Agilent Technologies 8163A - Measuring the Reflections from the DUT; Measuring the Power Transmitted through the DUT

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
of the DUT” on page 151.
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
Term in a tion
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