3M
™
Advanced Systems Tester 900AST Series
39
Single Trace
Insert the supplied coaxial TDR test lead into the
Red and Black test jacks on the 900AST tester.
Connect one TDR test lead to a single conductor
or one side of a pair under test. Test lead polarity
is not important for TDR measurements. If a single
conductor circuit is being tested, connect the other
TDR test lead to another de-energized conductor
near the conductor under test. TDR pulses occur at
such a high frequency that an adjacent conductor
can serve effectively as a ‘return’ for the pulse.
Ground or cable shield can also be used for the
return if desired, but this often results in a very
“noisy” trace and is not recommended. If a pair of
conductors is being tested, place the other test lead
on the second conductor of the pair. Single Trace is
used to view events on a single circuit at a time.
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