TM 5-3805-248-23-1
ELECTRICAL GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED
0018 00
MULTIMETER USAGE - CONTINUED
d.
Testing for Resistance. Allowable resistance readings depend on circuit being tested. Refer to the particular sec-
tion in this manual dealing with that circuit or component for allowable readings.
WARNING
Before performing a continuity test, always place battery disconnect switch in OFF position and disconnect
circuit to be tested. Failure to follow this warning may result in injury to personnel and damage to multime-
ter.
(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.
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 lowest 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.
0018 00-14
