EXFO IQS-12004B DWDM Passive Component Test System for IQS-500 - Manual (Page 96)

Calibrating the DWDM Passive Component Test System
84 IQS-12004B
Performing Reference Measurements
Return Loss Zero Reference Measurement
The Return Loss Zero measurement provides a zero reflection reference to
the WRM return loss detector. This reference will be used to compensate
for internal WRM parasitic reflections as well as parasitic reflections
originating at the WRM output/launch fiber connector.
Note: A Return Loss Zero reference measurement is required each time the
system is turned on, and is recommended whenever there is a significant
change in environmental conditions.
To perform the Return Loss Zero reference measurement:
1. Clean the connectors and connect the modules as indicated on
the screen. For more information, see Maintenance on page 213 and
Connecting Optical Fibers on page 66.
2. Select Return Loss Zero in the IQS-12004B Reference window and
press OK.