Exfo FTB-635 Wideband Copper and DSL Test Module Manual de usuario Pagina 280

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Impulse Tests
272 FTB-635
WB Impulse Noise Test
Impulse Separation Time defines the shortest time between
consecutive discrete impulses, and is used for centering the impulse
on the graph. This separation time also defines the largest allowable
gap between threshold events within a single impulse.
Import from Impulse Scope button allows you to import the Impulse
Separation Time value from Impulse Scope.
Plot Interval allows you to define the time period to display the
impulse noise spikes on the graph.
Setting Threshold Values
The Test Thresholds page allows you to set the WB Impulse Noise
Threshold values for the test.
To set the threshold values:
1. From either the WB Count or WB Histogram tab, tap the Edit
Thresholds button to open the Test Thresholds page.
2. Set the threshold values as required.
3. Tap Close to confirm and close the page.
The page allows you to set the following parameters:
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