3M
™
Advanced Systems Tester 900AST Series
8
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.
Use the [RFL] key to find the distance to
a resistance fault between two conductors
or a conductor and ground.
This key is used for editing only.
Use the [TDR] key to activate the Time
Domain Reflectometer.
Use the [Auto] key to activate automatic TDR
trace analysis.
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