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7
Return Loss Measurement
208
The constant s is a multiplier giving the scattering factor. The scattering
factor accounts for the directivity of the second coupler, backscatter in the
fiber, and reflections of connectors. The calibration procedure helps you to
eliminate the affect of these on return loss measurements.
For
Return Loss Measurement
component is known. Here we refer to the reflection factor as R
gives the following equation:
P
Ref
For
Measuring the Power when there are No Reflections
value of the reflection factor is zero. This gives the following equation:
For
Measuring the Reflections from the DUT
reflection factor of the DUT is called R
equation:
P
DUT
If we substitute equation 3 into equations 2 and 4, this gives us the
following two equations:
P
Ref
P
=
DUT
If we subtract P
from equations 5 and 6, this gives us the following
para
equations:
on page 184, the reflection factor of the
=
c
M
R
+
1
Ref
Ref
P
=
c
M
para
2
para
on page 206, the value of the
. This gives the following
DUT
=
c
M
R
1
DUT
DUT
M
-------------- - P
=
c
M
R
+
1
Ref
Ref
M
c
M
R
+
1
DUT
DUT
8163A/B, 8164A/B, 8166A/B User's Guide
. This
Ref
(2)
c
M
2
Ref
on page 205, the
(3)
(4)
+
c
M
2
DUT
ref
(5)
para
para
M
DUT
(6)
-------------- - P
para
M
para
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