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3M
™
Advanced Systems Tester 900AST Series
4
Contrast and Backlighting
Note: Use of backlight decreases available battery
capacity.
Press the
key to display the contrast screen.
Use the
and
keys to adjust the contrast. Press
the key again to turn the backlight on or off.
Use the
key to return to previous screen.
Function Keys
Use the blue keys to select the different tests in the
900AST tester. The blue keys become number or
letter keys when editing.
Use the [Voltage] key to measure DC or AC
voltage.
Use the [Load] key to measure the current
through a simulated load lamp.
Use the [Resistance] key to measure
resistance and access the ‘Soak Test’ and
‘Contact Resistance’ functions.
Use the [Toolbox] key to access: Self
Calibration, Stored Results, Special
Resistance, and the Ohms to Distance
Calculator
Use the [Capacitance] key to measure the
capacitance of a component or circuit.
Use the [Tone] key to send interrupted tone
for circuit identification.