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HP 974A Multimeter

Table of Contents

Safety Summary . . . . . . . . . . . . . . . 1-4

Safety Symbols  . .  . .  . .  . .  . .  . .  . .  1-4
Maximum  Overvoltage  Limitations  .  .  .  1-5
Probes and Test Leads  .  .  .  .  .  .  .  .  .  1-6

Operation . . . . . . . . . . . . . . . . . . . 1-7

Terminals, Shutter,  & Test  Leads  .  .  .  1-7
Function Switch  . .  . .  . .  . .  . .  . .  . .  1-8
Function Keys  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1-9
Function Keys/Function Switch Matrix  .  .  1-12
Display  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1-13
Audio  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  1-13

Calibration and Adjustment . . . . . . . . 1-14

Required Test Equipment . . . . . . . . 1-14
Calibration Procedure . . . . . . . . . . 1-14

Maintenance . . . . . . . . . . . . . . . . . 1-15

Battery Replacement  .  .  .  .  .  .  .  .  .  .  .  1-15
Fuse Replacement  . .  . .  . .  . .  . .  . .  1-15
Troubleshooting  . .  . .  . .  . .  . .  . .  . .  1-16
Cleaning  . .  . .  . .  . .  . .  . .  . .  . .  . .  1-16
Replaceable  Parts/Accessories  .  .  .  .  .  1-16

Specifications . . . . . . . . . . . . . . . . 1-17

General  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1-17
DC Voltage  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1-17
AC Voltage   . .  . .  . .  . .  . .  . .  . .  . .  1-17
AC + DC Voltage   .  .  .  .  .  .  .  .  .  .  .  .  .  1-18
DC Current, AC Current   .  .  .  .  .  .  .  .  .  1-18
Resistance  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1-19
Continuity  . .  . .  . .  . .  . .  . .  . .  . .  . .  1-19
Diode  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  1-19
Frequency (AC Coupled)  .  .  .  .  .  .  .  .  .  1-19
Temperature   . .  . .  . .  . .  . .  . .  . .  . .  1-20
dBm   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1-20

Adjustments . . . . . . . . . . . . . . . . . 6-1

Calibration Table . . . . . . . . . . . . . . . 6-2

Replaceable Parts/Accessories . . . . . . 6-4

Disassembly . . . . . . . . . . . . . . . . 6-5

Declaration of Conformity

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Summary of Contents for 974A

Page 1: ...HP 974A Multimeter User s Guide Part Number 00974 90002 March 1995 ...

Page 2: ......

Page 3: ...ion and Adjustment 1 14 Required Test Equipment 1 14 Calibration Procedure 1 14 Maintenance 1 15 Battery Replacement 1 15 Fuse Replacement 1 15 Troubleshooting 1 16 Cleaning 1 16 Specifications 1 17 General 1 17 DC Voltage 1 17 AC Voltage 1 17 AC DC Voltage 1 18 DC Current AC Current 1 18 Resistance 1 19 Continuity 1 19 Diode 1 19 Frequency AC Coupled 1 19 Temperature 1 20 dBm 1 20 Adjustments 6 1...

Page 4: ...on when using the current function do not leave one probe connected to the circuit under test and the other probe disconnected exposed and readily accessible touchable Safety Symbols Indicates the operator must refer to an explanation in this manual Indicates terminals at which dangerous voltages may exist WARNING TO AVOID ELECTRICAL SHOCK or damage to the multimeter do not apply more than 1000 Vd...

Page 5: ...oltage Limitations AC and DC Voltage Functions 1000V MAX indicates the maximum voltage between input terminals and earth is 1000 V dc or ac rms Do not use the multimeter on any ACV circuit where the maximum impulse overvoltage may be more than 4000Vpk or any DCV circuit where the maximum impulse overvoltage may be more than 2500Vpk between the COM and VOLT terminals Excessive impulse overvoltage c...

Page 6: ...leads whose insulation has cuts cracks or other damage that may result in reduced electric shock protection 2 Keep insulation surface clean between the probe tip connector and the finger guards 3 If probes other than the ones specified are to be used with the multimeter be sure the probes and their leads are rated for the voltage and current to which they will be subjected Do not exceed the voltag...

Page 7: ...age Diode Resistance Frequency Temperature dBm and Continuity Measurements SAFETY SHUTTER Slide up to open shutters for current measurement inputs Must have the function switch in one of the Current Measurement positions to open shutter Close shutter to change function switch to any other measurement function ...

Page 8: ...rrent 10 µA to 0 5 A 50 mA DC Current 1 µA to 0 05 A AC Current 1 µA to 0 05 A 500 µA DC Current 0 01 µA to 0 5 mA AC Current 0 01 µA to 0 5 mA Diode Test Auto Diode Test Ω Resistance 0 01 Ω to 50 MΩ Continuity alarm at 100 Ω Temperature in F 112 F to 302 F Temperature in C 80 C to 150 C mV DC Millivolts 10 µV to 500 mV Operation ...

Page 9: ...holding key for 2 seconds while applying power Relative Percent Press Action Main Display Secondary Display Makes the displayed measurement the reference Each measured value relative to the reference value difference Range Calculates the percentage change from the reference Each measured value as a percent change of the reference value Range Cancels the Relative function Measurement value Range Op...

Page 10: ...ecording of minimum and maximum values Each measured value Elapsed time Press and hold 1 second to cancel 1 Automatic power off is disabled when Min Max is selected 2 Time is recorded and displayed in minutes and seconds up to 99 59 After 99 59 time is recorded and displayed in minutes up to the maximum recording time of 1999 minutes Recording will stop at the maximum time 3 Average is computed fr...

Page 11: ...ment circuit will display and hold the last stable reading Range Press Action Main Display Secondary Display Changes from auto ranging to manual ranging Measurement value Range Change manual range UP once with each keypress 1 Measurement value Range Returns to auto ranging when key is held for 1 second Measurement value Range 1 When upper range is reached the sequence begins again at the lowest ra...

Page 12: ...n Max 3 Average Data Hold Auto Hold Range µA mA 10A µA mA 10A Ω 1 F C mV V V Hz Hz V 2 dBm 1 Invokes zero adjust when display is less than 99 2 Changes input attenuator frequency is always auto range 3 Secondary display shows elapsed time in seconds and minutes Operation ...

Page 13: ...beeps Indicates wrong input terminals used for function selected Indicates an overload condition at the measurement terminals Continuous tone Indicates a resistance of 100 Ω when using the Continuity function Low Battery indicator Replace batteries when on Secondary Display Shows Range most functions except for Elapsed time Min Max Main Display Not all annunciators shown Number of digits is set by...

Page 14: ...2 Install new batteries described below and close the cover Turn the multimeter on and allow a 30 minute warm up Open the case 3 Set the multimeter function and range and the source output to the values specified at each step in the calibration table on page 6 2 4 When appropriate make the adjustments indicated in the calibration table to bring the multimeter display within the limits CAUTION Dang...

Page 15: ...r before calibration Replace both batteries at the same time Use high quality type AA alkaline IEC LR6 batteries Remove the batteries if the multimeter is to be stored for extended periods of time Refer to the disassembly drawing on page 6 5 Fuse Replacement Fuse locations are shown in the diagram on page 6 5 Fuses are listed in the replaceable part list on page 6 4 CAUTION For continued protectio...

Page 16: ...put limit exceeded Remove test leads and press any key to reset Battery Annunciator on Low battery voltage Replace batteries Unable to measure current 10 A or mA µA Blown input protection fuse Replace fuse s Cleaning Wipe instrument with a soft rag dampened with soap and water Do not immerse in water Do not use chemical cleansers or solvents Replaceable Parts Accessories Refer to the disassembly d...

Page 17: ...ely 2 4 times second Display rate for frequency measurements Approximately 1 times second Battery life Approximately 120 hours on DCV DC Voltage Range Resolution Accuracy Input Resistance 500 mV 10 µV 0 05 2 1000 MΩ 5 V 100 µV 11 MΩ nominal 50 V 1 mV 10 MΩ nominal 500 V 10 mV 1000 V 100 mV Normal Mode Rejection Ratio NMR 60 dB 50 or 60 Hz Effective Common Mode Rejection Ratio CMR 1 kΩ imbalance 12...

Page 18: ...Hz to 30 kHz 5 to 100 of range 30 kHz to 100 kHz 10 to 100 of range 750 V range 75 V to 750 V Response time 2 seconds for AC 5 seconds for AC DC on fixed range Crest factor 3 Common Mode Rejection Ratio CMR 1 k Ω imbalance 60 dB DC to 60 Hz DC Current AC Current 40 Hz to 1 kHz 5 to 100 of range Range Resolution DC Current Accuracy AC Current Accuracy Input Resistance Maximum Input 500 µA 10 nA 0 3...

Page 19: ...o 50 MΩ 10 seconds Continuity Measurement Current 0 8 mA maximum Open circuit voltage 5 5 Vpeak Displayed resistance 0 Ω to 499 99 Ω Input protection 500 Vrms sinewave Alarm Tone when input 100 Ω 50 Ω Resolution 10 mΩ 100 mSec response time Diode Measurement current 1 0 mA nominal 0 6 V Open circuit voltage 5 5 Vpeak Displayed Voltage 0 V to 4 999 V Input protection 500 Vrms sinewave Accuracy 1 2 ...

Page 20: ... 10 kHz to 30 kHz 30 kHz to 50 kHz 50 kHz to 100 kHz 29 82 dBm to 23 80 dBm 25 mV to 50 mV 0 2 dBm 0 50 dBm Not specified 23 80 dBm to 3 80 dBm 50 mV to 499 99 mV 0 15 dBm 0 30 dBm 3 80 dBm to 55 28 dBm 0 5 V to 450 00 V 0 10 dBm 0 20 dBm 0 5 dBm 1 00 dBm 55 28 dBm to 59 72 dBm 450 V to 750 V 0 15 dBm to 1kHz Not specified Dynamic range 59 94 dBm to 59 72 dBm 0 8 mV to 750 V Accuracy not specified...

Page 21: ...Adjustments ...

Page 22: ...ment limit Tolerance counts 1 500 mV 500 mV Short 2 2 480 0 mV 1 2 26 3 480 0 mV 26 4 V 50 V 48 000 V 2 2 26 5 48 000 V 26 6 5 V 4 800 V 3 2 26 7 500 V 480 00 V RV4 2 26 8 1000 V 1000 V RV5 1 7 9 V 5 V 4 8000 V 200 Hz 6 10 270 10 0 2500 V 200 Hz 7 5 42 11 500 mV 480 0 mV 200 Hz 8 10 366 12 500 V 480 00 V 10 kHz C1 20 270 13 480 00 V 100 kHz 1740 14 480 00 V 200 Hz 270 15 5 V 4 8000 V 10 kHz C2 20 ...

Page 23: ...adjust 1 1 23 480 00 Ω 9 5 30 24 5 kΩ 4 8000 kΩ 30 25 50 kΩ 48 000 kΩ 30 26 500 kΩ 480 00 kΩ 30 27 5 MΩ 4 8000 MΩ 242 28 50 MΩ 48 000 MΩ 482 29 500 µA 500 µA Short 2 30 480 00 µA 146 31 50 mA 50 mA 48 000 mA 146 32 500 mA 40 mA 480 00 mA 146 33 10 A 10 A 10 000 A 10 10 72 34 500 µA 500 µA 480 00 µA 200 Hz 500 35 50 mA 50 mA 48 000 mA 200 Hz 500 36 500 mA 500 mA 480 00 mA 200 Hz 500 37 10 A 10 A 10...

Page 24: ...ture seal 00971 64403 MP3 Bottom case assembly includes stand 00974 64402 Rubber Boot 00971 86001 Replacement Test Leads 2 pair E2305A Temperature probe 5 KΩ Thermistor E2308A Surface temperature sensor Thermistor 0 1 C 12 lead requires dual banana plug 40653B Soft Case fits meter with rubber boot E2304A Operator protection from electric shock hazard is provided by a double insulated enclosure Ref...

Page 25: ...Disassembly WARNING Always disconnect the test leads before opening the case Replaceable Parts Accessories ...

Page 26: ...ing Product Specifications Safety IEC 1010 01 1990 Incl Amend 1 1992 EN61010 1993 CSA C22 2 1010 1 1992 UL 1244 EMC CISPR 11 1990 EN55011 1991 Group 1 Class A IEC801 2 1991 EN50082 1 1992 4 kV CD 8 kV AD IEC 801 3 1984 EN50082 1 1992 3 V m IEC 801 4 1988 EN50082 1 1992 0 5 kV Signal Lines Supplemental Information The product herewith complies with the requirements of the Low Voltage Directive 73 2...

Page 27: ... LIMITED TO THE THREE YEAR DURATION OF THIS WRITTEN WARRANTY Some states provinces or countries do not allow the exclusion or limitation or incidental or consequential damages so the above limitation or exclusion may not apply to you The warranty gives you specific legal rights and you may also have other rights which vary from state to state province to province or country to country Service Hewl...

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