A Background To Return Loss Measurement; Measuring The Reflected Power From A Component With Known Reflection Factor; Figure 111 Measuring The Power From A Component With A Known - Agilent Technologies 8163A Manual

A Background to Return Loss Measurement

NOTE
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition
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A Background to Return Loss
Measurement
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 component is called the
reflection reference.
Agilent 81610A
P
ref
Figure 111 Measuring the Power from a Component with a Known Reflection Factor
This measured power from the reflection reference is called P
The following two components are recommended for use as a reflection
reference:
• the Agilent 81610CC Reference Cable, or
• the Agilent 81000BR Back Reflector.
You can only measure the Front Panel Delta if you use a Reflection
Reference Cable.
The reflection factor for the component is called R
loss for the component (RL
M
ref
) is specified, but these values are related:
R
Return Loss Measurement
Reflection
Reference
P
r
Reflectivity
R
ref
P
in
.
Ref
. Normally the return
R
189