3M
™
Advanced Systems Tester 900AST Series
20
Soak Test
Use the Soak Test function to continuously measure
the non-compensated insulation resistance of a
conductor to another conductor, shield, or ground.
This is useful in detecting time varying faults such
as corrosive bridges.
Press the key to access the Soak test from the
Resistance screen. Connect the Red lead to the
conductor under test and the Black lead to the fault
reference (usually ground). Use the
key to save
the active resistance to the “Snap Shot” area. This
measurement will not be accurate if there is foreign
voltage on the conductor.
Use the
key to return to the Resistance
measurement.
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