Return Loss Measurement Getting Started With Return Loss
150 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
Equipment required
Return Loss and Insertion Loss can be measured in several ways. The
method used by the Agilent 8161x series Return Loss modules
requires the following equipment:
• An Agilent 81610A Return Loss module (where an internal source is
not present), or an Agilent 81611A, 81612A, 81613A or 81614A
Return Loss module (where an internal source is present).
• If the Return Loss module does not include an internal source, or
you choose to use an external source, a Laser Source module.
NOTE If you are using an HP 81534A Return Loss Module, it is important
that the Laser Source has a stable output. Agilent 8161x Return
Loss modules include a monitor diode to compensate for power
variation in the Laser Source.
•A Power Meter.
A typical setup, using an Agilent 81610A Return Loss module, where
the DUT is a connector pair, is described in Figure 83.
Figure 83 Measuring Return Loss and Insertion Loss
To measure insertion loss you measure the power transmitted through
the DUT, see “How to Measure Return Loss and Insertion Loss” on
page 166
How to Choose a Light Source
Highly accurate return loss measurement requires that you use a light
source with a subset of the following properties:
• low coherence length
•high power
• [and, for the HP 81534A, power stability.]
M
il
DUT
Power Meter
E
il
Agilent 81610A
Reflectivity
R
DUT
External Laser
Source
patchcord
physical contact
Agilent 81113PC
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