Getting Started With Return Loss
Return Loss Measurement
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave
Multichannel System, Fourth Edition
135
Taking Calibration Measurements
Before measuring the reflection factor of a device under test (DUT), take some
calibration measurements. These eliminate wavelength dependencies, coupler
directivity, insertion losses, backscattering and other non-ideal characteristics of
the system.
How to Make Return Loss
Measurements with the
HP 81534A Return Loss
Module
The HP 81534A Return Loss Module includes a power sensor and a coupler in
one module for use in the Agilent 8163A Lightwave Multimeter and
Agilent 8164A Lightwave Measurement System for the making of return loss
measurements.
N O T E
The Agilent 8166A Lightwave Multichannel System does not support the
HP 81534A Return Loss Module.
N O T E
We recommend that you choose an averaging time of 1 second or longer. Press
[Menu], move to <
Averaging Time
>, move to your chosen averaging time, and
press
Enter
.
Calibrating a Reference Cable
The return loss setup described here uses a HP 81553SM source, inserted as a
second module in the same mainframe as the return loss module.
It is recommended that you attach a patchcord to the return loss module output.
C A U T I O N
Agilent Technologies supplies patchcords with a Diamond HMS-10/Agilent/HRL
high return loss connector on one end. These patchcords are necessary so that the
Figure 86
The Contents of the HP 81534A Return Loss Modules
INPUT
SOURCE
OUTPUT 9/125
µ
m
HP 81534A
Reflection-free
Termination
