8163A/B, 8164A/B, 8166A/B User’s Guide 209
Return Loss Measurement 7
If we divide equation 8 by equation 7, this gives us the following equations:
Thus we can use the equation below to calculate return loss:
The return loss of the reference reflection is given by:
Calculating the Front Panel Delta
The Front Panel Delta is the change in loss variation that is caused by
replacing the reference cable, as used in Reflectance Calibration on
page 192, with the measurement patchcord, as used in How to Measure
Return Loss on page 198. This is caused by differences in reflections from
the front panel connector and also differences in the backscatter level of
the fibers.
To measure the front panel delta you must measure the power transmitted
through the reference cable, Measuring the Power Transmitted Through
the Reflection Reference on page 204, and the power transmitted through
the measurement cable, see Measuring the Power Transmitted Through
the Measurement Patchcord on page 205. The system may be represented
by Figure 131 on page -210:
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