EXFO FTB-635 Wideband Copper and DSL Test Module - Manual (Page 200)

TDR Test
192 FTB-635
Manual TDR

Save Test button opens a new page that allows you to save a snapshot
of test results into a result file. Refer Save Test on page 74 for more
information.

Trace allows you to select corresponding configurations showing the
following Trace control values:

Trace 1 (Live)

Trace 2

Trace 3

Drop-down lists of the following TDR values allow you to change their
respective parameters for live Trace 1. Modification of the on-screen
parameters will be applied to the live trace for the next cycle of
measurement. When Trace 2/3 is selected, these parameters are
disabled and the list-values are shown as read only.

Range

Gain

Pulse Width

VoP allows you to change the velocity of propagation value for the
cable using the virtual keyboard. Or to change the value by 0.01,
use the on-screen up/down arrows or up/down arrow keys of the
keypad.
Note: Changes to the VoP only apply during the test, for both factory and user
cables. Upon exiting the test, the original cable VoP value set in the Cable
Book remains unchanged.

Hold trace graph control icon holds the current TDR on screen for
comparison to a new live trace. The held trace is not saved. Select
Save Trace to store a trace in memory for later recall. The icon is only
enabled when at least one trace is configured as Hold in Trace Setup
on page 194.