Hewlett-Packard 00974-90002 User Manual

HP 974A Multimeter

User’s Guide

Part Number 00974-90002
March 1995

© Copyright Hewlett-Packard Company 1994, 1995
All Rights Reserved

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 -1 2

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

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

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

Required Test Equipment . . . . . . . . 1-14

Calibration Procedure . . . . . . . . . . 1-14

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

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

Battery Replacement . . . . . . . . . . . 1-15

Fuse Replacement . . . . . . . . . . . . 1-15

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

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

Replaceable Parts/Accessories . . . . . 1-16

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

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

Declaration of Conformity

1-3

Safety Summary

The CAUTIONS and WARNINGS w hich ap pear on the fol lowing pag es mu st be follow ed 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 b y the prod uct func tions, rang es, an d haza rds as in dicted below .

2. To minimize poss ible elec tric shock ha zard con dition, co nnect onl y two leads at an y one
time to any of the multimeter terminals.

3. To prevent poss ible elec tric shock ha zard con dition whe n using the current function, do not
leave one probe connected to the circuit under test and the other probe disconnected,
exposed, and rea dily a ccessi ble (touch able ).

Safety Symbols

Indicates the operator must refer to an explanation in this manual.

Indicates termina ls at whic h dangerou s voltage s may exist.

WARNING
TO AVOID ELECTRICAL SHOCK or damage to the m ultimet er, do not a pply mor e than

±1000 Vd c or 1000 Vr ms between an y termin al and eart h ground . Use caution when work ing with
voltages abo ve 6 0 Vdc or 4 2 Vpea k. Ens ure test le ads are in go od c ondit ion.

WARNING
POSSIBLE ELE CTRIC AL SHOC K. Do not m ake m eas ureme nts if the case i s dam age d or t he

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 oper ate the multi meter in the presence of flam mable gas es or fumes.

1-4

Safety Summary

WARNING
POSSIBLE ELE CTRIC AL SHOC K. Ca librat ion a nd p erfo rmanc e test s are to b e pe rform ed by

qualified personnel only. Do not attempt calibration or test procedures unless qualified to do so.

CAUTION

To avoid damage to the multimeter fo r inputs abov e 250 Vdc or Vac, dis connect th e test leads
before changing functions. Do not exceed the maximum input limits.

Maximum Overvoltage Limitations (AC and DC Voltage Functions)

1000V
MA X indicates the ma ximu m voltag e be tw een i npu t ter mina ls an d ea rt h is ± 1000 V (dc or ac rms).

Do not use the multimeter on any ACV circuit where the maximum impulse overvoltage may
be more tha n 4000 Vpk or an y DCV c ircui t whe re th e ma ximu m imp ulse overvo ltage ma y 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 II) over
600V to earth or service pa nel circui ts (CAT III) over 30 0V to earth.

1-5

Safety Summary

Function Maximum Operating Input

10 A

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

Resistance , Di ode Te st,
Temperature, Continuity

Frequency
(10 Hz to 9.999 kHz)
(9 kHz to 200 k Hz)

V

± 10 A (dc or ac rms ) / 600 V

500 V (dc or ac rms)

500 Vrms
100 Vrms

± 1000 Vdc or 750 Vrms

Probes and Test Leads

1. Always inspect probes before use. Do not use test leads whose insulation has cuts,

cracks, or oth er d amage tha t may r esul t in r educ ed e lectr ic sh ock pr otectio n.

2. Keep insulation surface clean between the probe tip connector and the finger guards.

3. If probes other than the on es specified are to be used wi th the multi meter, be sure th e

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.

1-6

Operation

Terminals, Shutter, & Test Leads

SAFETY SHUTTE R

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.

RED LEAD

Current Measurements
(0 A to 10 A)

RED LEAD

DC & AC Voltage,
Diode, Resistance,
Frequency, Temperature, dBm
and Continuity Measurements

RED LEAD

Current Measurements
(0 to 400 mA)

BLACK LEAD

COMMON
ALL Measurements

1-7

Operation

Function Switc h

Switch

Position

10A

500 mA

50 mA

500 µA

Ω

mV

1-8

Display

DC Current

(1 mA to 10 A)

DC Current

(10 µA to 0.5 A)

DC Current

(1 µA to 0.05 A)

DC Current

(0.01 µA to 0.5 mA)

Diode Test Auto Diode Test
Resistance

( 0.01 Ω to 50 MΩ)

DC Millivolts

(10 µV to 500 mV)

V
V

DC Volts

(100 µV to 1000 V)

AC Volts

(1 mV to 750 V)

1

Voltage and frequency readings alternate on display

AC Curre nt

(1 mA to 10 A)

AC Curre nt

(10 µA to 0.5 A)

AC Curre nt

(1 µA to 0.05 A)

AC Curre nt

(0.01 µA to 0.5 mA)

Continuity

(alarm at < 100 Ω)

AC + DC Volts

(1 mV to 750 V)

Frequency

(10 Hz to 200 kHz)

Temperature in °F
(-112° F to 302° F)

Frequency and Volts

(10 Hz to 200 kHz)

Temperature in °C

(-80° C to 150° C)

1

(-59.94 dBm to 62.22 dBm)

dBm

Operation

Function Key s

Power

Automatic power of f after 30 min utes. Alarm so unds 30 se conds be fore autom atic pow er off.
Press any key or change any function to cancel automatic power off. Defeat automatic power
off by holding key for 2 seconds whil e applyi ng power .

Relative/Percent

Press Action Main Display Secondary Display

Makes the displ ayed mea surem ent

Calculates the percentage change

Cancels the Relative/% function Measurement value Range

Perform a zero adjust when using the 500 Ω range and displayed val ue is less than 99 by shorting the test
leads and pressing this key. Cycle power to erase the stored zero adjustment.

the reference

from the reference

Each measured value relative to

the reference value (difference)

Each measured valu e as a

percent chan ge o f the refere nce

value

Range

Range

1-9

Operation

Minimum/Maximum 1

Press Action Main Display Secondary Display 2

Begin recording of min, max, and avg

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 reco rded m eas ureme nt Latest measu remen t Elapsed time

Pause recording of minimu m and

Resume recording of minimum and

maximum values
maximum values

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" tim e 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 from all readings during elapsed time.

3

Each measured valu e Elapsed time

Last measured valu e Total elapsed t ime

Each measured valu e Elapsed time

Average

Press Action Main Display Secondary Display

Makes the displ ayed mea surem ent the

average of the last eigh t measu remen ts

Disables the averaging of measurements Each measurement Range

Average value of last eight

measurements

Range

1-10

Operation

Hold/Auto-Hold

Press Action Main Display Secondary Display

Holds the measureme nt value in th e

Enters Aut o-Ho ld fun ctio n

display

1

Input value Range

Measurement valu e when

hold pressed

Range

Cancels Hold f unction Measurement v alue Range

1

Auto-Hold Operation. When measurement becomes stable, multimeter will beep and save the
stable reading. Removing probe from measurement circuit will display and hold the last stable reading.

Range

Press Action M ain Display Secondary Display

Changes from auto -ran ging to ma nual

Change manual ra nge UP onc e with

Returns to auto-ranging when key is held

1

When upper range is reached, the sequence begins again at the lowest range.

ranging

each keypress

for 1 second

1

Measurement value Range

Measurement v alue Range
Measurement v alue Range

Select

Press this key to u se the fun ction s ind icate d in ye llow on the mu ltim eter. Se e table on pa ge 1- 8.
Hold this key to test display when turning meter on.

1-11

Operation

Function Keys and Function Switch Matrix

Function Relative

µA, mA, 10A
µA, mA, 10A

••••••

••••••

%

(Percent)

Min/Max 3 Average Data Hold Auto-Hold Range

•• • • •

Ω

°F, °C

mV

V

V

Hz Hz+V

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).

1

•

••••••

•• •

•• • • •

•••••••

•••••••

••

•

•

••

••

2

1-12

Display

Low Battery indicator

Replace batteries when on.

Main Display

(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

Operation

Secondary Display

Shows:

Range (most functions)
except for
Elapsed time (Min/Max)

Power on
First beep at po wer on.
Second beep when beginning to make measurements.

Single beep
Indicates any valid function key press.
Indicates a new High or Low value recorded when in Min/Max function.

Steady repeatin g beep
Indicates when measurement is steady when using Auto-Hold function.

Rapid repeatin g be eps
Indicates wro ng in put term in als u se d fo r fu ncti on sel ecte d.
Indicates an over load cond ition at the measureme nt termi nals.

Continuous tone
Indicates a resistance of < 100 Ω when using the Continuity fun ction.

Auto Power Off

Pairs of beeps for 30 seconds.
Long beep just before power off.
Cancel by changing function switch position or pressing any key.

1-13

Calibration and Adjus tment

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 in terval : 6 Mo nths

1 Disconnect all inputs from the multimeter and open the case as described on page 6-5.
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 calibrati on table on page 6-2.

4 When appropri ate, make th e adjustme nts indi cated in th e calibrat ion table to bring the m ultimeter

display within the limits.

CAUTION
Dangerous voltages are present during the calibration procedure. Calibration should only be

performed by qualified service technicians Use a non-conductive adjustment tool.

1-14

Maintenance

Operator protection from electric shock hazard is provided by a double insulated enclosure.
Refer to pages 1-4 and 1-5 for maximum voltage specifications. When servicing, use only
specified repla cement pa rts.

Battery Replacement

Replace the battery when the symbol appears in the display or 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 drawi ng on pag e 6- 5.

Fuse Replacement

Fuse locations are sh own in the dia gram on pag e 6-5. Fuses ar e listed in the replaceabl e part
list on page 6-4.

CAUTION
For continued protection use only the specified manufacturers part number or HP part number

fuse for replacem ent purpos es.

1-15

Maintenance

Troubleshoo ting

Problem Possible Cause Suggested Act ion

Unit won’t turn on Dead Batteries
Unit won’t turn off Input limit exceeded

Display flashes and Rapid

beeps

Input limit exceed ed

Replace batteries
Remove test lead s and pres s any key to reset.

Remove test lead s and pres s any key to reset.

Battery Annun ciator on Low battery vo ltage

Unable to measure current

10 A or mA - µA

Blown input pr otec tion fu se

Cleaning

Wipe instrumen t wit h a soft r ag d ampen ed w ith soa p an d wa ter. D o no t imm erse i n wat er.
Do not use chemical cleansers or solvents.

Replaceable Parts/Accessories

Refer to the disassembly diagram on page 6-5.

1-16

Replace batteries
Replace fuse(s)

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. Do not use product in flammable atmosphere.
Operating Temperature: 0° to 40°C / 80% RH max (no condensation).

Storage Temperature: -25°C to 60°C / 20% to 70°C RH (no condensation).

Display reading rate: Approximately 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

5 V

50 V 1 mV

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 k Ω imbalance: > 120 dB @ 50 or 60 Hz

AC Voltage (RMS responding, calibrated to display rms)

Range Resolution

500 mV

5 V

500 V 10 mV
750 V 100 V

10 µV

100 µV

20 Hz to

50 Hz

± (1% + 30)

± (1% + 30) 20 Hz to 1 kHz

10 µV

100 µV

± (0.0 5% + 2)

Accuracy

50 Hz to

10 kHz

± (0.7% +30) ± (2% + 50)

± (0.5% + 30) ± (1% + 40) ± (2% + 70) ± (3% + 300)50 V 1 mV

10 kHz to

30 kHz

> 1000 MΩ
11 MΩ (nominal)

10 MΩ (nominal)

30 kHz to

50 kHZ

Not Specified

Not Specified

50 kHz to

100 kHz

Input

Impedance

(nominal)

11 M Ω

< 50 pF

10 M Ω

< 50 pF

1-17

Specifications

AC + DC Voltage (rms responding, computed from acV, dcV)

Range Resolution

5 V 1 mV

50 V 10 mV

500 V 100 mV
750 V 1 V

Measurement range:

500 mV to 500 V ranges 20 Hz to 30 kHz 5% 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, 20 Hz to

10 kHz

± (1% + 30) ± (1.2% + 40) ± (2.5% + 70) ± (3.5% + 300)

± (1% + 30)

DC, 20 H z to 1 k Hz

30 kHz to 100 kHz 10% to 100% of range

DC, 10 kHz to

30 kHz

Accuracy

DC, 30 kHz to

50 kHZ

Not Specified

DC Current, AC Current (40 Hz to 1 kHz), 5% to 100% of range

Range Resolution

500 µA

500 mA

10 A 1 mA

10 nA

1 µA< 12 Ω

10 µA < 2.5 Ω

DC Current

Accuracy

± (0.3% + 2)

± (0.7% + 2) < 0.05 Ω

AC Current

Accuracy

± (1% + 20)

Input

Resistance

< 1050 Ω

DC, 50 kHz to

100 kHz

Maximum

Input

0.5 A (fused)50 mA

15 A (fused)

1-18

Resistance

Range Resolution Accuracy Test Curr ent

500 Ω 10 mΩ± (0.06% + 2)

5.0 kΩ 100 mΩ

1

< 800 µA

± (0.06% + 2) 50 kΩ 1Ω < 80 µA

500 kΩ 10 Ω < 15 µA

5.0 MΩ 100 Ω ± (0.5% + 1) < 1.5 µA
50 MΩ 1 kΩ ± (1.0% + 2)

1

After zero adjust of input leads. Zero adjust range up to 0.99 Ω.

Response time: 500 Ω to 500 kΩ — < 2 seconds, 5 MΩ to 50 MΩ — < 10 seconds.

< 150 nA

Max

Open Circuit

Voltage

< 5.5 V

< 2.2 V

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 m Sec 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) Resolution: 100 µV

Frequency (AC Coupled)

Frequency Range Resolution Accur acy Input Voltage (rms)

10 Hz to 99.99 Hz 0.01 Hz

0.45 mV to 500 V90 Hz to 999.0 Hz 0.1 Hz

900 Hz to 9.999 Hz 1 Hz

9.00 kHz to 99.99 kHz 10 Hz .7 V to 100 V
90 kHz to 200 kHz 100 Hz 1.5 V to 100 V

± (0.05% + 1)

Specificatio ns

1-19

Specifications

Temperature (5 kΩ @ 25°C Thermis tor pr obe)

°C °F

Measurement Range

Resolution

1

1

Accuracy

Accuracy does not include 5 k Ω Thermistor error

-80° to 150° -112° to 302°

0.1° 0.1°

± 0.2°± 0.4°

dBm 600 Ω 1 mW reference (rms responding, computed from AC Voltage)

Input dBm I nput Voltage

-29.82 dBm to

-23.80 dBm

-23.80 dBm to

-3.80 dBm

-3.80 dBm to

55.28 dBm

55.28 dBm to

59.72 dBm

Dynamic range: -59.94 dBm to 59.72 dBm (0.8 mV to 750 V),
Accuracy not specified below -29.82 dBm (25 mV)
Display reads OL (overload) outside dynamic range

25 mV to 50 mV

50 mV to 499.99 mV

0.5 V to 450.00 V
450 V to 750 V

20 Hz to

10 kHz

± 0.2 dBm ± 0.50 dBm
± 0.15 dBm ± 0.30 dBm
± 0.10 dBm ± 0.20 dBm

± 0.15 dBm

to 1kHz

Accuracy

10 kHz to

30 kHz

30 kHz to

50 kHz

50 kHz to

100 kHz

Not specified

± 0.5 dBm ± 1.00 dBm

Not specified

1-20

Adjustments

6-1

Calibration Table

CAUTION
Dangerous voltages are present during the calibration procedure. Calibration should only be

performed by qua lifie d se rvice t echn ician s usin g a non- cond uctive tool.

Step Function Range Input Signal

1

2 480.0 mV
3 -480.0 mV —
4
5 -48.000 V —
6 5 V 4.800 V
7 500 V 480.00 V
8 1000 V 1000 V

*

9

*

10

11 500 mV 480.0 mV @ 200 Hz
12
13 480.00 V @ 100 kHz —
14 480.00 V @ 200 Hz —
15
16 4 .8000 V @ 100 kHz —

*Repeat steps 9 and 10.

6-2

500 mV

V

V

500 mV

50 V

5 V

500 V

5 V

Short —

48.000 V

4.8000 V @ 200 Hz

0.2500 V @ 200 Hz

480.00 V @ 10 kHz

4 .8000 V @ 10 kHz

Adjustment

(limit)

1 (±2) ±26

2 (±2) ±26

3 (±2) ±26
RV4 (±2) ±26
RV5 (±1) ±7

6 (±10) ±270

7 (±5) ±42

8 (±10) ±366

C1 (±20) ±27 0

C2 (±20) ±27 0

Tolerance

(counts)

±2

±26

±26

±1740

±270

±1740

Calibration Table

Step Function R ange Input Signal

17
18 48.000 V @ 100 kHz —

19 48.000 V @ 200 Hz —

V

50 V

48.000 V @ 10 kHz

Adjustment

C3 (±20) ±27 0

20 500 mV 480.00 mV @ 10 kHz —
21 750 V 750.0 V @ 200 Hz —
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

500 Ω

5 kΩ 4.8000 kΩ

Ω

50 kΩ 48.000 kΩ

500 kΩ 480.00 kΩ

5 MΩ 4.80 00 MΩ

50 MΩ 48 .000 MΩ

500 µA500 µA

50 mA

500 mA

10 A

50 mA 48.000 mA —
40 mA 480.00 mA —

10 A 10.000 A

500 µA500 µA 480.00 µA @ 200 Hz

50 mA

500 mA

10 A

50 mA 48.000 mA @ 200 Hz —

500 mA 48 0.00 mA @ 20 0 Hz —

10 A 10.00 A @ 200 Hz —

500 Ω 0 Ω to 150 Ω

Short zero adjust

480.00 Ω 9 (±5) ±30

Short —

480.00 µA

10 (±10) ±72

39 5 V 1.000 V —
40 Hz 5 V 9.000 kHz @ 1 Vr ms —

1

Perform zero adjustment using key.

(limit)

—
—
—
—
—

—

—

—

Tolerance

(counts)

±1740

1

Tone < 100 Ω

±270
±366
±105

±1

±30
±30

±30
±242
±482

±2
±146
±146
±146

±500
±500
±500
±120

±102

±5

6-3

Replaceable Parts/ Accessorie s

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

F1

F2

MP1 Top case assemb ly 0097 4-6440 1
MP2 Dust/moisture se al 0097 1-6440 3
MP3 Bottom case assem bly ( includ es sta nd) 00974- 6440 2

Operator protection from electric shock hazard is provided by a double insulated enclosure. Refer to the Safety
Summary for maximum voltage specifications. When servicing, use only specified replacement parts.

Fuse, 15 A, 600 V fa st blo w L itt lefu se KLK1 5

DO NOT SUBSTITUTE

DO NOT SUBSTITUTE

Rubber Boot 00971-86001

Replacement Test Leads, 2 pair E2305A

Temperature probe, 5 KΩ Thermistor

Surface temperature sensor,

12" lead, require s dual bana na plug

Thermistor ±0.1°C

(fits meter with ru bber boo t)

Soft Case

2110-0940

2110-0941

E2308A

40653B

E2304A

6-4

Disassembly

WARNING

Always disconnect the test leads before opening the case.

Replaceable Parts/Accessories

6-5

DECLARATION OF CONFORMITY

according to ISO / IEC Guide 22 and EN 45014

Manufacturer ’s Name: Hewlett- Packard Company, Personal Measurements Operation
Manufacture r’s Add ress: 815 14th S treet S.W., Loveland, Colorado 80537 U.S.A.

declares, that the products
Product Name:
Model Number: HP 971A, HP 972A, HP 973A, HP 974A
Product Options: None

conforms to the following Product Specifications:
Safety:

EMC: CISPR 11:1990 / EN55011 (1991): Group 1, Class A

IEC 1010-01 (1990) Incl. Amend 1 (1992) / EN61010 (1993)
CSA C22.2 #1010.1 (1992)
UL 1244

Handheld Multimeter

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 requir ements of the

Low Voltage Directive 73 / 23 / EEC and the EMC Directive 89 / 336 / EEC amended
by 93 / 68 / EEC (inclusive 93 / 68 / EEC) and carries the CE mark accordingly.

Loveland, Colorado April 1, 1994

Jim White, QA Manager

European Con tact: Y our l ocal Hewle tt-Pac kard S ales and Service Offic e or H ewlet t-Pack ard GmbH,
Department ZQ / Standards Europe, Herrenberger Straβe 130, D-71034 Böblingen (FAX: [phone]).

Warranty/Service

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 uni t 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. During the warranty period, we will repair, or at our option, replace at
no charge, a product that proves to be def ective, provided you return the product, shippi ng
prepaid, to a Hewlett-Packard service center.

What is Not Covered

This warranty does not apply if the product has been damaged by accident of misuse or as the
result of service or modification by other than an authori zed Hewlett-Packard service center.

No other express warranty is given. The repair or replacement of a product is your exclusive
remedy. ANY OTHER IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS IS LIMITED
TO THE THREE YEAR DURATION OF THIS WRITTEN WARRANTY. Some states, provinces, or
countries do not allow the exclusion or lim itati on or inci dental or co nsequential 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

Hewlett-Packard maintains service centers in many countries throughout the world. You may
have your unit repaired at a Hewlett-Packard service center any time it needs service, whether
the unit is under warranty or not. There is a charge for repairs after the warranty period. Repair
or replacement during the first 30 days after purchase will be provided by the sales channel.
After 30 days, contact the nearest service office.

Hewlett-Packard products normally are repaired and reshipped within five (5) working days of
receipt at any service center. This is an average time and could possibly vary depending upon
the time of year and work load at the service center. The total time you are without your unit will
depend largely on the shipping ti me.