TM 5-3800-205-23-1
ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED
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MULTIMETER USAGE - CONTINUED
CAUTION
Before performing a continuity test, always place battery disconnect switch in OFF position and disconnect
circuit to be tested. Failure to follow this caution may damage multimeter.
c.
Testing for Shorts. A short (or short circuit) occurs when two circuits that should not be connected have metal-to-
metal contact with each other. A short also occurs when a circuit that should not touch ground has metal-to-metal
contact with ground.
(1)
Zero multimeter.
(2)
Connect black probe to one pin and red probe to either ground or another pin.
(3)
Observe readout and interpret results as follows:
(a) If readout indicates 0 (zero), circuits are shorted or circuit is grounded, if testing to ground.
(b) If readout does not indicate 0 (zero), circuits are not shorted.
(c) If readout jumps or flickers, circuits are shorted or grounded intermittently.
CAUTION
Before performing a continuity test, always place battery disconnect switch in OFF position and disconnect
circuit to be tested. Failure to follow this caution may damage multimeter.
d.
Testing for Resistance. Allowable resistance readings depend on circuit being tested. Refer to the particular sec-
tion dealing with that circuit or component for allowable readings.
(1)
Zero multimeter.
(2)
Select OHMS.
(3)
Select LOWEST VOLTAGE/OHMS range. If test specifies ohms range, select required range.
(4)
Connect black and red probes across circuit to be tested.
(5)
Observe readout and interpret results as circuit resistance.
3.
Measuring DC Voltage.
a.
Set multimeter to ON.
b.
Select VOLTS.
c.
Select volts DC.
d.
Select LOWEST VOLTAGE/OHMS range for voltage range that is higher than volts to be measured.
e.
Connect red probe to positive (+) pin and black probe to negative (-) pin.
f.
Observe readout and interpret results as DC voltage in circuit being tested.
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