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OP940-SW
If the reference is good, the OP940 will
display the reference distance and RL
value, and the progress bar will turn yellow.
Typical RL values are -14dB for an open
UPC connector.
If a large reflection is present at the front
panel, the progress bar will turn blue.
If the RL reference fails or is stopped,
the progress bar will turn red.
After referencing return loss, the unit will
begin to display the return loss readings
for both wavelengths in real time.
To return to the measurement screen,
press the Home Button.
Return Loss
Example 1 (cont.): Referencing and Measuring Return Loss
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