3455A is malfunction ing and make sure the problem is not due to externa programming s...

Page 166: ...to 9 9 V Inguard processor must be installed 2 Ohms supply voltages AlOTl pins 1 and 3 10 V rms 20 V peak to peak square wave AlOTl and AI2T1 connection 2 V rms 25 V open circuit square wave A12T1 pins 1 and 3 40 V rms 80 V peak to peak square wave 3 Allowable noise on the ohms supply as measured with a true rms voltmeter 6 2 V supply 30 iV noise 6 2 V supply 60 iV noise d If the fuse of the 3455A...

Page 167: ...b Check the A D converter A14 if turn over differences arc observed Replace if necessary c Turn over errors on all ranges Unsolder CRl and CR2 from the AlO board If the error disappears CRl and or CR2 may be leaky Make sure the 10 V and 10 V references are good A10TP8 should be 10 V 100 V and A10TP7 should be 10 V 20 mV d Turn over differences on the 10 V range Check AlOUl U2 Q7 or QI8 Other possi...

Page 168: ... used to isolate the two main sections of he instru ment Inguard and Ouiguard The second group deals with the Inguard section and the third group can be used for Outguard Troubleshooting 8 H 3 General Troubleshooting Diagram 8 H 4 The General Troubleshooting Diagram Figure 8 H 2 may be used in place of the Half Splitting Technique of paragraph 8 196 Since this method is not as complete as the Half...

Page 169: ...Figure 8 H 1 Assembly and Test Point Locations ...

Page 170: ...s And Theory of Opera tion For Troubleshooting The Other Circuitry YES A Failure Code Indicates That One Or More Of The Auto Cal Constants Is Out Of Test Limits Record Number Displayed 1 Turn The Instrument OFF Disconnect The Test Jumper On the A3 Assem bly And The Connector From A1J7 Turn The Instrument ON Proper Operation Of The Out guard Test Routine Is Indicated By A Number or Character Being ...

Page 171: ......

Page 172: ... 23 C 3 0 3338 8 46 E 11 c 2 22 A 23 F 37 39 A 46 F 1213 0 23 26 6 4 6 K1 2 A 4041 B 47 6 14 16 f 29 27 c 2S26 C a 6 4243 E 48 C 1117 f 7B7 3I D 27 26 A 4 6 A 44 46 A 49 C O 16 6 3234 F 79 31 C 6 B 46 8 tt M F 19 c 3S3e f 3739 0 7 A8 60 6162 C ii D 37 39 41 49 C 41 47 0 9 B 63 A 6 22 23 F 46 0 43 44 A 9 A6 64 86 A 24 e 4 e 4647 6 66 69 71 72 B 26 D 47 C O 4649 61 66 C t1 A 73 C 26 F 46 D 67 68 A 7...

Page 173: ... 8 H 4 Inguard Trsublathooting Diagram 8 H 5 The following diagrams in this group can be used to troubleshoot the Inguard section of the 3455A A troubleshooting procedure for the Inguard Outguard Transfer Cifcuitry is also included 8 81 8 82 ...

Page 174: ...4U1 U2 Q3 04 Artd Associated Co mponents The Device Select Signal At A10UI5 Pin 9 4 V Peek To Peek Troubleshoot The Iriguard Logic Circuit AtOU15 U22 U26 And Associated Components Troubleshoot The Device Select Circuit IA10U14 J26 Artd Associated Com ponents 3455 0 1 rt 8 H 3 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 13 8 83 8 84 ...

Page 175: ...3455 6 2 Figure 8 H 4 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 12 8 85 8 86 ...

Page 176: ... Circuit A10U12 U14 U26 And Associated Components Troubleshoot The Device Select Circuit IA10U16 U14 U26 And Assocleted Components Figure 8 H 5 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 1 1 3455 8 3 8 87 8 88 ...

Page 177: ...Auto Ca Circuitry TEST 10 8 89 8 90 ...

Page 178: ...3455 0 5 Figure 8 H 7 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 9 8 91 8 92 ...

Page 179: ...Figure 8 H 8 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 8 8 93 8 94 ...

Page 180: ...Troulilcshool The Logic The Device Select Troubleshoot The Logic Circuit A10U13 U22 I Sicnal At Pin 9 Of I Ab Circuit A10U12 U22 U26 And Associated Com 1 A10U12 4V 1 U26 And Associated Com ponents Peak To Peak ponents Troubleshoot The Device Troubleshoot The Device Select Circuit A10U13 Select Circuit A10U16 U14 U26 And Associated U14 U26 And Associ ated Components 3455 D 5 Figure 8 H 9 Inguard Tr...

Page 181: ...ci ated Components Troubleshoot The Logic Device Select s Troubleshoot The Logic un The 0 Sl lec S Troubleshoot The Logic Circuit A10U16 U22 1 Signal At Pin 9 Of Circuit A10U16 U22 Sional n 9 Of YES Circuit A10U16 U22 U26 And Associated Com L A10U16 4 V J U26 And Associated Com L AlOl 4V J U26 And Associaiied Com ponenis To Peak x poncnts s eal eok ponents NO Troubleshoot The Device Select Circuit...

Page 182: ...Auto Cal Circuitry TEST 5 8 99 8 100 ...

Page 183: ...Components ated Components 1 V Troubleshoot The Logic XThe Device Seleci Troubleshoot The Logic Circuit A10U13 U22 Signa t Pi n 9 Of ES Circuit A10U16 U22 U2 And Associated Com 1 A10U16 4V U26 And Associated Com poncnts sPeak To Peak ponents 3455 D a Troubleshoot The Device Select Circuit A10U13 U14 U2 And Associ ated Components NO Troubleshoot The Device Select Circuit A10U16 U14 U26 And Associ I...

Page 184: ...mponents Troubleshoot The Device Select Circuit A10U16 U14 U26 And Associ ated Components Troubleshoot The Device Select Circuit A10U16 U14 U26 Artd Associated Components 345S 0 8 Figure 8 H 13 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 3 8 103 8 104 ...

Page 185: ...Troubleshoot The Device Select Circuit AiOU16 U14 U26 ArKt Associ ated Components 3455 B 9 Figure 8 H 14 Inguard Troubleshooting Procedure Diagram Auto Cal Circuitry TEST 2 8 105 8 106 ...

Page 186: ...ts The Device Select Signal At Pin 9 Of A10UI3 4 V s ak To Realty Troubleshoot The Logic Ctrcuil A10013 022 1 U26 And Associati d Com 1 ponents 1 Ti iiubleshooi The Gate 6iis Amplifier Circuit l llOUl Q5 And Associ 31 td Components The Device Select Signal At Pin 9 Of A10U16 4 V Peak To Peak T aubleshoot The Logic Creuit A10016 022 T And Associated Com 1 pinents 1 The Device Select Signel At Pin 9...

Page 187: ...O Is Is H he Switch Driv Voltage At Pin 1 Of A10U6 Approx 1 V dc Ignore s The 2 Msec pulse The Switch Drived Voltage At Pin 14 Of A1 0U5 Approx 1 V dc Ignore s The 2 msec pulse Check Switching FET s A10Q16 021 029 031 032 038 And Associ ated Components YES YES NO NO Is Is Is Is The Gate Bias Voltage At A10TP3 Approx 1 V dc Ignore The 2 msec X pulse The Gate Bias Voltage At A10TP3 Approx 1 V dc Ign...

Page 188: ...d Outguard Transfer Circuitry Troubleshoot U26 Turn On Circuit A10U24 19 9 NOTE Thne Signah Are Difficult Tv Observe On An Oscilloscope An Alternate Method To Determine II The Signals Are 1 reseni Would Be To Use A Logic Probe Such As The lip Model I0S25T Approximately 12 msec NO Go To Outugard Trouole In Duration And 4 V P To P Present shooting Section Troubleshoot F0 Transfer Circuit A1Q9 A10U35...

Page 189: ...gling Troubleshoot The Inter rupt Circuit A10U9 19 21 24 21 28 32 And Associated Components A10R105 The Proper Value For The Voltage Marked On A10U267 2X1 V 737 kn 23V 6 04kn 3 0 V 4 75 kn 3 5 V 392 kn 4 0 V 3 32 kn 4 5 V 230 kn 50 V 2 37 kn Are The Oats Signals On Pins 18 Through 26 Of A10U26 4 Volts Peek To Paak NO Troubleshoot The I O Cir cult AlOUn 12 13 16 16 17 22 26 26 27 And Associated Com...

Page 190: ... A14 Assembly t Volts 3 V dc Troubleshoot The 10 V Detect And Absolute Value Circuits A14U5 U6 06 And Associated Components The Voltage At PinSOf TheA14 Assembly 0 Volts 3 V dc Remove The from A14C2 Troubleshoot The 0 Detect Circuit A14U6 And Associated Components Troubleshoot The 0 Detect Circuit A14U6 And Associated Components If At This Point The Problem Has Not Been Isolated To A Circuit Reche...

Page 191: ... and procedures to aid in troubleshooting the digital outguard portion of the 345SA 8 H 8 A Signature Analyzer hp Model S004A is required to perform the Outguard Troubleshooting procedures If one is not available it is suggested that the 345SA be returned to an hp Sales and Service Office for repair 8 117 8 118 ...

Page 192: ...ug From A1J7 Set All HP IB Address Switches To The 9 position down Turn The Instrument ON Proper Operation Of The Outguard Test Routine Is Indicated By A Number Or Character Being Strobed Across The Display And The Front Panel Enunci ators Being Alternately Lit NOTE The ALU Circuitry Is Working Correctly i Go To The Device Select Troubleshooting Pro cedure 3455 B I7 Figure 8 H 20 Preliminary Outgu...

Page 193: ...START Anrf STOP Inputs To A3TP2 And Check The Following Signatu res Pin Signature B 8AAF C 693A D C304 E 4F60 F C43U H 4CHH J 6C93 K 9H95 5 V CH29 Connect The Signature Analyzer START And STOP Inputs To A3TP3 And Check The Following Signatures Pin Signature B PC79 C A102 D 7AAU E OC52 F 6UAO H H8CH J 1P29 K U478 5V 02C2 I Waveforms Replace The A3 Assembly 4v Replace The A3 Assembly k To P eak Conn...

Page 194: ...2 UHUC 13 3A71 14 4FS3 U36 1 4FS3 2 F281 3 AFOP 7078V 4 UHUC F757 5 7FPH 15FU 6 184P 97C6 7 183F 8 0000 9 1PP6 10 183F 11 671 F 12 FF11 13 1UFP 14 143A 15 68P0 16 4F53 rin Signature U37 1 4FS3 2 F281 3 P6PH 3A9C 4 P961 H3FH 5 8CPA P2F8 6 PH16 62PP 7 4F53 8 0000 9 1PP5 10 4F53 11 93AF 12 U6FF 13 OHAH 14 4AC4 15 183F 16 4F53 U38 5 1PP5 8 1PP5 11 F281 12 1PP5 13 9037 U39 8 HF64 9 9037 U42 1 7822 2 P6...

Page 195: ...P6PH Go To The Device Select Troubleshooting Proced ure Turn The Instrument OFF And Carefully Remove A1U44 And U45 Turn The Instrument ON Output Buffer A1U35 Or AIU43 I Check The Signatures At The Following Points Location Signature A1U44 Socket Pin 1 93AF Pin 2 U6FF Pin 3 OHAH Pin 4 AACA Pin 5 1UFP Pine FF11 Pin 7 671 F Pin 16 143A Go To The Device Select Troubleshooting Proced ure 1 Turn The Ins...

Page 196: ... 13 FAA3 14 3S41 15 6673 16 CH29 Pin Signature U24 1 CH29 2 A81P 3 UHOl 4 17A6 5 37FH 6 FHSe 7 1 9P30 8 1 1 0000 1 9 3UFF 10 94AU 11 32UF 12 CH29 13 CH29 14 CH29 15 CH29 16 CH29 U25 1 CH29 2 6406 3 FAA3 4 3541 5 9C0F 6 150U 7 H4UF 8 0000 9 3UFF 10 3P95 11 21H1 12 CH29 13 CH29 14 CH29 16 CH29 16 CH29 U28 1 6406 2 UCH6 3 9U2A 4 3US2 5 2762 6 08U7 7 0P6P 8 6673 9 HAF7 10 8CPU 11 UPUH 12 0000 13 2131 ...

Page 197: ...U25 Pin 2 6406 Pin S 9COF Pin 7 H4UF Pin 10 3P95 Input Latch A1U25 Or ALU A1U28 I Check The Signatures At The Following Points Location Signature A1U22 Pin 2 9445 Pin 5 CPOH Pin 9 P0F9 Pin 12 F84U Check The Signatures At The Following Points Location Signature A1U31 Pin 2 5H5C Pin 5 1HHA Pin 7 59H2 Pin to 3H92 Go To The Device Select Troubleshooting Pro cedure Are These Signatures Correct Go To Th...

Page 198: ...96 The Signature At A1U32 Pin 11 02C2 A1U11 U26 Or U32 A1U35 U43 Or U46 The Signature At A1U32 Pm 4 2FPA A1U32 Or U41 The Signature Ai A1U33 Pm 11 5UH2 A1U21 U22or U33 The Signature At AlUSPin 1 4924 A1U8 U16 U16 Or U18 The Signature At AI U7 Pin 6 HC61 The Signature At A1U41 Pm 13 AC4A A1U41 U48 U54 Or U63 The Signature At A1U39 Pin 9 V BAPS Turn The Instrument OFF And Carefully Remove RAM s A1U4...

Page 199: ...ber 1 622A03538 and above or where Ser vice Note 3455A 13 has been im plemented the negative pulse is 1 5 msec wide Go To The HP IB Trouble shooting Procedure Connect The Signature Analyzer START AND STOP Input To A3TP3 One Shot Multivibrator A1U48 A1C29 A1R42 Gate A1U53 Or Decoder A1U56 Decoder A1U41 One Shot Multivibrator A1U48 Or Latches A1U54 And A1U63 6 i ec If A1 C32 is a 66 fiF capacitor Co...

Page 200: ... Slinks 3 6144 4 Probe Tip Blinks 5 A874 6 F4SA 7 PACP 9 5381 10 1P93 11 74AP 12 OPF4 13 6757 U57 1 330H 3 401F1T 4 64641 6 64641 7 64641 9 64641 14 401F11 U58 3 6464t 4 64641 6 64641 11 64641 13 6F341 U59 3 OP6C 6 2H84 8 F400 It 543C 060 3 3071 6 0478 8 55H6 11 9A99 062 1 F084 2 COA4 6 4F88 7 SHAF 9 A29F 10 904A 11 6836 12 6863 13 05A4 14 5AP6 IS P579 063 2 6757 3 CF2f 4 U65A 5 6144 6 7AAO 7 3SFA...

Page 201: ...With The Signature Analyzer Press Each Of The Remaining Keys Except The LINE And GUARD Keys rvEs Inverter A1U53 Switches S1 S6 S10 S13 S23 S28 Cable A2W2 Or A1U57 I The Signature 1 401 F When NO Is The Signature s NO Input Latch A1U51 Or The External 1 Trigger Interrupt NO The Signature s ES Inverter A1U52 Or Gates 1 Each Key Is k Pressed At A1U51 Pin 2 42AP Inverter A1 U50 1 Signature At A1U52Pin...

Page 202: ...0 4 5P30 5 7907 6 7907 7 OOFS 9 P6U5 10 9U3A 11 9U3A 13 0952 IS 709H U10 1 C5CP 2 FF71 5 9U3A 6 P6U5 8 709H 9 0952 12 925F 13 PC93 U11 1 79FU 2 5P30 3 CHC4 4 6C0P 5 9U3A 6 A43P 7 F2CA 9 8AHS 10 A8A9 11 129C 12 9H17 13 0C93 14 F517 15 C5CP Pm Sigrtaiure U12 2 F4P2 3 CH2H 4 CH2H 5 2952 6 2952 7 509H 9 P823 10 91PF 11 91PF 12 CC7S 13 390F 14 390F 15 40 F3 U13 1 9U3A 2 A8A9 3 1682 4 A8A9 5 FF71 6 7907...

Page 203: ...U10 Or Gates A1U2 Or U7 The Signature At A1U15 Pins 1 K Output Buffers A1 U1 5 And 5 And U18 Letch A1U4 Or L A1U18Pin5 00007 Inverters A1 U3 U8 Inverter A1U1 Gate A1LI7 Or Switch A1S1 Output Buffer A1U16 Letch A1U4 Inverter A1U3 Or Gate A1U7 I 1 Check The Signatures At I The Followir g Points 1 Location Signature A1U9 Pin 2 27UU Pin 7 OOFS Pin 9 P6U5 Pin 15 709H Check The Signatures At 1 The Follo...

Page 204: ...l ao ON loovAc i OX AANOes SwrCM AiAl y O DISH Ay F CU Wl ONN r f as s fi ORiVl CACJ fS P L w r DATA r ON i Kd A 4 IA IfO 3f IfAl mu ATTLs rr in DN VE AAV C WlT TAU 1 T 1 COWJECTOR IPLAR PANEL 7mA UiK iOOKA wA I MO lOWOI iMVENTgR CORV RIGHT I97G X HEWLETT PACKARD COMPANY Figure 8 H 28 Detailed Block Diagram 8 135 7 PKPUT 1 1 T ABSOLUTE S0U4P T see 1 Ml isec PARA P A2 lACe A RA 53 Set PAAA il NI AK...

Page 205: ...i gAPAtlTuR FAb ggOUPf l0 20J Vl C PUtVC 6249 202P22292 Atuw A gi 23l o cAPAiiHOH FAg grpp igo vgw ni A 28489 0160 2J06 AiUw gie vl9j 1 UPAwl lUK FxJ AAOPA gg4 A9VgC lA So289 1509334X903562 J APAvl rOA FAg avlgp eigO wA sgsVJ Ah 26489 0U0 S447 AAJL2 gt ww iuA f wapaCI Ftift F XI Jigf lgg g g gt uap 28469 0160 3447 AiVb giMV wAr vAPAiat TOA Faw guF ig4 g g tA 0249 l500l0oX902092 AWUv vft t caPauiqa...

Page 206: ...8480 1901 0090 A40CH 49U gj9tJ 010dE Slliri HlNC aov AOgNA 2N DO 7 28480 1901 0050 Ul k4 IVOi OO O OIJJE SallCHlNO 0V 2djHA 2h OU I 28480 1901 0050 AIJLK 4901 09 1 0 00 OtN HKP 49 V OHA 00 7 28480 1601 0176 AUUA 19C4 U9 A OlOJk OAN PkP AsV 90HA 00 28480 1601 02 76 Aii u U 49Q aitt OIQOA iNA 4 ZV 9X 4 0 7 PlM 9a TC OAAX 3A711 S2 I0636 242 A1 M 4 490 014 DJUJA ZNK 40 ZV 94 00 7 P0 4a I4 066 OA7I6 ii...

Page 207: ...0400 6061 7017 Aiugio 6061 7047 TKANSlSTlM FET KOVAKsF SSOOS 20400 6061 7087 AlUbif 109 0 44 i rkANSISrtK 4Ftl DUAL N U4AM U MJOE TO Tl 20400 1699 0746 AiawiA 6061 7047 TKANSISTOAe FET KOVAKSF SMO 28480 5061 7087 Aiggiy 6061 7047 TKAHStSTCM FAt KOVAASF SiOOS 20400 6061 7087 AAiM i 6061 7047 IXAVSISIllA FET KUVARSF 6 03 20400 6061 7087 A10U 1873 0420 11 TAANSISrOK 2N4S91 NKHAN O HOgE 04713 3N4391 A...

Page 208: ...IC 900 000 01121 C91045 AiNlK Qba 2U79 HLstSfUK ZK St zsa FC 1C 4007 700 01424 C820ZS 1JR 064l 6Ob9 4 Ac lS7CR 6 2A 1 250 PC tL CO0 700 01424 CB82ZS AiJK 4 do94 7ji2 2 klblXttM IH U 42S0 F C 0 100 49704 RF5Cl 9 r0 iOO4 f Al J i 6 7Ji2 AftSi ICM in 42 1250 f IC 9 400 lotoi NFSCl78 tO IOOb F Aiao 06U 949S RftSUfW S40R bt 250 FC 4 00 900 OUZl C8S18S A4JK5 U 90 6 J2J XSISIUI St IX IZSa F lc 0 ZS 03999...

Page 209: ...74H TU IS HER 012BS SN7 ISI 7 N A1UUI2 462l i496 IC ai6lfAC SR74LS174H IfL LS HER 012BS SN74L Si 74N AlOKU 1420 1496 IC OINITAL SN7ALS17AN TIL LS HEX 01295 SN74LS174N AiguiA ia 0 Ui6 IC OISITAL SH74LS41SN TU IS 3 0129S SN74L S138H AlUUi 442 1196 4 01 CITAL SN74L 174H TU LS HEX 01245 SN7 l SI 7 N Aiauio i020 4l9 IC 3lblTAL SN7ALSITAN TTL 1 HEX 01295 SN74LS174N Aigulf 444i U96 1C 31UIIAL SN7ALS1TAN ...

Page 210: ...C 063 OIODE SWITCHING BOV 200MA 2NS 00 7 TRANSISTOR 3FET DUAL N CHAN O MOOE TO 71 TRANSISTOR PNP SI PD 300MW PT I60MHZ TRANSISTOR NPN SI P0 360WW FT 7SMHZ TRANSISTOR NPN 2N3439 Si TO 6 PO 1W TRANSISTOR JFET DUAL N CHAN 0 MODE TO 71 RESISTOR no 6 39W PC TC 4007 600 RESISTOR 4 3K 6 26W FC TC 400 700 RESISTOR 1M l SW F TC 0 IOO RESISTOR 27K 6 2SW PC TC 400 8a0 RESISTOR 1 13X IK 12SW F TC 100 RESISTOR...

Page 211: ...0409 0140 3977 AliLi 0144 0202 1 C4PACIiaA FXD 13PF 3 30UMV0C PICA 72134 ON 1 SC 1 S OJ OS 00VVUA AlJkii 0i O V30 i CAPACITOH f XU lUPF 2 i 0 VK PQAC 20400 0100 3930 AllLJ J1 21 0434 2 CAP4CII0A V YAMA AJK 2 4 2483PF 330V 74970 189 S09 12S AULi JleO 3d81 2 CAPACIfOA f XO lUF 4 204 4J3VV0C HCY FA002 00710440 AliLHl 1902 447 3 DIOSE MR 23Y 88 00 7 PO l IC 4 0738 04713 SZ 10939 249 AlSLAi 1904 04 3 2...

Page 212: ...C4 4 5 f0 1002 F R SISIUk IdA S tSH FC tk a90 aU0 01121 CKU S AiilO Ao lStOk 3K b 4 b FC 7C 4yt 700 01124 C0302S Ai H9o 2 luK dOv KCSISIUk IRn 3UK Igt C sluc AUJ 17 lkN J2 T 005P 1 503 Alai j 96A3 474b Ae lblUK 47t 94 2 t Ft fC 400 4400 04421 casTis AiAAiA j4lW b b RL31SIUR 487K P 0 MATCHED SET R2S 38 t3 2 4e9 0595 5219 AAJHjy J4 W 4 02 A 5I34LW A 7 IS mld 4 F rc 0 40a 24545 ck i io ea7i F AAAA i ...

Page 213: ... RESISrtR 279 3 239 F l 9002 600 Al lUi 04 i JV25 1 RESISIOR 3 99 39 239 F K 9002 700 14MJ0 049 0440 RcsISIU I 28H 11 239 F T 0 23 A14H41 94 9a 3240 RESISIOR 699 IS I23r F I 0 I00 AlltllA 049A 3409 J ReSI KA 40 2R IS 1254 F fC 04 100 A14K4A 0490 3499 9 ISI0R 90 29 IS 1239 F U 0 100 414 94 O4 3 102 1 Rl SISKM 19 3S 239 FL IL 900 6UO A144U9 bi494 J499 RcsISlOH 90 29 IS I23 F L 0 IOO i4M4o 0693 2933 ...

Page 214: ... 8 VDC COIL 28480 0400 0683 Altai 1864 0071 TRANSISTOR NPN SI FD 30QMW PT 200MHZ 28480 1684 0071 AIKU OA 1866 0420 TRANSISTOR l FET 2N436I N CHAN O MOOE 04713 7N4361 AIIGS 1686 0063 1 TRANSISTOR 7 FET N CHAN O MOOE SI 2 460 1888 0062 Alios 1164 0071 TRANSISTOR NFN 01 FO 300MW FT 200MHI 284M 1884 0071 AIK1 1163 0020 TRANSISTOR FNF SI F1 300WW FT IIOMHl 28480 1863 0020 Altos 1166 0420 TRANSISTOR FET...

Page 215: ...S A1SR66 0663 1036 RESISTOR lOK St 2SW FC TC 400 700 01121 C81035 A15R69 0663 103 RESISTOR lOK St 3SW FC TC 400 700 01131 C8103S A1SR71 07 S7 1 RESISTOR 332 AISR72 Ag 3100 3122 3 RESISTOR TRMR 100 lOt C TOP 03744 3006P 1 101 A1 R73 2100 3066 RESISTOR THMA 5K lOK C SlOE AOJ 17 TRN 01885 43 02 A1Bfl74 2100 3306 RESISTOR TAMR 50K lOK C SlOE AOJ 17 TRN 33997 3006P 1 fi03 A1BR7S Ag 2100 3154 1 A6SISTOR...

Page 216: ... 16 0 15 P 23 29 E 38 c 8 c 17 A 16 17 8 JM1 2 f 3142 F 39 4144 0 9 D 18 19 6 18 19 21 23 C 3 0 33 36 6 45 E 11 c 21 22 A 23 t 3749 A 46 P 1M3 0 23 26 8 24 6 K J A 4941 6 47 6 14 16 E 26 27 C 26 26 c 3 8 4243 E 48 C 16 17 P 28 29 31 0 27 28 A 45 A 4445 A 49 C 0 18 B 3244 E 29 31 c 6 B 46 6 61 58 p 19 c 3 36 F 3749 0 7 A8 59 61 62 c 21 D 3749 41 49 c 4142 0 a 6 63 A B 22 23 F 4 D 4344 A 9 A e 64 6 ...

Page 217: ......

Page 218: ...INPUT A13 03455 66513 Rev A Aa For serial numbers 1622A02436 and above The preferred value for C25 was changed from part number 0160 2150 33 pFI to improve frequency response near 10 kHz ...

Page 219: ...C iWiGHT 1976 b HEWI Err RaOOJRO CCMiUNr Figure 8 H 30 Average Responding AC Convertor Schematic 8 149 8 150 ...

Page 220: ...to 100 kn R25 from 25 kn to 100 kn R51 from 100 n to 200 n R52 from 10 kn to 20 kn R53 from 5 kn to 10 kn These changes have been made on instruments with Serial No s 1 622A051 1 and greater Serial numbers 1622A01000 and above Replaces 0757 0417 562 Q to Increase the zero ad justment range Serial numbers 1622A01806 and above replaces 5080 9080 The new part Is not hand selected Serial numbers 1622A...

Page 221: ...0C 7S2K e 67 VDC AT PULL SCALS Cl 20p PULL SCALE NDU7 AT lOOfZ ROOT CAr 732R i 4Vp 9 OOM PULl SCALE iNROT 2d P FOOK iCHa 4 v SH NV NR4 S320 P 9ffV lOOV MRl uo R93 20 H iPCpf jMPh 5 p nCM UiTIftl lOV hM4 FBCV unc l Figure 8 H 31 True RMS AC Convertor Schematic 8 151 8 152 COP i5 T 1976 HE ETT ftiC 4At COWFA ...

Page 222: ...f resietors R7 R8 R16 and R17 have been changed from 4 99 kO to 10 kO to properly bias differential amplifiers Q1 and Q5 These changes have been mads on instruments with Serial No s 1622A01056 and greater Ab The value of resistor R7 R6 R1 6 R1 6 have been changed from 10 K 0757 0442 to 4 99 K 0698 3279 end C3 has been changed from 039 0160 0164 to 0047 fiF 0160 01671 to eliminate first readirtg er...

Page 223: ......

Page 224: ...v B A Serial Numbers 1 622A01 6956 and above A20 replaces all part number 03455 6651 1 Aa Serial numbers 1622A02106 and above replaces 0160 0820 05 LlF as frequency compensation to supress U2 Oscillations A0 Replaced with A20 assembly only for serial numbers 1622A05871 and above 8 155 ...

Page 225: ......

Page 226: ...CO ftiGHT I9 7 BY PACKARD CCAfOMY J 4i4lA ...

Page 227: ......

Page 228: ...a tor from oscillating Instruments with Serial No s 1622A01056 and greater have this change incorporated 6 Serial numbers 1 622A05231 and above the following component changes have been made to improve reliability of A1 0U1 5 Old Pert No R1 06B3 4335 5 1 K1 R18 0757 0435 3 92 K1 R19 0757 0421 8261 R20 0757 0442 10 KJ CR2 1901 0040 CR6 1901 0040 ...

Page 229: ...COPyPlOHT 1976 er hcwlett packaro company ...

Page 230: ...ua HO 4HD 1 0 B C E 03455 6510 Rev C A10 Component Locator Tftbla ...

Page 231: ...3499 66510 lO TOUARO StOTHFR BOARD 05455 66S0I CONTROL LiN 3 TDRN ON POWER UP I I JAt6 U3SA TO 0 10 111 NTCRRyPt PROM UNCtroKU R9 psy vk MASTER CLOCK 0 9 LATCH CLK POR 60 b SETTINO 016 LATCH UIA LATCH NVCATED 4M4v MRANY SMB ...

Page 232: ... from 2 2 iF to 22 fiF to eliminate double entry of front panel keys C46 applies to serial numbers 1 622A01 506 and above C46 serves to reduce turn on noise causino false Interruots A1 Component Locetoi TeM DDQGODQQDODQODDDDDGDDDODDDOn ...

Page 233: ...COPYRIOMT 1976 BY HEWLETT PACKARD COWPANY ...

Page 234: ...DODODDDQDDDDDDDDQDODOODDDOIID ...

Page 235: ......

Page 236: ...ponents change the 03455 66501 assembly from Rev C to Rev D This change has been made on instruments with Serial No s 1622A01506 and greater A1 Componsnl Locitoc TiM A2 03455 66502 Rev A Co nooi VRi Col CofTipcn f t Col Con pon il Col CompoA it Col Comooflort Col Componont Col ci A CRI 6 J1 A Q1 2 A R1 7 A U1 6 A 6 9 B 29 c 2 6 C 34 e 69 B 6 11 8 11 12 B IM3 0 3 B 76 6 17 19 A 12 26 C 13 14 C I4 1...

Page 237: ...CC H rt P CMAO COMMMY 1113 Figure 8 H 38 Front Panel Assembly 8 171 8 172 ...

Page 238: ......

Page 239: ...HI ...

Page 240: ...ITOA FXO 1UF 3SVDC TA 66289 1900106X909 A7 A1C43 A Qfi0 0 t CAFAC TOA FXO 1UF 3SVOC TA 04200 1900I06X909SA2 A1CM Ac 0tt0 t701 CAFACITQA FXO 6JUF 20 6VOC TA 04200 I500685X0006A7 AiWMt yy PIUn F sM fctu low 4 9A 0474 SA1644 9 AlwiU lvyi y yy P4Jy FyH k CT IPOV l VA 04713 SXl 646 9 4y C4 yv A PI0y HlT h MM yv dpyiu yu f 2 4 0 19W1 0050 A1CK4 4 Vb4 vw y p pyC S lfCHi c yy 2yyHi JCr 7 26460 1901 0959 A...

Page 241: ... F AirtA 0797 0 i 0 UblStCR IK 11 129 P rc JP lJO 24946 C4 1 8 ro IOOl F AiHiS 07S7 V4A4 6 AeSIStCA lOK 14 1290 F rC 0P 103 24946 6 l a TO l002 F AlAjft U7i7 UAA HcalSTOl 2K It 1 90 P fb de lOO 24946 C4 l e TO 2301 F A A 7 i 797 o i HPblStOH 2R It I2S0 P 1t J 100 24946 C4 I 8 70 2001 F A1 M J797 U OJ fUalSICW 2R it 1290 f TC 3P 100 24946 C6 l a T0 290l F AlAi9 07 7 l KaSISI 2R 1a 126H F Ka0 10O 24...

Page 242: ... SN79LS79N A4JA4 I02kj U1A IC JlGltAL fa irALfal38 m LS 9 0129 SN74LS130N AlJ 48 4 4S K 3lg tAl faNIAL 429N TU LS gOAO 1 80S 01299 SHT41S12 N Al J i l0 2kH IbOA Il OIGIUI SHrHSI2SN IIL IS O0 0 1 BUS 0129 SN79LS129N AiJA i fa 18 01 99 2 1C AN9112A U 8AM NHJi 3 33 4H9112XPC AiJA 4 18 0199 ib AM9442AK 48 RAM N Oa 1A33S AN9412AK A J H 1 20 4 V l DISIIAl SHTHSOSN IIL LS OOAU i NMO 04299 SN79LS05N klotT...

Page 243: ... ViSlM E LUI INT 2nL0 F 20IU UX 20400 1990 0647 A CtUi 199 0 47 LIO VISIOU L0 iNf 2 U F 20MA HAX 20400 1990 0647 1990 0947 LfcO VtSlOLfc tO INI 2MCi Fe20MA HAI 20400 1990 0647 A2CHA3 19 9k 094 7 LtO VJ IALC LUn lNTa2MCJ 1F 20RA HAX 20400 1990 0647 A2lrA V l99 0 9r LfcO VISIBlE LUH iNT 2HC0 IF 20HA HAX 26963 1690 0397 A2i K3 1990 0947 LlJ VlSlftlE LUM INT 2MC0 1X 20MA IUX 20400 1990 0647 A2 1 1990 ...

Page 244: ...196l P 0l 9a A7 i KcSUlUa I 37A 14 129M F IC 0 10 O SV 24S60 C4 l t TU l971 F u7 r o u R IStUR IK 14 U l F tC IOa OilVI 2i 46 C4 I 8 7O I0OI P i Va 17gu i KESlStGR 719 14 179k F 7C 04 100 Q SVI 24360 C4 l a T0 n9R F 0797 U l 1 tiisrut 911 It izsk F rt w4 ioua ovi 26560 C4 178 T0 911R P 4iJi l OlulIAL H7 190 H 1 7L t WJAJ 7 ANU 01255 9N741908N 43Ja 144 U4I It alkItAt 1N74L900H TIL t9 MAl 7 AND 0129...

Page 245: ...ogram example the 345SA is set up to take SO readings quickly with Auto Cal ofQ and stores them into an Array Each reading is printed out after all the readings have been taken The 34SSA is then set back to the Auto Cal mode to insure accuracy The programs in this example perform basically the same functions using different languages The first program in this example is written in the HP Basic lan...

Page 246: ... Loop Trigger DVM GET ENTER Dm I Vo 1 Index T 1 Enter the Reading into Variable NEXT Index OUTPUT Dyfi Complete For Next Loop F I XED 6 Auto Cal on to Maintain Accuracy MRT PRINT Vo 1 t g gi Format the Array END Print the Entire Array Ends the Program Note Refer to Controiler Manuai for Explanation of Option Base A 5 Program Example H2 When the 3455A is in the Binary mode another feature called th...

Page 247: ...U6 FORMRT 3B OUTPUT 13 250 256 8 5 CND FORMAT F13 6 ENTER 13 280 0 FOR 1 1 TO 10 FORMRT F13 5 NRITE 15 310 RC NEXT I PRINT FORMRT F13 0 R NRITE 15 350 C PRINT PRINT CMD YUe FORMRT SB OUTPUT 13 400 256 4 oj END 12 Begin For Next Loop Address OVM to Listen Controller to Talk Format the Output Trigger the OVM GET Set OVM to Talk Format the Output Iresdingl Enter the Output of the OVM into Variable Co...

Page 248: ...F1 Hotd Manual ITS High Reaolution ff HOI Scale Ml 10 V Range RSI and Binary Program 8 Reformat to TurtvOn Cor dition Entire Birtary Charactara into String Set up DVM to ACV IF3I Math OH IMS and Autorange IR7 Begin For Next Loop Trigger the DVM GET nter Output of DVM to Variable omplete For Next Loop ormat Output Local Controllar Operation without DVM Set up DVM to Binary Information in String Tri...

Page 249: ...F3M3R7 2 o FOR Index l TO ____J Ent Binary character ntoStr ng TRIGGER P II Set DVM to ACV F3 Math Off MU and Auiorange IR7 ENTER fli lpl ilude Index Begin For Ne t Loop NEXT Index Locol operation FOR J 1 TO 50Y e Output of dvm into variable I V Complete For Next Loop NEXT J i Local Controller Operation without OVM OUTPUT Dui i 5 B Bi no ry Set up DVM to Binary information in String TRIGGER Dwr l ...

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