EXFO MaxTester 635 - Manual (Page 150)

Noise Tests
142 MAX-635
VF Noise
VF Noise
The VF Noise test allows you to measure the amount of unwanted or
disturbing energy introduced into a loop from man-made and natural
sources.
Detection
The Detection function displays and updates results in
real time, until you stop the test. The last valid results
then remain displayed.

Current Group is the current test group name, for
example Noise.

Current Test displays the test being measured.
Here you can switch to another test from the given
list. However, this action will terminate the
ongoing measurement test.

VF Noise Filter allows you to define the voice
frequency noise filter to be used, dependent on
ITU or ANSI Standard mode and Noise Filter set in Setup/Application
Settings.

Termination Resistance is a read-only value of 600 Ω .

Threshold Settings button opens a new page that allows you to set the
VF Noise threshold.

Result displays the pass/fail status and VF Noise value.

Test Status displays the current state of measurement or an error
message.
Note: The selected VF Noise Filter shown in addition to the current Level units
selected in Setup/Application Settings have an influence on the
measurement units displayed on this page.