HP 972a, 973a User Manual
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
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