user manual

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CHAPTER 5: Measurements
Press ESC to exit the ATTENUATION screen.
NOTE
Attenuation always reports the worst dB value regardless of the Report:
setting in the RUN OPTIONS screen.
5.3.5 R
ETURN L OSS
The Return Loss function measures the uniformity of a cable’s impedance.
OMNIScanner injects a signal into the cable and measures the reflected signal
strength. Return Loss measures the difference between the transmitted signal
delivered to the cable and the reflected signal at the input port of the cable. The
reflected signal is the result of impedance mismatches in the link under test.
In the RETURN LOSS screen, the worst case margin for all near end and far
pairs is shown at the top of the screen.
The pairs are displayed in the column on the left side, followed by the Return
Loss in decibels (dB), the Return Loss margin/limit, and the frequency. The result
for each pair is tagged with a PASS or FAIL indicator.