Chapter 3
Calibration, Configuration, and Special Operations
3-43
TDR TEST
TDR (Time Domain Reflectometer)
Time Domain Reflectometer is one of the most powerful diagnostic tools available
for metallic cable troubleshooting. While conventional test methods cannot locate
the fault, TDR is used to reveal conditions about a cable that simple Pass/Fail
reports and raw measurements may not show.
The LANTEK tester uses the TDR test to scan the length of a cable for impedance
problems, or to accurately verify the cable length. TDR is not limited to identifying
just shorts or opens; it also points out any disturbances in the cable.
How TDR Works
The TDR function transmits energy into a cable pair, and the returning reflections
are monitored in a manner similar to radar.
• The shape of the reflection identifies a cable deformity, open, short, or
termination.
• The length of time it takes a transmitted pulse to return is used to calculate
cable length.
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