Chapter 8
Copper Testing
Locating faults using the TDR
OneExpert DSL User’s Guide
April 2014
22052280, Revision 001
65
4
To specify the connection, touch the connection:
– Tip to Ring (A to B)
– Tip to Gnd (A to E)
– Ring to Gnd (Ground) (B to E)
5
To specify the termination, select
Options
, and then select the one of the following:
– 1MEG-ohm Term
– 100K-ohm Term
6
To measure DC, select
DC Volts
in the lower right.
The DC Voltage menu appears.
7
To switch between continuous and snapshot mode, use the left system key
Snapshot
or
Continuous
.
8
To save the results to a report, use the Tray menu (
9
To learn what your results mean, see
Measuring voltage is complete.
Locating faults using the TDR
The Time Domain Reflectometer (TDR) feature helps locate cable faults. The TDR identifies
bridged taps, wet sections, load coils, shorts, opens, and splices on the span.
The following procedure describes how to locate cable faults using the TDR.
To locate cable faults using the TDR
1
Connect the Tip (A), Ring (B), and Ground (Earth) leads to the line under test.
2
From the Copper menu, touch the
TDR
button.
3
Press the
Start TDR
system key.
The TDR graph appears.
4
To change the TDR mode, select the
Mode
system key, and then select
SmartGainTDR
(applies 0 gain to 24 AWG cable),
In Home TDR
(does not include Pulse Width), or
Standard
TDR
.
5
To change the cable type, select the
Options
system key, and then select
Cable Type
.
6
To add a DC pulse in order to see changes in the graph, select the
Options
system key, and
then select
Stress
. The spike or dip will shift when the pulse is applied.
NOTE:
You can also press the up or down arrow key to move among the connections.
NOTE:
The TDR must be running for Stress Mode to be available. It is greyed out when the TDR is
stopped.
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