Keysight Technologies 8163A User Manual page 198

8163A/B, 8164A/B, 8166A/B User's Guide
2 Terminate the measurement patchcord so that there are no reflections
coming from the end.
Tip: You can do this by wrapping the fiber five times around the shaft of a
screwdriver (or some similar object with a diameter of between 5 mm and
7 mm).
3 Move to [Terminated calibration] and press Enter. The instrument
measures the power reflected by the component, and sets the [Para]
values used by the Return Loss monitor's power sensor and monitor
diode.
Return Loss Measurement 7
197