3M
™
Advanced Systems Tester 900AST Series
17
Functions
Voltage
This function measures and displays the DC or AC
voltage between the Red and Black test leads. The
readings are ‘live’ and will vary with the voltage
being measured.
The 900AST tester initially measures DC voltage.
Press the
key to switch from DC to AC voltage
measurement.
Press the key again to switch back from the AC
to the DC voltage measurement.
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