Return Loss Measurement Return Loss Measurement
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 157
P
ref
is the power in the measurement path when making a reference
calibration.
P
para
is the power in the measurement path when making a
terminated/parasitics calibration.
M
ref
is the power at the source monitor diode when making a reference
calibration.
M
para
is power at the source monitor diode when making a
terminated/parasitics calibration
RL
ref
is the return loss reference value set by the user for the reference
calibration
These T-Values are made available using the “Show Calibration” menu
item, or using the GPIB query -
SENSe[n]:[CHANnel[m]]:RETurnloss:CALibration:VALUES?
Calibrating the Return Loss Module
Whenever a Return Loss module is in the mainframe, a return loss
value is displayed. The calibration values used are either the most
recently measured, where these are available, or factory default
values.
If you are unsure of any of the calibration values that you are using, or
if you have changed the measurement setup, take the appropriate
calibration measurements again.
• First, calibrate the return loss module against a component of
known reflectance.
– The Agilent 81000BR Reference Reflector allows you to make a
Reflectance Calibration and a Termination Calibration.
These procedures are decribed in “Calibration using the Agilent
81000BR Reference Reflector” on page 158.
– The Agilent 81610CC Reference Cable also allows you to make a
Reflectance Calibration. Use the measurement patchcord to make
a Termination Calibration.
To measure insertion loss and the front panel delta of the system
(see “Calculating the Front Panel Delta” on page 176), you must
also measure the insertion loss of the Reference Cable and
mesurement patchcord.
These procedures are decribed in “Calibration using the Agilent
81610CC Reference Cable” on page 161.
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