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3M™ Dynatel™ Advanced Modular System 965AMS Measurement Functions
TDR
Use the Time Domain Reectometer (TDR)
function to
map the high-frequency impedance of the cable along its length.
The display shows opens, load coils, splits, wet sections, splices,
gauge changes, heavy shorts and any other physical deviation
from a perfect cable. Each of these events have their own unique
signature. A user-controlled vertical cursor is used to measure
the distance to an event.
TDR>Event Recognition
“Events” are the “dips” and “peaks” seen on the screen caused
by faults or changes in the pair.
“Peak” Events
1. Launch Pulse: The rst peak on the screen is the “launch
pulse” which occurs where the transition from the tester to
the test leads occurs.
2. Open: A clean or partial open will show up as a peak on
the screen. The “cleaner” the open, the taller the peak. A
complete open will be the tallest peak (other than the launch
pulse).You can not see events past a complete open.
3. Load Coil: A load coil looks very similar to an open. If
you think there is a load coil on the pair, use the Load Coil
function (in the POTS test) to verify its presence. You can
not see events past a traditional load coil.