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OP940-SW
If problems arise during testing of insertion
loss or return loss, it can often be helpful
to diagnose the problem by using Scan
Mode. From the measurement mode
where the problems are arising, navigate
to the Mode Select screen by pressing the
Home button.
From the Mode Select screen, navigate to Scan Mode.
If the problem is suspected to be farther than 5 meters from the front panel of the unit,
adjust the display window until the reflection is on the screen.
Adjust the pulse mode to the proper setting:
Low mode will give a good scan for reflections between 10dB to 35dB.
High mode will give better results for reflections between 30dB to 80dB.
Very small reflections in the range of about 70dB to 80dB will be very difficult to see on
the screen regardless of the settings. It is suggested that High Mode and G3 be used
in these cases.
Scan Mode
Example 5: Performing OTDR-style trace in Scan Mode
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