A Background to Return Loss Measurement Return Loss Measurement
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 173
Measuring the Power Transmitted Through
the Measurement Patchcord
Connect the measurement patch cord (the cable you will use to
connect to the Device Under Test, DUT) directly to a Power Meter and
measure the transmitted power, E
Meas
. You can use E
Meas
to calculate
the front panel delta, see “Calculating the Front Panel Delta” on
page 176 and to calculate the insertion loss, see “Calculating the
Insertion Loss of the DUT” on page 178.
Figure 111 Measuring the Power transmitted through the Measurement Patchcord
Measuring the Reflections from the DUT
Now detach the measurement patchcord from the Power Meter and
attach it to the DUT. The DUT should be terminated.
Figure 112 Measuring the Reflections from the Device Under Test
The instrument measures the power reflected from the DUT. This
power is called P
DUT
.
Power Meter
E
Meas
M
ref
P
ref
Agilent 81610A
Reflection Reference
measurement patchcord
M
dut
P
dut
DUT
Agilent 81610A
Reflection-free
Termination
measurement
patchcord
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