HP 971A Manual de usuario

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This manual may contain references to HP or Hewlett-Packard. Please note that

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made no changes to this manual copy. In other documentation, to reduce

potential confusion, the only change to product numbers and names has been in

the company name prefix: where a product number/name was HP XXXX the

current name/number is now Agilent XXXX. For example, model number

HP8648A is now model number Agilent 8648A.

HP 971A Multimeter

User’s Guide

Part Number 00971-90002

March 1995

HP 971A Multimeter

Table of Contents

SafetySummary. .. .. .. .. .. .. .. 1-4

SafetySymbols . .. .. .. .. .. .. .1-4

Maximum Overvoltage Limitations...1-5

ProbesandTestLeads. .. .. .. .. 1-6

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

Terminals,Shutter, & Test Leads...1-7

FunctionSwitch . .. .. .. .. .. .. .1-8

FunctionKeys. .. .. .. .. .. .. .. 1-9

Function Keys/Function Switch Matrix ..1-12

Display. .. .. .. .. .. .. .. .. .. 1-13

Audio . .. .. .. .. .. .. .. .. .. .1-13

CalibrationandAdjustment . .. .. .. .1-14

RequiredTestEquipment . .. .. .. .1-14

CalibrationProcedure . .. .. .. .. .1-14

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

BatteryReplacement. .. .. .. .. .. 1-15

FuseReplacement . .. .. .. .. .. .1-15

Troubleshooting . .. .. .. .. .. .. .1-16

Cleaning . .. .. .. .. .. .. .. .. .1-16

Replaceable Parts/Accessories ....1-16

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

General. . . . . . . . . . . . . . . . . . . 1-17

DCVoltage. . . . . . . . . . . . . . . . . 1-17

ACVoltage. .. .. .. .. .. .. .. .1-18

DCCurrent. . . . . . . . . . . . . . . . . 1-18

ACCurrent. .. .. .. .. .. .. .. .1-19

Resistance. . . . . . . . . . . . . . . . . 1-19

Continuity . .. .. .. .. .. .. .. .. .1-19

Diode . .. .. .. .. .. .. .. .. .. .1-20

Temperature. . . . . . . . . . . . . . . 1-20

Frequency. . . . . . . . . . . . . . . . . 1-20

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

CalibrationTable. . . . . . . . . . . . . . . 6-2

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

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

DeclarationofConformity

1-3

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.

2. To minimize possible electric shock hazard condition, connect only two leads at any one

time to any of the multimeter terminals.

3. To prevent possible electric shock hazard condition 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 Vdc or 1000 Vrms between any terminal and earth ground. Use caution when working with

voltages above 60 Vdc or 42 Vpeak. Ensure test leads are in good condition.

WARNING

POSSIBLE ELECTRICAL SHOCK. Do not make measurements if the case is damaged or the

rear cover is removed. Remove all electrical inputs before removing the rear cover.

WARNING

POSSIBLE ELECTRICAL SHOCK or FIRE HAZARD. Do not expose this multimeter to rain or

moisture. Do not operate the multimeter in the presence of flammable gases or fumes.

1-4

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. Do not exceed the maximum input limits.

Maximum Overvoltage 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

can damage the multimeter voltage functions. Do not measure branch circuits (CAT 11) over

600V to earth or service panel circuits (CAT III) over 300V to earth.

Safety Summary

1-5

Function Maximum Operating Input

10 A ±10 A (dc or ac rms) / 600 V

mA or µA±500 mA (dc or ac rms) / 250 V

Diode Test, Resistance

Continuity, Temperature 660 Vrms (sinewave)

Frequency 660 Vrms (5 Hz to 10 kHz)

100 Vrms (10 kHz to 100 kHz)

V ±1000 Vdc or Vrms (sinewave)

Probes and Test Leads

1. Always inspect probes before use. Do not use test 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 voltage ratings for the multimeter.

4. Probes supplied with this multimeter are rated for use up to 1000Vrms or Vdc.

Safety Summary

1-6

Operation

Terminals, Shutter, & Test Leads

RED LEAD

Current Measurements

(0 A to 10 A)

RED LEAD

Current Measurements

(0 to 400 mA)

BLACK LEAD

COMMON

ALL Measurements

RED LEAD

DC & AC Voltage,

Diode, Resistance, Frequency,

Temperature, 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.

1-7

Function Switch

Switch

Position Display

10A DC Current

(10 mA to 10 A) AC Current

(10 mA to 10 A)

mA DC Current

(10 µA to 0.4 A) AC Current

(10 µA to 0.4 A)

µADC Current

(0.1 µA to 4 mA) AC Current

(0.1 µA to 4 mA)

Diode Test

(0 to 2 V) Auto Diode Test

( 0 to ±2 V)

ΩResistance

(0.1 Ωto 40 MΩ)Continuity

(alarm at < 20 Ω)Temperature in °F

(-112°F to 302°F) Temperature in °C

(-80°C to 150°C)

Hz Frequency

(5 Hz to 99.9 kHz)

mV DC volts

(100 µV to 400 mV) AC volts

(100 µV to 400 mV)

VDC Volts

(1 mV to 1000 V)

VAC volts

(1 mV to 1000 V)

Operation

1-8

Function Keys

Power

Automatic power off/power save after 30 minutes. Alarm sounds 30 seconds before power off.

Power off if input < 80 V or < 400 mA. Power save if input > 80 V or > 400 mA, last measurement

displayed, power consumption is reduced. Press any key or change any function to cancel. Defeat

by holding the key for 2 seconds while applying power.

Relative/Percent

Press Action Main Display Secondary

Display

Makes the last 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 Measured value Range

Perform a zero adjust on the 400 Ω range and displayed value is less than 99 by shorting the test leads and

pressing this key. Cycle power to erase the stored zero adjustment.

Operation

1-9

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