Return Loss Measurement A Background to Return Loss Measurement
178 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
When you enter a value for the Front Panel Delta, <FPDelta>, the
instrument automatically performs the following calculation:
Calculating the Insertion Loss of the DUT
Insertion Loss is explained in “What is Insertion Loss?” on page 149.
To measure the insertion loss you must measure the power
transmitted through the measurement cable, see “Measuring the
Power Transmitted Through the Measurement Patchcord” on
page 173 and the power transmitted through the DUT, see “Measuring
the Power Transmitted Through the DUT” on page 174.
The equation below gives the insertion loss of the DUT, IL
DUT
:
RL RL
DUT
2∆L+=
(17)
IL
DUT
10–
E
il
E
Meas
------- --------log=
(18)
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