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 TM 5-1940-277-20
TM 1940-20/2
TOOLS: Small Flat Tip Screwdriver
PART/MATERIALS: Multimeter with probe wires
REFERENCE: TM 11-6625-203-12 (Army only), Operation and Maintenance of Multimeter AN/URM-105
NOTE
Each time a multimeter is used it must be checked for operation. All multimeters are
tested and "zeroed" the same way.
In unit maintenance the prime use of multimeter is to test continuity or voltage.
TO `ZERO" MULTIMETER:
1.
Selector switch off.
2.
Check that needle is directly over zero on left side of scale.
3.
Use mechanical adjusting screw to position needle over zero.
NOTE
One half of the multimeter has now been "zeroed" for correct scale readings.
Set selector switch on X1 OHMS.
4.
Cross ends of probes.
5.
6.
Turn ohm adjustment knob until needle is over zero on right side of scale.
NOTE
q If any OHMS times (X) other than one is to be used, that section should be "zeroed"
before using.
NOTE
The multimeter scale is now adjusted for correct voltage and continuity reading.
q
USING MULTIMETER TO TEST ELECTRICAL SYSTEM:
Multimeter can be damaged if the voltage scale is set too low for voltage being
q
tested. Needle will indicate off scale to the left if black probe is connected to
the positive (+) terminal.
To test for continuity, battery must be disconnected.
q
If you are not sure that no voltage is in a circuit, test for voltage first.
q
7.
To test for continuity, sat selector switch to OHMS.
3-338
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