Return Loss Measurement A Background to Return Loss Measurement
172 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
Measuring the Power Transmitted Through
the Reflection Reference
NOTE You can only measure the Front Panel Delta if you use the a Reflection
Reference Cable.
Connect your a Reflection Reference Cable to a Power Meter and
measure the transmitted power, E
ref
. You can use E
ref
to calculate the
front panel delta, see “Calculating the Front Panel Delta” on
page 176.
Figure 109 Measuring the Power transmitted through the Reflection Reference
Measuring the Power when there are No
Reflections
Next, terminate the mesurement patchcord so that there are no
reflections from the end. All the power measured by the sensor now, is
due to the non-ideal nature of the measurement system. This is our
termination parameter.
Figure 110 Measuring the Power with the Connector Terminated
This measured power for the termination parameter is called P
T
.
Power Meter
E
ref
M
ref
P
ref
Reference Cable
Agilent 81610A
P
in
P
r
Reflection Reference
Reflection-free
Termination
= 0
M
ref
P
ref
Agilent 81610A
Reflectivity
P
in
measurement patchcord
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