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990DSL
Users Guide
Table 6-3. TDR Auto-Test Softkeys (continued)
Press this key first
V.Pos'n.
H.Pos'n.
Fltr
The tester is designed to automatically find and classify reflections based
on a complex set of testing algorithms. However, due to the variety of
cable types and faults that may be encountered, a visual waveform
interpretation may be required to resolve the actual problem. For
example, the tester in one case may mark a reflection at its peak rather
than its start due to line noise, and misinterpret the cause. In this case,
manually move the reflection cursor to the start of the reflection to get the
proper distance and re-evaluate the cause based that shape of the
reflection.
6-10
Avg
Scan
Then press
The For H key to respectively
move the entire waveform up or
down in the display window.
The I or G key to respectively
move the entire waveform left or
right in the display window.
The F key to apply the Power
Filter (Fltr). Press F again to
remove the filter.
The H key to apply the
Averaging Filter (Avg). Press H
again to remove the filter.
The I or G key to respectively
move Cursor 2 (C2) left or right
(Scan) to the next detected
reflection on the displayed
waveform. If the next reflection is
outside of the current view, the
waveform automatically shifts
position to bring it into view.
Note
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