Agilent Technologies 8163A User Guide

A Background to Return Loss Measurement with the HP 81534A Return Loss Measurement
Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave
Multichannel System, Fourth Edition
145
A Background to Return Loss
Measurement with the
HP 81534A
Measuring the Reflected Power from a
Component with Known Reflection Factor
First, attach a component with a known reflection factor in place of the DUT, and
measure the power reflected. This is component is called the reflection reference.
This measured power from the reflection reference is called P
Ref
.
The following two components are recommended for use as a reflection
reference:
• a Reflection Reference Cable or
• the Agilent 81000BR Back Reflector.
NOTE Note you can only measure the Front Panel Delta if you use a Reflection
Reference Cable.
The reflection factor for the component is called R
R
. Normally the return loss for
the component (RL
R
) is specified, but these values are related:
Figure 100 Measuring the Power from a Component with Known Reflection Factor
HP 81534A
P
in
P
r
P
src
P
Ref
Reflection
Reference
k
1
k
2
Reflectivity
R
Ref
RL
R
10 Rlog
R
– 10
P
r
P
in
-------log–==

Agilent Technologies 8163A Specifications

General

Brand	Agilent Technologies
Model	8163A
Category	Measuring Instruments
Language	English