EXFO VDSL2 - Manual (Page 149)

Wideband Tests
Copper, VDSL2, ADSL2+ and IP Triple-Play Test Set 141
Data Rate Prediction
PSD Noise
The PSD Noise tab identifies the
presence of disturber signals when no
filter is selected as Dominant
Disturber and the RMS Noise value
from the power spectral density (PSD)
noise tests in text and graphical form.
RMS noise voltage measures the
signal-to-noise ratio of the circuit.
The list and buttons on the tab are
described below:
³
(Zoom function List) allows you to select the desired zoom function:
Horizontal Zoom or Vertical Zoom. The selected function is displayed
in the box.
³
Zoom In allows you to increase the level of zoom for the selected
zoom function.
³
Zoom Out allows you to reduce the level of zoom for the selected
zoom function.
To zoom in or out:
1. Press
to display a list of zoom functions.
2. Press the up/down arrow keys to highlight the desired zoom function.
3. Press to select the zoom function.
4. Use the left/right arrow keys to highlight the Zoom In or Zoom Out
button as required, then press .
The graphical display zooms in or out accordingly.
5. Press repeatedly to continue zooming.
To move the screen pointer:
Press the left/right arrow keys to move the screen pointer. The pointer
value updates dynamically.