Agilent 973A Users Guide

HP 972A and 973A Multimeter

User’s Guide

Part Number 00972-90002
March 1995

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

972A

973A

HP 972A and 973A Multimeters

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 HP 972A . . . . . . . . . . . 1-18

AC Voltage HP 973A . . . . . . . . . . . 1-18

AC + DC Voltage HP 973A . . . . . . . 1-19

DC Current . . . . . . . . . . . . . . . . . 1-19

AC Current . . . . . . . . . . . . . . . . . 1-20

Resistance . . . . . . . . . . . . . . . . . 1-20

Continuity . . . . . . . . . . . . . . . . . . 1-20

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

Capacitance . . . . . . . . . . . . . . . . 1-20

Frequency (Volts) . . . . . . . . . . . . . 1-21

Frequency (Amps) . . . . . . . . . . . . . 1-21

Temperature . . . . . . . . . . . . . . . . 1-22

Temperature HP 973A . . . . . . . . . . 1-22

dBm HP 973A . . . . . . . . . . . . . . . 1-22

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

Calibration Table . . . . . . . . . . . . . . . 6-1

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

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

Declaration of Conformity

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 t his prod uct beyo nd its spe cificati ons or f or uses no t intend ed for t his produc t
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 electr ic shock ha zard co ndition when us ing the curren t functi on, do
not leave one probe connected to the circuit under test and the other probe disconnected,
exposed, and readil y accessib le (tou chable) .

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

Safety Summary

WARNING
POSSIBLE ELECTRICAL SHOCK. Calibratio n and pe rforma nce test s are to be perf ormed b y

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 shown in the following table.

Maximum Overvoltage Limitations (AC and DC Voltage Functions)

1000V
MA X indicates th e ma xi mu m vo lt age b et wee n i npu t ter mi nal s an d ea rt h i s ± 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 25 00Vpk bet ween th e COM an d VOLT termi nals. Ex cessive impulse overvol tage
can damage t he multi meter vo ltage f uncti ons. Do n ot meas ure bra nch circui ts (CAT I I) over
600V to earth nor service panel circuits (CAT III) over 300V to earth.

1 - 5

Safety Summary

Function Maximum Operating Input

10 A

mA or µA ± 500 mA (d c or ac r ms) / 25 0 V

Capacitance, Diode Test,
Resistance, Continuity,
Temperature

Frequency

V

± 10 A (dc or ac rms) / 600 V

660 Vrms (sinewave)

660 V rms 2 Hz to 10 kHz
100 V rms 10 kHz t o 200 kHz

± 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 oth er damag e that may res ult in re duced e lectric shock p rotecti on.

2. Keep insulat ion surf ace clea n betwee n the pro be tip c onnecto r 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.

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)
Frequency (Amps) Measurements

RED LEAD

DC & AC Voltage,
Diode, Resistance,
Capacitance, Frequency (Volts),
Temperature, Continuity, and
dBm Measurements

RED LEAD

Current Measurements
(0 to 400 mA)
Frequency (Amps)
Measurements

BLACK LEAD

COMMON
ALL Measurements

1 - 7

Function Switc h

Switch

Positio n

10A

mA

µA

Ω

mV

V
V

1 - 8

HP 972A HP 973A

Display

DC Current

(10 mA to 10 A)

DC Current

(10 µA to 0.4 A)

DC Current

(0.1 µA to 4 mA)

Capacitance

(10 pF to 1000 µF)

Diode Test

(0 to 2 V)

Resistance

( 0.1 Ω to 40 MΩ)

DC volts

(10 µV to 400 mV)

DC Volts

( 1 mV to 1000 V)

AC volts

( to 1000 V)

1 AC input value is shown in secondary display

AC Current

(10 mA to 10 A)

AC Current

(10 µA t o 0. 4 A)

AC Current

(0.1 µA to 4 mA)

Auto Diode Test

(0 to ±2 V)

Continuity

(alarm at < 20 Ω)

AC volts

(10 µV to 400 mV)

DC + AC Volt s

( to 1000 V)

Frequency

(2 Hz to 200 kHz)

1

Frequency

(2 Hz to 10 kHz)

Frequency

(2 Hz to 10 kHz)

Frequency

(2 Hz to 10 kHz)

Temperature in °F
(-112° F to 302° F)

(-59.9 to -5.7 dBm)

(-19.9 to 62.2 dBm)

dBm

dBm

1

1

1

Temperature in °C

(-80° C to 150° C)

Temperature in °F

(-58° F to 1292° F)

Temperature in °C
(-50° C to 700° C)

Operation

Function Key s

Power

Automatic power off 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

Calculates th e perce ntage ch ange

Perform a zero adjust when using the 400 Ω range or 40 mV range and displayed value is less than 99 by
shorting the test leads and pressing this key. Perform a zero adjust on the 10 nF Capacitance range with the
leads open. Cycle power to erase the stored zero adjustment.

from the reference

Cancels the R elative /% func tion Measured Val ue Range

Each measured value relative to

the referenc e value ( differe nce)

Each measured value as a percent

change of the reference value

Reference valu e
Reference valu e

1 - 9

Operation

Minimum/Maximum 1

Press Action Main Display Secondary Display 2

Begin recording of

minimum and maximum values

Each measured value Elapsed time

Display recorded maximum Maximum measurement Time of Maximum

Display recorded minimum Minimum measurement Time of Minimum

Display last recorded measurement Latest measurement Elapsed time

Pause recording of

minimum and maximum values

Resume recording of

minimum and maximum values

3

Holds display Total elapsed time

Each measured value Elapsed time

Press and hold 1 second to canc el ——

1

Automatic power off and auto ranging are disabled when Min/Max is selected. Bargraph will indicate and
hold the maximum values of the bargraph.

2

Time is recorded and displayed in minutes up to the maximum recording time of 1999 minutes.
Recording will stop at the maximum time.

3

H annunciator is displayed when Min/Max recording

Average

Press Action Main Display Secondary Display

Makes the displayed measurement the

average of the last eight measurements

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 me asureme nt valu e in the display

Enters Auto-Hold function

1

Measurement v alue whe n

hold presse d

Measurement v alue whe n

multimeter be eps

Input value

Range

Cancels Hold function Measurement value Range

1

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

Range

Press Action Main Display Secondary Display

Changes from a uto-r anging t o manua l

Change manual range

UP once with each keypress

Returns to auto-ranging when key is held

1

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

ranging

for 1 second

1

Measurement value Range

Measurement value Range
Measurement value Range

Select

Press this key to use the functions indicated in yellow on the multimeter. See table on page 1-8.
To test display, hold this key when turning meter on.

HP 973A: Not all annunciators turned on during the display test.

1 - 11

Operation

Function Keys and Function Switch Matrix

Function Relative

µA, mA

10A

Hz(Amps) 6

7

Ω

°F, °C Therm

dBm 7

°F, °C Tcp

Hz(Volts) 6

dBm7

7

mV
mV

3

7

V

7

V

3

1

Zero adjust when display shows < 99 on lowest range.5 Secondary display shows elapsed time (in minutes).

2

Secondary display shows reference value.

3

Secondary display shows AC input voltage.

4

Changes input attenuator, frequency is always auto range.

2

•

••••

2

•

••••

1

•

2

••

•

1,2

•

•• •

1,2

•

2

•

••••

2

•

•

•• •

2

•

••••

2

•

••••

2

•

•

%

(Percent)

Min/Max 5 Average Data Hold Auto-Hold Range

••

••••6••

••••

1 - 12

6
6
3

•

6
6

•

••

•

4

•

•

•

6
6

6

••

•

•

••

6
3

•

6

Secondary display and bargraph updates with input value.

7

Bargraph not available.

••

4

•

Display

Low Battery indicator

Replace batteries when on.

Main Display

(Annunciators shown inside front cover)
Number of digits is set by range and function
Displays O.L to indicate an overload condition
Entire display flashes if:

Input overvoltage or
During Amps fuse check

Audio

Secondary Display

Shows:

Range (most functions)
AC input value (Frequency)
Reference value (Relative/%)
Elapsed time (Min/Max)

Bargraph

Active for all functions except:

Capacitance, Temperature,
AC +DC, dBm

Power on
First beep at pow er on.
Second beep wh en begin ning to m ake measur ements .

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

Steady repeating beep
Indicates wh en measu remen t is stea dy when us ing Aut o-Hold f unction .

Rapid repeatin g beeps
Indicates wrong input terminals used for function selected.
Indicates an overload condition at the measurement terminals.

Continuous ton e
Indicates a resistance of < 20 Ω when using the Continuity function.

Auto Power Off/Auto Power Save

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

1 - 13

Calibration and Adjustment

Required Test Equipment

The source used for the calibr ation s hould ha ve an ou tput ac curacy as good or better than
that listed in the specifications.

Calibration Procedure

Environmental range for calibration: 23° C ± 5° C, < 80% RH
Calibration interval: 1 Year

1 Disconnect all input s from th e multi meter a nd open the case as desc ribed on page 6- 5.
2 Install new ba tteries (describe d below) and clos e the cov er. Turn t he mult imeter o n and allo w a

30 minute war m-up. Op en the ca se.

3 Set the multimeter function and range and the source output to the values specified at each step

in the table on page 6- 1.

4 When appropriate, make the adjustments indicated in the table to bring the multimeter display

within the limits.

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

performed by qualif ied ser vice tech nician s. Use a n on-con ductive a djustm ent to ol.

1 - 14

Maintenanc e

Operator protection from electic shock hazard is provided by a double insulated enclosure.
Refer to pag es 1-4 and 1-5 fo r maximu m volt age speci ficatio ns. Whe n servici ng, use o nly
specified re placemen t parts .

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 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. See fuse check procedure in the Troubleshooting table below.

CAUTION
For continued protecti on use on ly the spe cified ma nufact urer pa rt number or HP part number

fuse for re placemen t purp oses.

1 - 15

Maintenance

Troubleshooting

Problem Possible Cause Suggested Action

Unit won’t turn on Dead Batteries
Unit won’t tu rn off Input limit exceed ed

Display flashes

and

Rapid beeps

Battery Annunciator on Low battery voltage

Unable to measure

current

10 A or mA - µA

Input limit exceed ed

Test leads i n wron g

terminal for measurement

Open input protection fuse

function

Replace batter ies
Remove test l eads a nd pres s any ke y to re set
Remove test l eads a nd pres s any ke y to re set

Change test leads or function switch position

Replace batter ies
Check fuse. Connect test lead between V input

terminal and 1 0A or mA µA terminal. Unit will
rapidly beep if fuse is OK. Replace fuse if no
beep.

Cleaning

Wipe instrument with a soft rag dampened with soap and water. Do not immerse in water.
Do not use chemical cleanser or solvents.

Replaceable Parts/Accessories

Refer to the d isassem bly di agram on page 6- 5.

1 - 16

Specifications

Calibration period: one year minimum. Specifications apply at 23° C ± 5° C, < 80% RH
Accuracy = ±(% of reading + number of digits)
Temperature Coefficient = Accuracy X 0.1/° C (-10° 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: -10° to 50°C.

Humidity: 0°C to 40°C / 80% RH max, 40°C to 50°C / 70% RH max (no condensation).
Storage Temperature: -25° to 60°C / 70% RH max (no condensation).

Display reading rate:

ACV, DCV, Diode, Continuity: Approximately 2.3/second
Frequency Approximately 1/second
Capacitance Approximately 0.03 to 2/second
AC + DC Approximately 0.5 to 1/second

Bargraph reading rate: Approximately 23/second
Battery life: Approximately 600 hours

DC Voltage

Range Resolution

40 mV

400 mV

4 V 1 mV

40 V 10 mV

400 V 100 mV

1000 V 1 V

Normal Mode Rejection Ratio: > 60 dB @ 50 or 60 Hz
Effective Common Mode Rejection Ratio ( 1 kΩ imbalance): > 120 dB @ 50 or 60 Hz

972A 973A

Accuracy

10 µV ± (0.3% + 5) ± (0.3% + 5)

100 µV

± (0.2% + 1)

± (0.1% + 1)

± (0.2% + 1)

Input Resistance

10 MΩ (nominal)
11 MΩ (nominal)

10 MΩ (nominal)

1 - 17

Specifications

AC Voltage HP 972A (Average responding, calibrated to display rms)

Range Resolution

40 mV

10 µV ± (1% + 1 0)

400 mV 0.1 m V

4 V 1 mV

40 V 10 mV

400 V 100 mV

1000 V 1 V

Common Mode Rejection Ratio (1 kΩ imbalance): > 60 dB @ DC to 60 Hz
Response time: 2 seconds maximum

40 Hz to

50 Hz

± (1% + 3)
± (1% + 3)

± (1% + 2) ± (0.5% + 2)

± (1% + 2) (40 Hz to 50 0 Hz)

50 Hz to

1 kHz

Accuracy

1 kHz to

5 kHz

Not Specified
Not Specified

± (1.5% + 3) ± (3% + 6)

Not Specified

5 kHz to

20 kHZ

AC Voltage HP 973A (True rms, calibrated for sinewave)

Range Resolution

40 mV

10 µV

400 mV 0.1 mV

4 V 1 mV

40 V 10 mV

400 V 100 mV

1000 V 1 V

Measurement range:

40 Hz to 1 kHz 40 m V to 400 V range 5% to 100% of range
1 kHz to 20 kHz 4 V to 400 V range 10% to 100% of range

Response time: <2 seconds on fixed range
Crest factor: <3
Common Mode Rejection Ratio (1 kΩ imbalance): > 60 dB @ DC to 60 Hz

40 Hz to

50 Hz

± (1% + 3)

± (1% + 3)

± (0.7% + 3) ± (1.2% + 4) ± (2% + 15)

± (1% + 4) (40 Hz to 50 0 Hz)

1000 V range 100 V to 1000 V

50 Hz to

1 kHz

Accuracy

1 kHz to

5 kHz

Not Specified

Not Specified

5 kHz to

20 kHZ

Input Impedance

(nominal)

10 MΩ < 70 pF
11 MΩ < 50 pF

10 MΩ < 50 pF

Input Impedance

(nominal)

10 MΩ < 70 pF
11 MΩ < 50 pF

10 MΩ < 50 pF

1 - 18

AC + DC Voltage HP 973A (True rms, computed from acV, dcV)

Range R esolution

4 V 1 mV

40 V 10 mV

400 V 100 mV

1000 V 1 V

Measurement range:

DC, 40 Hz to 1 kHz 4 V to 400 V range 5% to 100% of range
DC, 1 kHz to 20 kHz 4 V to 400 V range 10% to 100% of range

Response time: < 5 seconds on fixed range
Crest factor: <3
Common Mode Rejection Ratio (1 kΩ imbalance): > 60 dB @ DC to 60 Hz

DC, 40 Hz to

1 kHz

± (1% + 4) ± (1.5% + 6) ± (3% + 18)

± (1% + 6)

DC, to 500 Hz

1000 V range 200 V to 1000 V

Accuracy

DC, 1 kHz to

5 kHz

Not Specified

DC, 5 kHz to

20 kHZ

DC Current

Range Resolution Accuracy Input Resistance Maximum Input

400 µA

4000 µA1 µA

40 mA

400 mA

10 A 10 mA

100 nA

10 µA

100 µA

± (0.5% + 2)
± (0.8% + 2)

± (1.0% + 2)

< 550 Ω

< 8 Ω

< 0.05 Ω ± 15 A (fus ed)

Specifications

Input

Impedance

(nominal)

11 MΩ < 50 pF

10 MΩ < 50 pF

± 0.5 A (fused)

1 - 19

Specifications

1 - 20

AC Current

Range Resolution

400 µA

100 nA

Accuracy

(40 Hz to 2 kHz)

4000 µA1 µA

40 mA

400 mA

10 µA

100 µA

± (1.5% + 4)

10 A 10 mA

HP 972A average responding
HP 973A rms responding, crest factor <3, specified for 5% to 100% of range

Input

Resistance

< 550 Ω

< 8 Ω

< 0.05 Ω

Resistance

Range Resolution Accuracy Test Current

1

400 Ω 100 mΩ± (0.2% + 1)

4.0 kΩ 1 Ω
40 kΩ 10 Ω < 10 µA

± (0.2% + 1)

< 0.8 mA < 3.2 V

< 80 µA

400 kΩ 100 Ω < 1.1 µA

4.0 MΩ 1 kΩ ± (0.5% + 1)
40 MΩ 10 kΩ ± (1.2% + 1)

1

After zero adjust of input leads. Zero adjust range up to 9.9 Ω.

110 nA

Continuity

Measurement Current: 0.8 mA maximum Open circuit voltage: < 3.2 Vpeak
Displayed resistance: 0 Ω to 400 Ω Input protection: 660 Vrms (sinewave)
Alarm: Tone when input < 20 Ω Resolution: 100 mΩ

Diode

Measurement current: +0.5 mA nominal @ 0.6 V Open circuit voltage: < 3.2 Vpeak
Displayed Voltage: 0 V to 2.000 V Input protection: 660 Vrms (sinewave)
Accuracy: ± (1% + 2) Resolution: 1 mV

Maximum Input

0.5 Arms (fused )

15 Arms (fused)

Max Open

Circuit Voltage

< 1.1 V

Capacitance

Range Resolution Accuracy

10 nF 10 pF

100 nF 100 pF

1000 nF 1 nF

10 µF

100 µF

1000 µF1 µF

1

After zero adjust of input leads
Method used: Charge/Discharge of capacitor under test
Maximum display 1199

10 nF

100 nF

1

± (2% + 3)

± (1.2% + 2)

± (3% + 2)

Frequency (Volt s)

Frequency Range Res olution Accuracy Input Voltage (rms)

2 Hz to 99.99 Hz 0.01 Hz

900 Hz to 9999 Hz 1 Hz 0.4 V to 400 V

9.00 kHz to 99.99 kHz 10 Hz 0.8 V to 100 V
90 kHz to 200 k Hz 100 Hz 2 V to 100 V

± (0.02% + 1)

0.2 V to 400 V

Frequency (Amps)

Frequency Range Resolution Accuracy Input Current (rms)

2 Hz to 99.99 Hz 0.01 Hz

± (0.02% + 1) 50 µA to 10 A

900 Hz to 9999 Hz 1 Hz

Response time 3 sec max on fixed range

Specifications

Maximum

Input

660 Vrms90 Hz to 999.0 Hz 0.1 Hz

100 Vrms

Maximum

Input

15 A (fused)90 Hz to 999.0 Hz 0.1 Hz

1 - 21

Specifications

Temperature (5 kΩ @ 25° C Thermistor probe)

° C ° F

Measurement R ange

Resolution

1

Accuracy

1

Accuracy does not include 5 kΩ Thermistor error

-80° to 150° -112° to 302°

0.1° 0.2°

± 0.3° C ± 0.5° F

Temperature HP 973A (K type Thermocouple probe)

° C ° F

Measurement R ange

Resolution

1

Accuracy

1

Accuracy does not include K type Thermocouple error

-50° to 700° -58° to 1292°
1° 1°

± (2% + 2°) ± (2% + 4 °)

dBm HP 973A (600 Ω, 1 mW reference)

Function Input dBm Input Voltage

ACmV -51.8 dBm to -5.7 dBm 2.0 mV to 400 mV

-11.8 dBm to -5.7 dBm 0.2 V to 0.4 V

AC V

-5.7 dBm to 53.3 dBm 0.4 V to 360 V

53.3 dBm to 62.2 dBm 360 V to 1000 V

40 Hz to 1 kHz

± 0.3 dBm
± 0.2 dBm

± 0.2 dBm

40 Hz to 500 Hz

Accuracy

1 kHz to

5 kHz

5 kHz to

20 kHz

Not specified

± 0.2 dBm ± 0.7 dBm

Not specified

1 - 22

Adjustme nts

973A

972A

Calibration Ta ble

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

performed by qualif ied ser vice tech nician s. Use a n on-con ductive t ool.

Step Function Range Input Signal

1

2 380.0 mV
3 40 mV 38.00 mV
4
5 4 V 3.800 V
6 40 V 3 8.00 V

mV

400 mV

400 V 380.0 V

V

Short —

Adjustment

(limits)

1 (±1) ±8 ±4
2 (±1) ±18 ±16
3 (±1) ±8 ±4
4 (±1) ±8 ±4
5 (±1) ±8 ±4

Tolerance (counts)

972A 973A

±1 ±1

6 - 1

Calibration Table

Step Function Range Input Signal

7

8

9 380.0 V @ 5 kHz
10 380.0 V @ 20 kHz —
11
12 3.800 V @ 100 Hz —
13 3.800 V @ 20 kHz —
14
15 38.00 V @ 100 Hz —
16 38.00 V @ 20 kHz —
17
18 400 mV 380.00 mV @ 100 Hz —
19
20
21
22
23 400 mA 380.0 mA —
24
25
26
27
28

mV

µA

mA

10 A

µA

1000 V 1000 V —

V

380.0 V @ 100 Hz

400 V

3.800 V @ 5 kHz

V

V

4 V

38.00 V @ 5 kHz

40 V

40 mV 38.00 mV @ 100 Hz

1000 V 1000 V @ 100 Hz —
400 µA380.0 µA

4000 µA 3800 µA

40 mA 38.00 mA —

10 A 10.00 A

400 µA

4000 µA

380.0 µA @ 100 Hz

380.0 µA @ 2 kHz

3800 µA @ 100 Hz

3800 µA @ 2 kHz

Adjustment

(limits)

6A or 6B (±2) ±21 ±29

C1 (±3) ±60 ±49

C2 (±3) ±60 ±49

C3 (±3) ±60 ±49

Tolerance (counts)

972A 973A

±3 ±3

±120 ±91

±21 ±29

±120 ±91

±21 ±29

±120 ±91

7 (±2) ±48 ±41

±41 ±41
±12 ±14

—
—

8 (±2) ±12 ±12

—
—
—
—

±21 ±21
±32 ±32
±32 ±32
±40 ±40

±61 ±61
±61 ±61
±61 ±61
±61 ±61

6 - 2

Calibration Table

Step Function Range Input Signal

29

30 38.00 mA @ 2 kHz —
31

mA

32 380.0 mA @ 2 kHz —
33
34 10.00 A @ 2 kHz —

10 A

35
36
37
38

Ω

39
40
41
42

40 mA

400 mA

10 A

400 Ω

4 kΩ 3.800 kΩ

40 kΩ 38.00 kΩ

400 kΩ 380.0 kΩ

4 MΩ 3. 800 MΩ

40 MΩ 38.00 MΩ

400 Ω 0 Ω to 100 Ω

38.00 mA @ 100 Hz —

380.0 mA @ 100 Hz —

10.00 A @ 100 Hz —

Short zero adjust

380.0 Ω

Adjustment

(limits)

—
—
—
—
—
—

—
43 2 V 1.000 V —
44
45

100 µF90.0 µF9 (±2) ±29 ±29

10 µF9.00 µF10 (±2) ±12 ±12
46 10 nF Open zero adjust
47 100 nF 90.0 nF

11 (±2) ±21 ±21
48 10 nF 9.00 nF —
49 1000 nF 900 nF —
50

1000 µF900 µF

—
51 Hz (V ) 4 V 9000 Hz @ 1 Vrms —
52 Hz (A)

1

Perform zero adjustment using key.

400 µA 9000 H z @ 100 µA

—

Tolerance (counts)

972A 973A

±61 ±61
±61 ±61
±61 ±61
±61 ±61
±19 ±19
±19 ±19

1

±1 ±1
±8 ±8
±8 ±8
±8 ±8

±8 ±8
±20 ±20
±40 ±40

Tone below appr ox 20 Ω

±12 ±12

1

±1 ±1

±21 ±21
±12 ±12
±29 ±29

±2 ±2

±2 ±2

6 - 3

Replaceable Parts/Accessories

Refer to the d isassem bly di agram 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 as sembly 00972-64401
MP2 Dust/moisture seal 00971-64403
MP3 Bottom case assembly (includes stand) 00972-64402

Operator prote ction f rom el ectric sh ock haz ard is pr ovided b y a doubl e insul ated enc losure.
Refer to the Safety Summary for maximum voltage specifications. When servicing, use only
specified re placemen t parts .

Fuse, 15 A, 600 V fast blow Littlefuse KLK15

Temperature probe, K type thermocouple for

DO NOT SUBSTITUTE

DO NOT SUBSTITUTE

Replacement Tes t Leads, 2 pair E23 05A

Temperature pr obe,

5 KΩ Thermistor

Surface tempe rature s ensor,

12" lead, requires dual banana plug

Thermistor ±0. 1°C

973A only

Rubber Boot 00971-86001

(fits meter with ru bber bo ot)

Soft Case

2110-0940

2110-0941

00973-64401

E2308A

40653B

E2307A

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-Packar d Company, Personal Measurements Operation
Manufacture r’s Add ress: 815 14th Street 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 / E N55011 (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 her ewith complies with the requirements 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: You r l ocal Hewle tt-Packa rd S ales and Service Office or H ewlet t-Pack ard Gm bH,
Department ZQ / Standards Europe, Herrenberger Straβe 130, D-71034 Böblingen (FAX: [phone]).

Warranty/Service

Limited 3 Year Warranty

What is Covered

The HP 972A or HP 973A 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. During the warranty period, we will repair, or at our
option, repl ace at no charge , a produc t that pro ves to be defect ive, pr ovide d yo u re turn t he
product, ship ping prep aid, to a H ewlet t-Packar d se rvice cen ter.

What is Not Covered

This warranty does not apply if th e product ha s been dama ged by acc ident of misu se or as the
result of service or modifica tion by other than an aut horized Hewlett-Pa ckard se rvice cente r.

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 exclu sion or lim itati on o r inc ident al or conse quen tial d ama ges, s o the
above limitatio n or exclusi on may not ap ply to you.

The warranty gives you specific legal rights, and you may also have other rights which vary
from state to s tate, provi nce to pro vince , or c ount ry to coun try.

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 un der wa rran ty or not. Th ere i s a ch arge for r epair s afte r the warr anty p eriod . Repa ir
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 shipp ing time.