Exfo MaxTester 635 Manuale Utente Scaricare il pdf (Pagina 156)

Noise Tests

148 MAX-635

VF Impulse Noise

The VF Impulse Noise test allows you to measure voice frequency impulse

noise on the circuit under test.

Count

The Count function displays and updates results in real time, for the length

of time set in Test Duration or less if you stop the test. The last valid results

then remain displayed.

 Current Group is the current test group name, for

example Noise Tests.

 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.

 Test Duration allows you to set the length of time to run the test from a

list of values.

 Threshold Settings button opens a new page that allows you to set the

VF impulse noise thresholds.

 Result displays the High, Mid, Low counts, respective detection levels,

and Elapsed Time. The pass/fail status of the Mid level is displayed

after 1 s and then periodically refreshed, until you stop the test.

 Test Status displays the current state of measurement or an error

message.

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Exfo MaxTester 635 Manuale Utente Pagina 156