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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
151
Calculating the Insertion Loss of the DUT
Insertion Loss is explained in
“What is Insertion Loss ?” on page 134
To measure the insertion loss you must measure the power transmitted through
the measurement cable, see
“Measuring the Power Transmitted Through the
Measurement Cable” on page 146
and the power transmitted through the DUT,
see
“Measuring the Power Transmitted Through the DUT” on page 147
The equation below gives the insertion loss of the DUT,
IL
DUT
:
IL
D U T
10
–
E
i l
E
Me as
---------------
log
=
(18)