EXFO MaxTester 635 - Manual (Page 166)

Noise Tests
158 MAX-635
WB Impulse Noise

Result displays the Count, Detection Level, Elapsed Time, and
pass/fail status which is periodically refreshed, until you stop the test.

Test Status displays the current state of measurement or an error
message.
To select the parameter values:
1. Press the up/down arrow keys to highlight the desired parameter.
2. Press the left/right arrow keys to view and select the options.
OR
3. Press on a value to open a list box of options and use the navigation
keys to scroll through.
4. Press to confirm the value.