Return Loss Measurement
132 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement 
System, & Agilent 8166A Lightwave Multichannel System, Fourth Edition
This chapter explains how to use the Agilent 8163A Lightwave Multimeter or 
Agilent 8164A Lightwave Measurement System to measure Return Loss. 
Here you will find:
• a quick explanation of the terms Return Loss and Insertion Loss,
• a description of how to measure Return Loss and Insertion Loss using the 
HP 81534A Return Loss module, and 
• a detailed explanation of the background to Return Loss measurements using 
the HP 81534A Return Loss module.