Related Manuals for HP 974A
Summary of Contents for HP 974A
- Page 1 HP 974A Multimeter User’s Guide Part Number 00974-90002 March 1995 © Copyright Hewlett-Packard Company 1994, 1995 All Rights Reserved...
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Page 3: Table Of Contents
HP 974A Multimeter Table of Contents Safety Summary ....1-4 Specifications ....1-17 Safety Symbols . -
Page 4: Safety Summary
Safety Summary The CAUTIONS and WARNINGS which appear on the following pages must be followed to ensure operator safety and to retain the operating condition of the Multimeter. 1. Do not use this product beyond its specifications or for uses not intended for this product as identified by the product functions, ranges, and hazards as indicted below. -
Page 5: Maximum Overvoltage Limitations
Safety Summary WARNING POSSIBLE ELECTRICAL SHOCK. Calibration and performance tests are to be performed by qualified personnel only. Do not attempt calibration or test procedures unless qualified to do so. CAUTION To avoid damage to the multimeter for inputs above 250 Vdc or Vac, disconnect the test leads before changing functions. -
Page 6: Probes And Test Leads
Safety Summary Function Maximum Operating Input ± 10 A (dc or ac rms) / 600 V 10 A mA or µA ± 500 mA (dc or ac rms) / 250 V Resistance, Diode Test, 500 V (dc or ac rms) Temperature, Continuity Frequency (10 Hz to 9.999 kHz) -
Page 7: Operation
Operation Terminals, Shutter, & Test Leads 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: Function Switch
Operation Function Switch Switch Display Position DC Current AC Current (1 mA to 10 A) (1 mA to 10 A) DC Current AC Current 500 mA (10 µA to 0.5 A) (10 µA to 0.5 A) DC Current AC Current 50 mA (1 µA to 0.05 A) (1 µA to 0.05 A) -
Page 9: Function Keys
Operation Function Keys Power Automatic power off after 30 minutes. Alarm sounds 30 seconds before automatic power off. Press any key or change any function to cancel automatic power off. Defeat automatic power off by holding key for 2 seconds while applying power. Relative/Percent Press Action... - Page 10 Operation Minimum/Maximum Press Action Main Display Secondary Display Begin recording of min, max, and avg Each measured value Elapsed time values Display recorded maximum Maximum measurement Time of Maximum Display recorded minimum Minimum measurement Time of Minimum Display recorded average Calculated average Elapsed time Display last recorded measurement...
- Page 11 Operation Hold/Auto-Hold Press Action Main Display Secondary Display Holds the measurement value in the Measurement value when Range display hold pressed Enters Auto-Hold function Input value Range Cancels Hold function Measurement value Range Auto-Hold Operation. When measurement becomes stable, multimeter will beep and save the stable reading.
- Page 12 Operation Function Keys and Function Switch Matrix Function Relative Min/Max Average Data Hold Auto-Hold Range (Percent) • • • • • • µA, mA, 10A • • • • • • µA, mA, 10A • • • • • • •...
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Page 13: Display
Operation Display Low Battery indicator Replace batteries when on. Secondary Display Shows: Range (most functions) except for Main Display Elapsed time (Min/Max) (Not all annunciators shown) Number of digits is set by range and function Displays O.L to indicate an overload condition Entire display flashes if input overvoltage Audio Power on... -
Page 14: Calibration And Adjustment
Calibration and Adjustment Required Test Equipment The source used for the calibration should have an output accuracy as good or better than that listed in the specifications. Calibration Procedure Environmental range for calibration: 23° C ± 5° C, < 80% RH Calibration interval: 6 Months Disconnect all inputs from the multimeter and open the case as described on page 6-5. -
Page 15: Maintenance
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 protection use only the specified manufacturers part number or HP part number fuse for replacement purposes. 1-15... -
Page 16: Troubleshooting
Maintenance Troubleshooting Problem Possible Cause Suggested Action Unit won’t turn on Dead Batteries Replace batteries Unit won’t turn off Input limit exceeded Remove test leads and press any key to reset. Display flashes and Rapid Input limit exceeded Remove test leads and press any key to reset. beeps Battery Annunciator on Low battery voltage... -
Page 17: Specifications
Specifications Calibration period: six months minimum. Specifications apply at 23°C ± 5°C, < 80% RH Accuracy = ± (% of reading + number of digits) Temperature Coefficient = Accuracy 0.1/° C (0° C to 18° C; 28° C to 55° C) General Do not expose product to moisture or rain. -
Page 18: Ac + Dc Voltage
Specifications AC + DC Voltage (rms responding, computed from acV, dcV) Accuracy Range Resolution DC, 20 Hz to DC, 10 kHz to DC, 30 kHz to DC, 50 kHz to 10 kHz 30 kHz 50 kHZ 100 kHz 1 mV ±... -
Page 19: Resistance
Specifications Resistance Range Resolution Accuracy Test Current Open Circuit Voltage 500 Ω ± (0.06% + 2) 10 mΩ < 800 µA < 5.5 V 5.0 kΩ 100 mΩ ± (0.06% + 2) < 80 µA 50 kΩ 1Ω 10 Ω <... -
Page 20: Temperature
Specifications Temperature (5 kΩ @ 25°C Thermistor probe) °C °F Measurement Range -80° to 150° -112° to 302° Resolution 0.1° 0.1° ± 0.2° ± 0.4° Accuracy Accuracy does not include 5 k Ω Thermistor error dBm 600 Ω 1 mW reference (rms responding, computed from AC Voltage) Accuracy Input dBm Input Voltage... -
Page 21: Adjustments
Adjustments... -
Page 22: Calibration Table
Calibration Table CAUTION Dangerous voltages are present during the calibration procedure. Calibration should only be performed by qualified service technicians using a non-conductive tool. Adjustment Tolerance Step Function Range Input Signal (limit) (counts) ±2 Short — ±26 500 mV 480.0 mV 500 mV 1 (±2) ±26... - Page 23 Calibration Table Adjustment Tolerance Step Function Range Input Signal (limit) (counts) ±270 48.000 V @ 10 kHz C3 (±20) ±1740 50 V 48.000 V @ 100 kHz — ±270 48.000 V @ 200 Hz — ±366 500 mV 480.00 mV @ 10 kHz —...
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Page 24: Replaceable Parts/Accessories
Replaceable Parts/Accessories Refer to the disassembly diagram on page 6-5. Call out Description HP Part Number Fuse, 500 mA, 250 V fast blow Littlefuse 216-500 2110-0940 DO NOT SUBSTITUTE Fuse, 15 A, 600 V fast blow Littlefuse KLK15 2110-0941 DO NOT SUBSTITUTE... -
Page 25: Disassembly
Replaceable Parts/Accessories Disassembly WARNING Always disconnect the test leads before opening the case. -
Page 26: Declaration Of Conformity
Manufacturer’s Name: Manufacturer’s Address: 815 14th Street S.W., Loveland, Colorado 80537 U.S.A. declares, that the products Handheld Multimeter Product Name: HP 971A, HP 972A, HP 973A, HP 974A Model Number: Product Options: None conforms to the following Product Specifications: Safety: IEC 1010-01 (1990) Incl. - Page 27 Limited 3 Year Warranty What is Covered The HP 974A Multimeter is warranted by Hewlett-Packard against defects in materials and workmanship for three years from the date of original purchase. If you sell your unit or give it as a gift, the warranty is automatically transferred to the new owner and remains in effect for the original three year period.