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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
147
Front Panel Delta” on page 149
and to calculate the insertion loss, see
“Calculating the Insertion Loss of the DUT” on page 151
Measuring the Reflections from the DUT
Now detach the measurement cable from the Power Meter and attach it to the
DUT. The DUT should be terminated.
The instrument measures the power reflected from the DUT. This power is called
P
DUT
.
Measuring the Power Transmitted
Through the DUT
Unterminate the DUT and connect the DUT to a Power Meter so that the power
that is transmitted through the DUT can be measured. This power is called
E
il
.
You can use
E
il
to calculate the insertion loss, see
“Calculating the Insertion Loss
Figure 103
Measuring the Power Transmitted Through the Measurement Cable
HP 81534A
P
src
Measurement
Cable
Power
Meter
E
Meas
Figure 104
Measuring the Reflections from the Device Under Test
HP 81534A
P
src
P
DUT
Measurement
Cable
DUT
Reflection-free
Termination
Figure 105
Measuring the Reflections from the Device Under Test
HP 81534A
P
src
P
DUT
Measurement
Cable
Reflectivity
R
DUT
DUT
Power
Meter
E
il