The Return Loss Application Applications
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 263
Measuring Return Loss and Insertion Loss
To measure return loss and insertion loss insert a Return Loss module
and a Power Sensor module into the Agilent 8163A/B Lightwave
Multimeter. Connect the Return Loss Module to the Power Sensor
Module via the Device Under Test (DUT). Both values are shown
simultaneously on the display depending on the calibartion and
configuration status. You can freeze the measurement values during
measurement either by pressing the “Hold/Cnt” softkey or by using a
foot pedal if this option has been enabled via the “Config” hardkey.
(See “How to Configure your Foot Pedal” on page 67 for further
details). For general information on measuring return loss and
insertion loss, please refer to“Return Loss Measurement” on page 147.
NOTE The Return Loss Application always uses the first available power
meter channel on dual power meters.
On-Screen Messages
Configuration
The Return Loss Application can be configured according to your
measurement requirements. The following paramters can be
configured:
• the tool used for reflection calibration (reference reflector or
reference cable)
• the return loss reference value RLref of the reflector device
•the averaging time
• the wavelength of the return loss module.
Table 16 Return Loss Application On-Screen Messages
Agilent 8163A/B
Message
Description
Hold
Either the Hold/Cnt Softkey or the foot pedal have been
pressed to freeze the measurement value
UnCal
Application has not performed a calibration cycle with select-
ed wavelength. If dual wavelength is selected, at least one
wavelength is uncalibrated.
NoH
There is an Optical Head Interface module inserted in the
mainframe that does not have an Optical Head connected to
it. No measurement is possible using this channel until you
reconnect an optical head
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