HP Hewlett Packard Video Game Keyboard 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  
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  
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  
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 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  
 
 
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. 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 II) over  
600V to earth or service panel circuits (CAT III) over 300V to earth.  
1-5  
 
   
Safety Summary  
Function  
Maximum Operating Input  
± 10 A (dc or ac rms) / 600 V  
± 500 mA (dc or ac rms) / 250 V  
10 A  
mA or µA  
Resistance, Diode Test,  
Temperature, Continuity  
500 V (dc or ac rms)  
Frequency  
(10 Hz to 9.999 kHz)  
(9 kHz to 200 kHz)  
500 Vrms  
100 Vrms  
± 1000 Vdc or 750 Vrms  
V
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.  
1-6  
 
 
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.  
RED LEAD  
DC & AC Voltage,  
Diode, Resistance,  
Frequency, Temperature, dBm  
and Continuity Measurements  
RED LEAD  
Current Measurements  
(0 A to 10 A)  
RED LEAD  
Current Measurements  
(0 to 400 mA)  
BLACK LEAD  
COMMON  
ALL Measurements  
1-7  
 
 
Operation  
Function Switch  
Switch  
Position  
Display  
DC Current  
(1 mA to 10 A)  
AC Current  
(1 mA to 10 A)  
10A  
DC Current  
AC Current  
500 mA  
50 mA  
(10 µA to 0.5 A)  
(10 µA to 0.5 A)  
DC Current  
(1 µA to 0.05 A)  
AC Current  
(1 µA to 0.05 A)  
DC Current  
AC Current  
500 µA  
(0.01 µA to 0.5 mA) (0.01 µA to 0.5 mA)  
Diode Test  
Auto Diode Test  
Resistance  
( 0.01 to 50 M)  
Continuity  
(alarm at < 100 )  
Temperature in °F  
(-112° F to 302° F)  
Temperature in °C  
(-80° C to 150° C)  
DC Millivolts  
mV  
V
(10 µV to 500 mV)  
DC Volts  
(100 µV to 1000 V)  
AC + DC Volts  
(1 mV to 750 V)  
1
AC Volts  
(1 mV to 750 V)  
Frequency  
(10 Hz to 200 kHz)  
Frequency and Volts  
(10 Hz to 200 kHz)  
dBm  
V
(-59.94 dBm to 62.22 dBm)  
1
Voltage and frequency readings alternate on display  
1-8  
 
 
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  
Main Display  
Secondary Display  
Makes the displayed measurement  
the reference  
Each measured value relative to  
the reference value (difference)  
Range  
Each measured value as a  
percent change of the reference  
value  
Calculates the percentage change  
from the reference  
Range  
Range  
Cancels the Relative/% function  
Measurement value  
Perform a zero adjust when using the 500 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.  
1-9  
 
 
Operation  
Minimum/Maximum  
1
2
Press  
Action  
Main Display  
Secondary Display  
3
Begin recording of min, max, and avg  
values  
Each measured value  
Elapsed time  
Display recorded maximum  
Display recorded minimum  
Maximum measurement  
Minimum measurement  
Calculated average  
Time of Maximum  
Time of Minimum  
Elapsed time  
Display recorded average  
Display last recorded measurement  
Latest measurement  
Elapsed time  
Pause recording of minimum and  
maximum values  
Last measured value  
Total elapsed time  
Resume recording of minimum and  
maximum values  
Each measured value  
-
Elapsed time  
-
Press and hold 1 second to cancel  
1
2
Automatic power off is disabled when Min/Max is selected.  
Time is recorded and displayed in minutes and seconds up to 99’ 59". After 99’ 59" time 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.  
Average  
Press  
Action  
Main Display  
Secondary Display  
Makes the displayed measurement the  
average of the last eight measurements  
Average value of last eight  
measurements  
Range  
Disables the averaging of measurements  
Each measurement  
Range  
1-10  
 
Operation  
Hold/Auto-Hold  
Press  
Action  
Main Display  
Secondary Display  
Holds the measurement value in the  
display  
Measurement value when  
hold pressed  
Range  
1
Enters Auto-Hold function  
Input value  
Range  
Range  
Cancels Hold function  
Measurement value  
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  
Main Display  
Secondary Display  
Changes from auto-ranging to manual  
ranging  
Measurement value  
Range  
Change manual range UP once with  
Measurement value  
Measurement value  
Range  
Range  
1
each keypress  
Returns to auto-ranging when key is held  
for 1 second  
1
When upper range is reached, the sequence begins again at the lowest range.  
Select  
Press this key to use the functions indicated in yellow on the multimeter. See table on page 1- 8.  
Hold this key to test display when turning meter on.  
1-11  
 
Operation  
Function Keys and Function Switch Matrix  
%
3
Function  
Relative  
Min/Max  
Average  
Data Hold Auto-Hold  
Range  
(Percent)  
µA, mA, 10A  
µA, mA, 10A  
1
°F, °C  
mV  
V
V
2
Hz  
Hz+V  
dBm  
1
2
3
Invokes zero adjust when display is less than 99.  
Changes input attenuator, frequency is always auto range.  
Secondary display shows elapsed time (in seconds and minutes).  
1-12  
 
 
Operation  
Display  
Low Battery indicator  
Replace batteries when on.  
Secondary Display  
Shows:  
Range (most functions)  
except for  
Elapsed time (Min/Max)  
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  
Power on  
First beep at power 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 repeating beep  
Indicates when measurement is steady when using Auto-Hold function.  
Rapid repeating beeps  
Indicates wrong input terminals used for function selected.  
Indicates an overload condition at the measurement terminals.  
Continuous tone  
Indicates a resistance of < 100 when using the Continuity function.  
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 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  
1
2
Disconnect all inputs from the multimeter and open the case as described on page 6-5.  
Install new batteries (described below) and close the cover. Turn the multimeter on and allow a  
30 minute warm-up. Open the case.  
3
4
Set the multimeter function and range and the source output to the values specified at each step  
in the calibration table on page 6-2.  
When appropriate, make the adjustments indicated in the calibration table to bring the multimeter  
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 replacement 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.  
CAUTION  
For continued protection use only the specified manufacturers part number or HP part number  
fuse for replacement purposes.  
1-15  
 
 
Maintenance  
Troubleshooting  
Problem  
Possible Cause  
Dead Batteries  
Suggested Action  
Replace batteries  
Unit won’t turn on  
Unit won’t turn off  
Input limit exceeded  
Remove test leads and press any key to reset.  
Remove test leads and press any key to reset.  
Display flashes and Rapid  
beeps  
Input limit exceeded  
Battery Annunciator on  
Low battery voltage  
Replace batteries  
Replace fuse(s)  
Unable to measure current  
Blown input protection fuse  
10 A or mA - µA  
Cleaning  
Wipe instrument with a soft rag dampened with soap and water. Do not immerse in water.  
Do not use chemical cleansers or solvents.  
Replaceable Parts/Accessories  
Refer to the disassembly diagram on page 6-5.  
1-16  
 
 
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  
10 µV  
100 µV  
1 mV  
Accuracy  
Input Resistance  
> 1000 MΩ  
11 M(nominal)  
500 mV  
5 V  
± (0.05% + 2)  
50 V  
500 V  
1000 V  
10 mV  
10 M(nominal)  
100 mV  
Normal Mode Rejection Ratio: (NMR) > 60 dB @ 50 or 60 Hz  
Effective Common Mode Rejection Ratio (CMR) 1 kimbalance: > 120 dB @ 50 or 60 Hz  
AC Voltage (RMS responding, calibrated to display rms)  
Accuracy  
Input  
Impedance  
(nominal)  
Range Resolution  
20 Hz to  
50 Hz  
50 Hz to  
10 kHz  
10 kHz to  
30 kHz  
30 kHz to  
50 kHZ  
50 kHz to  
100 kHz  
500 mV  
5 V  
Not Specified  
10 µV  
100 µV  
1 mV  
± (0.7% +30) ± (2% + 50)  
11 M Ω  
< 50 pF  
± (1% + 30)  
50 V  
± (0.5% + 30) ± (1% + 40) ± (2% + 70) ± (3% + 300)  
10 M Ω  
500 V  
750 V  
10 mV  
100 V  
< 50 pF  
Not Specified  
± (1% + 30) 20 Hz to 1 kHz  
1-17  
 
 
Specifications  
AC + DC Voltage (rms responding, computed from acV, dcV)  
Accuracy  
Range  
Resolution  
DC, 20 Hz to  
10 kHz  
DC, 10 kHz to DC, 30 kHz to  
DC, 50 kHz to  
100 kHz  
30 kHz  
50 kHZ  
5 V  
50 V  
500 V  
1 mV  
10 mV  
100 mV  
± (1% + 30)  
± (1.2% + 40)  
± (2.5% + 70)  
± (3.5% + 300)  
± (1% + 30)  
750 V  
1 V  
Not Specified  
DC, 20 Hz to 1 kHz  
Measurement range:  
500 mV to 500 V ranges 20 Hz to 30 kHz  
5% to 100% of range  
30 kHz to 100 kHz 10% to 100% of range  
75 V to 750 V  
750 V range  
Response time: < 2 seconds for AC, 5 seconds for AC+DC on fixed range  
Crest factor: <3  
Common Mode Rejection Ratio (CMR) 1 k imbalance: > 60 dB @ DC to 60 Hz  
DC Current, AC Current (40 Hz to 1 kHz), 5% to 100% of range  
DC Current  
Accuracy  
AC Current  
Accuracy  
Input  
Resistance  
Maximum  
Input  
Range  
Resolution  
10 nA  
1 µA  
10 µA  
1 mA  
500 µA  
50 mA  
500 mA  
10 A  
< 1050 Ω  
< 12 Ω  
< 2.5 Ω  
< 0.05 Ω  
0.5 A (fused)  
15 A (fused)  
± (0.3% + 2)  
± (0.7% + 2)  
± (1% + 20)  
1-18  
 
 
Specifications  
Resistance  
Max  
Open Circuit  
Voltage  
Range  
Resolution  
Accuracy  
Test Current  
1
500 Ω  
5.0 kΩ  
50 kΩ  
10 mΩ  
100 mΩ  
1Ω  
± (0.06% + 2)  
< 5.5 V  
< 2.2 V  
< 800 µA  
± (0.06% + 2)  
< 80 µA  
< 15 µA  
< 1.5 µA  
< 150 nA  
500 kΩ  
5.0 MΩ  
50 MΩ  
10 Ω  
100 Ω  
1 kΩ  
± (0.5% + 1)  
± (1.0% + 2)  
1
After zero adjust of input leads. Zero adjust range up to 0.99 .  
Response time: 500 to 500 k— < 2 seconds, 5 Mto 50 M— < 10 seconds.  
Continuity  
Measurement Current: 0.8 mA maximum  
Open circuit voltage: < 5.5 Vpeak  
Displayed resistance: 0 to 499.99 Ω  
Input protection: 500 Vrms (sinewave)  
Alarm: Tone when input < 100 Ω ± 50 Ω  
Resolution: 10 m(<100 mSec 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  
Accuracy: ± (1% + 2)  
Input protection: 500 Vrms (sinewave)  
Resolution: 100 µV  
Frequency (AC Coupled)  
Frequency Range  
10 Hz to 99.99 Hz  
90 Hz to 999.0 Hz  
900 Hz to 9.999 Hz  
9.00 kHz to 99.99 kHz  
90 kHz to 200 kHz  
Resolution  
0.01 Hz  
0.1 Hz  
Accuracy  
Input Voltage (rms)  
0.45 mV to 500 V  
1 Hz  
± (0.05% + 1)  
10 Hz  
.7 V to 100 V  
1.5 V to 100 V  
100 Hz  
1-19  
 
 
Specifications  
Temperature (5 k@ 25°C Thermistor probe)  
°C  
°F  
-112° to 302°  
0.1°  
Measurement Range  
Resolution  
-80° to 150°  
0.1°  
1
Accuracy  
± 0.2°  
± 0.4°  
1
Accuracy does not include 5 k Thermistor error  
dBm 600 1 mW reference (rms responding, computed from AC Voltage)  
Accuracy  
Input dBm  
Input Voltage  
20 Hz to  
10 kHz  
10 kHz to  
30 kHz  
30 kHz to  
50 kHz  
50 kHz to  
100 kHz  
-29.82 dBm to  
-23.80 dBm  
25 mV to 50 mV  
50 mV to 499.99 mV  
0.5 V to 450.00 V  
450 V to 750 V  
± 0.2 dBm  
± 0.50 dBm  
Not specified  
-23.80 dBm to  
-3.80 dBm  
± 0.15 dBm ± 0.30 dBm  
± 0.10 dBm ± 0.20 dBm  
-3.80 dBm to  
55.28 dBm  
± 0.5 dBm ± 1.00 dBm  
55.28 dBm to  
59.72 dBm  
± 0.15 dBm  
Not specified  
to 1kHz  
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  
1-20  
 
 
Adjustments  
6-1  
 
 
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  
(counts)  
Step  
Function  
Range  
Input Signal  
(limit)  
1
2
3
4
5
6
7
8
Short  
480.0 mV  
-480.0 mV  
48.000 V  
±2  
±26  
±26  
±26  
±26  
±26  
±26  
±7  
500 mV  
1 (±2)  
500 mV  
2 (±2)  
50 V  
-48.000 V  
4.800 V  
5 V  
3 (±2)  
RV4 (±2)  
RV5 (±1)  
6 (±10)  
V
V
500 V  
1000 V  
480.00 V  
1000 V  
4.8000 V @ 200 Hz  
±270  
9*  
5 V  
0.2500 V @ 200 Hz  
480.0 mV @ 200 Hz  
480.00 V @ 10 kHz  
480.00 V @ 100 kHz  
480.00 V @ 200 Hz  
4 .8000 V @ 10 kHz  
4 .8000 V @ 100 kHz  
7 (±5)  
8 (±10)  
C1 (±20)  
±42  
±366  
±270  
±1740  
±270  
±270  
±1740  
10*  
11  
12  
13  
14  
15  
16  
500 mV  
500 V  
5 V  
C2 (±20)  
*Repeat steps 9 and 10.  
6-2  
 
 
Calibration Table  
Tolerance  
Adjustment  
(limit)  
Step  
Function  
Range  
Input Signal  
(counts)  
±270  
±1740  
±270  
±366  
±105  
±1  
±30  
±30  
±30  
±30  
±242  
±482  
±2  
±146  
±146  
±146  
±72  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
1
48.000 V @ 10 kHz  
48.000 V @ 100 kHz  
48.000 V @ 200 Hz  
480.00 mV @ 10 kHz  
750.0 V @ 200 Hz  
Short  
C3 (±20)  
50 V  
V
500 mV  
750 V  
1
zero adjust  
500 Ω  
480.00 Ω  
4.8000 kΩ  
48.000 kΩ  
480.00 kΩ  
4.8000 MΩ  
48.000 MΩ  
9 (±5)  
5 kΩ  
50 kΩ  
500 kΩ  
5 MΩ  
50 MΩ  
Short  
500 µA  
500 µA  
480.00 µA  
48.000 mA  
50 mA  
40 mA  
10 A  
50 mA  
500 mA  
10 A  
480.00 mA  
10.000 A  
10 (±10)  
500 µA  
50 mA  
500 mA  
10 A  
500 µA  
50 mA  
500 mA  
10 A  
480.00 µA @ 200 Hz  
48.000 mA @ 200 Hz  
480.00 mA @ 200 Hz  
10.00 A @ 200 Hz  
0 to 150 Ω  
±500  
±500  
±500  
±120  
Tone < 100 Ω  
±102  
±5  
500 Ω  
5 V  
1.000 V  
Hz  
5 V  
9.000 kHz @ 1 Vrms  
Perform zero adjustment using  
key.  
6-3  
 
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  
F1  
2110-0940  
DO NOT SUBSTITUTE  
Fuse, 15 A, 600 V fast blow Littlefuse KLK15  
F2  
2110-0941  
DO NOT SUBSTITUTE  
MP1  
MP2  
MP3  
Top case assembly  
Dust/moisture seal  
00974-64401  
00971-64403  
00974-64402  
00971-86001  
E2305A  
Bottom case assembly (includes stand)  
Rubber Boot  
Replacement Test Leads, 2 pair  
Temperature probe, 5 KThermistor  
E2308A  
Surface temperature sensor,  
Thermistor ±0.1°C  
40653B  
E2304A  
12" lead, requires dual banana plug  
Soft Case  
(fits meter with rubber boot)  
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.  
6-4  
 
 
Replaceable Parts/Accessories  
Disassembly  
WARNING  
Always disconnect the test leads before opening the case.  
6-5  
 
 
DECLARATION OF CONFORMITY  
according to ISO / IEC Guide 22 and EN 45014  
Manufacturer’s Name:  
Manufacturer’s Address:  
Hewlett-Packard Company, Personal Measurements Operation  
815 14th Street S.W., Loveland, Colorado 80537 U.S.A.  
declares, that the products  
Product Name:  
Handheld Multimeter  
HP 971A, HP 972A, HP 973A, HP 974A  
None  
Model Number:  
Product Options:  
conforms to the following Product Specifications:  
Safety:  
IEC 1010-01 (1990) Incl. Amend 1 (1992) / EN61010 (1993)  
CSA C22.2 #1010.1 (1992)  
UL 1244  
EMC:  
CISPR 11:1990 / EN55011 (1991): Group 1, Class A  
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 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 Contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH,  
Department ZQ / Standards Europe, Herrenberger Straβe 130, D-71034 Böblingen (FAX: +49-7031-143143).  
 
 
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 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, replace at  
no charge, a product that proves to be defective, provided you return the product, shipping  
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 authorized 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 limitation or incidental or consequential 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 time.  
 

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