3M
™
Advanced Systems Tester 900AST Series
21
Contact Resistance
This is a precision resistance measurement for
applications requiring limited range and high
accuracy. The Contact Resistance function measures
the resistance between the Red/Blue and Green/
Yellow leads.
Connect the Red and Blue test leads to one side of
the circuit and the Green and Yellow test leads to the
other side. Press the
key when you are ready to
measure. The Contact Resistance measurement may
take a few seconds to settle and display a result.
This measurement is not continuous. To retest,
press the
key again.
If the Contact Resistance is greater than 5 ohms,
the test returns immediately with an over-range
indicator.
Check all test leads and repeat the test. To retest,
press the
key again. Use the key to return
to the Resistance measurement.
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