3M
™
Advanced Systems Tester 900AST Series
49
Short Circuit
A short circuit (or zero-Ohm resistance fault) will
show up as the lowest dip on the screen. You cannot
see events past a short circuit.
Resistance Fault
A resistance fault will show as a dip on screen. The
lower the value of resistance (or the closer to a zero-
ohm short), the lower the dip.
Bridge Tap
A bridge tap is a wire that has one or more wires
branching off of the main wire. The beginning of
the bridge tap will look like a resistance fault and
an open. (A dip followed by a peak.) The distance
between the two events is the length of the bridge
tap. The start of a bridge tap looks like a resistance
fault. Use the 900AST tester Resistance function to
measure the resistance on the conductors. If there is
no resistance, and you see a dip followed by a peak,
you might suspect a bridge tap.
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