TM 10-3930-641-20
(Sheet 2 of 8)
ELECTRICAL TEST EQUIPMENT (CONT)
OHMS SCALE
USING THE OHMS SCALE
The ohms (Ω) scale is used to make tests for continuity, shorts,
and resistance.
NOTE
Proper operation of electrical components depends upon
proper grounding. In all troubleshooting procedures of
devices which depend on screws or physical contact for
their electrical ground (lamp sockets, sending units,
batteries, etc), use a jumper wire from the device to the
truck frame to check grounding.
The multimeter must be set up and zeroed before making these
tests. Perform the following steps for the multimeter you are using.
AN/URM-105
A Set selector switch (1) to X1 ohms position.
B Now zero the meter. Touch the two probes (2) together while
turning ohms adj knob (3) until needle (4) is over 0 on the top
scale.
C If needle will not zero, replace the batteries. If needle still will not
zero after replacing the batteries, turn in the multimeter for repair.
TA 098580
Go on to Sheet 3
2-51
