3M
™
Advanced Systems Tester 900AST Series
33
Note: Either the temperature or length (distance
to Strap) must be selected as unknown. Press the
key to clear one of these fields. The cleared
field will be indicated by a ‘#’.
Connect the Red and Blue test leads to the faulted
wire. Connect the Black Lead to the reference. (The
reference is the return path for the fault and can be
the shield or another wire in the cable.) Connect the
Green and Yellow test leads to the separate good pair.
Press the
key after you make the above
connections. If no errors in the hook-up are
detected, the 900AST tester will begin the
measurement and go to the results screen.
During the measurement a bar graph of the
measurement null voltage for Resistance to Strap
(RTS) and then Resistance to Fault (RTF) will be
visible at the bottom of the screen.
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