MULTIMETER USAGE

TM 5-2410-233-23

ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED

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MULTIMETER USAGE - CONTINUED

NOTE

If readout will not zero properly, replace batteries and repeat zeroing procedure. If readout will not zero

after batteries have been replaced, notify your supervisor.

Zero Multimeter.

(1)

Set multimeter to ON.

(2)

Select OHMS.

(3)

Select LOWEST VOLTAGE/OHMS scale.

(4)

Touch black and red probes together and check for a zero indication on digital readout.

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.

Testing for Continuity.

(1)

Zero multimeter.

(2)

Connect black and red probes to both terminals of circuit being tested.

(3)

Observe readout and interpret results as follows:

(a) If readout indicates any numeric value, circuit has continuity.

(b) If readout does not indicate any numeric value, or value is over the limits of the meter, circuit is open.

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.

Testing for Shorts. A short (or short circuit) occurs when two circuits that should not be connected have continu-

ity with each other. A short also occurs when a circuit that should not touch ground has continuity 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 any numeric value above 0 (zero) but less than the meter's limits, circuits are

shorted or circuit is grounded, if testing to ground.

(b) If readout does not indicate a numeric value or value does not change when connected to circuit(s) in

question, circuits are not shorted.

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.

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.

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