3M
™
Advanced Systems Tester 900AST Series
19
Resistance
This function measures the resistance between the
Red and Black test leads. It is also the entry point
for accessing the Soak Test and Contact Resistance
measurements.
The “V” in the upper right corner of the screen
indicates that the resistance measurement is
compensating for any foreign voltage on the line.
Press the
key to remove the voltage
compensation. Use this mode only if you have
first determined there is no DC voltage on the
conductor (by using the Voltage function). The non-
compensated measurement is slightly faster, but it is
not as accurate if there is voltage on the conductor.
The resistance measurement can be affected by
moisture on the test lead contacts or their access
points. For the most accurate measurement make
sure that these areas are dry.
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