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TM 5-2410-233-23
ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED
0177 00
MULTIMETER USAGE - CONTINUED
(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.
Voltage Tests.
a.  Measuring DC Voltage.
(1)
Set multimeter to ON.
(2)
Select lowest possible DC VOLTAGE range that is still higher than voltage to be measured.
(3)
Connect red probe to positive (+) pin and black probe to negative (-) pin.
(4)
Observe readout and interpret results as DC voltage in circuit being tested.
b.  Measuring DC Voltage Drop.
NOTE
Voltage drop is defined as the amount of voltage loss that occurs through all or part of a circuit due to resis-
tance.
(1)
Set multimeter to ON.
(2)
Select lower possible DC VOLTAGE range that is still higher than voltage to be measured.
(3)
Connect red probe to test location closest to positive (+) side. Connect probe to test location closest to
ground.
(4)
Observe readout and interpret results as DC voltage in circuit being tested.
c.
DC Voltage Drop Examples.
Good Voltage Drop.
(1)
(a) Example A shows how to measure voltage drop across a good splice connection. Voltage reading at
multimeter should be low (about 0.1 volt). This means that resistance across this splice is low, result-
ing in low voltage drop.
EXAMPLE A
24 - VOLT
GOOD SPLICE
BATTERY PACK
CONNECTION
SWITCH
LAMP
(CLOSED)
386-593
(b) Example B shows how to measure voltage drop across a closed switch. Voltage reading at multimeter
also should be low (about 0.1 volt). This means that resistance across this switch is low, resulting in
low voltage drop.
0177 00-6

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