Tdr - Intec ARGUS 300 Manual

3.3 TDR

The TDR function enables you to determine line lengths in realtime or localise interference
sources. Correct interpretation of the pulses displayed by the ARGUS permits e.g. detec-
tion of stub lines, poor contacts or short-circuits. For this purpose, the ARGUS transmits a
pulse on the connected line and displays its reflection response.
The line may not carry a DC voltage greater than 200 V DC and must be free
of AC voltage components.
The result of a TDR measurement in the ARGUS display may give the
impression of multiple interference sources on the line. It is recommended that
you eliminate the first interference source on the line and then repeat your
measurement. It is possible that the first interference source caused one or more
reflections, which can greatly falsify the reflection at the second interference
source. Often, there is no second interference source on the line.
The ARGUS generates a reflection at approx. 3 m. To precisely measure short
lines and avoid this reflection, using e.g. a 5 m long connection lead is
recommended. The pulse continues to be displayed in the graph but using the
cable ensures that this is not on the line.
This operating mode is a test that may only be performed on lines that are not
connected. Before carrying out the tests, the user must ensure by means of
suitable pre-tests that the line is open or not connected.
After selecting TDR, the wire type can be selected. 20 wire types are already preconfigured
by default.
ARGUS Copper Test Manual
3 Copper tests
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