Current Measurement (Dc); Continuity Measurement Over Long Distances - JLG 1250AJP Troubleshooting Manual

Current Measurement
Figure 6-3. Current Measurement (DC)
• Set up the meter for the expected current range
• Be sure to connect the meter leads to the correct jacks
for the current range you have selected
• If meter is not auto ranging, set it to the correct range
(See multi meter's operation manual)
• Use firm contact with meter leads

6.2 CONTINUITY MEASUREMENT OVER LONG DISTANCES

When trying to determine continuity of a harness or wire, longer than the reach of standard instrument leads, is possible to
perform the check without excessively long leads. Using the other wires in the harness one can determine the condition of a
particular wire in the harness.
Requirements:
• Harness with at least three separate wires including the wire under test.
• These wires must be able to be isolated from other wires, etc.
• Jumper or method to connect contacts on one side of harness.
• Meter that can measure resistance or continuity.
Procedure
Test multimeter leads resistance. Subtract this value from the measured resistance of the wires to get a more accurate mea-
surement. In the example below, the meter tested at 1.4Ω.
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SECTION 6 - MULTIMETER BASICS
Continuity Measurement
Figure 6-4. Continuity Measurement
• Some meters require a separate button press to enable
audible continuity testing
• Circuit power must be turned OFF before testing conti-
nuity
• Disconnect component from circuit before testing
• Use firm contact with meter leads
• First test meter and leads by touching leads together.
Meter should produce an audible alarm, indicating con-
tinuity
1250AJP 6-321