EXFO Optical Power Expert User Manual page 38

Setting up and Using Your PX1
Working With Pass/Fail Thresholds
5. You can enable or disable the thresholds using the corresponding
sliders. If you want to change the value, tap on the threshold you want
to modify.
6. Enter a new value using the arrow buttons.
7. Tap OK to return to the page you were beforehand. The new
thresholds are taken into account for the next measurement.
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PX1