22 Copper tests
312
ARGUS 152
22.5 TDR / Advanced TDR
The TDR function enables you to determine line lengths in realtime or localise interference
sources. Correct interpretation of the pulses displayed by ARGUS permits e.g. detection of
stub lines, poor contacts or short-circuits. For this purpose, ARGUS transmits a pulse on
the connected line and displays its reflection response.
22.5.1 TDR settings
The chapter "Configuring accesses", page 27, explains how to set up the access type
"Copper tests".
22.5.2 Starting TDR
The chapter "Configuring accesses", page 27, explains how to set up the connection type
"Copper tests".
Continued on
next page
TDR
ARGUS status display.
ARGUS indicates any DC voltage on the
line.
<Setting>
<Menu>
<Start>
Select and start TDR.
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.
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.
Switches to the settings for the
wire-type list, see page 291.
Switches to main menu.
Directly accesses "Single
tests" menu.