A Background to Return Loss Measurement Return Loss Measurement
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition 191
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 195 and to calculate
the insertion loss, see “Calculating the Insertion Loss of the DUT” on
page 196.
Figure 114 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 115 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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