Return Loss Measurement Getting Started With Return Loss
166 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth 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 or 81613A 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.
• A Power Meter.
A typical setup, using an Agilent 81610A Return Loss module, where the
DUT is a connector pair, is described in Figure 84 .
Figure 84 Measuring Return Loss and Insertion Loss
To measure insertion loss you measure the power transmitted through the
DUT, see “How to Measure Return Loss” on page 184
If you are using an 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.
NOTE
M
il
DUT
Power Meter
E
il
Agilent 81610A
Reflectivity
R
DUT
External Laser
Source
patchcord
physical contact
Agilent 81113PC
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