3M
™
Advanced Systems Tester 900AST Series
48
Target Contact
The first peak or dip on the screen is usually the
“target contact” which occurs at the point where
the 900AST tester connects to the circuit under
test. Since impedances of the different types of
conductors vary significantly, the initial event
caused by the 100-ohm TDR launch circuit
contacting the target can usually be ignored.
Remember that distance zero (0”) begins at the end
of the test leads for the TDR function.
Open Circuit
Any open circuit will show up as a peak on the
screen. A complete open will be the tallest peak
you will see. You cannot see events past a complete
open. A partial open circuit (caused by situations
such as corroded or poorly crimped splices) will
appear as a lower amplitude peak on the screen.
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