MULTIMETER USAGE (Cont) - TM-5-2410-237-231290

TM 5-2410-237-23

ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED

0242 00

MULTIMETER USAGE - CONTINUED

(2)

Bad Voltage Drop.

(a) Example D shows how to measure voltage drop across a bad splice connection. The voltage reading at

multimeter is high (for example 7 volts). This means the resistance across this splice is high, resulting

in high voltage drop. This would cause lamp to be dimly lit when switch is closed.

EXAMPLE D

24 - VOLT

BAD SPLICE

BATTERY PACK

CONNECTION

SWITCH

LAMP

(CLOSED)

387-866

(b) Example E shows how to measure voltage drop across an open circuit, in this case an open switch.

This could also be used to demonstrate the reading in a circuit with a broken wire. The voltage reading

at multimeter will be approximately 24 volts. This means that an open circuit or an open switch has

infinite resistance, causing all voltage to be lost.

EXAMPLE E

24 - VOLT

BATTERY PACK

SWITCH

LAMP

(OPEN)

387-867

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