Return Loss Measurement Return Loss Measurement
186 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition
Viewing the Calibration Values
The Return Loss module calibration values used are either the most
recently measured, where these are available, or factory default values.
If you are unsure of the calibration values you are using, or if you have
changed your measurement setup, make the appropriate calibration
measurements again.
1 Press [Menu]. Move to the <Show calibration> menu item. The Calibration
parameters screen for the Return Loss Diode appears, as displayed in
Figure 108 . This screen shows current value for the following quantities:
•[Para], the parasitic power value measured by the Return loss Module’s in-
ternal power sensor in dBm. This value is determined by the termination cal-
ibration, or you can use the default setting held in the factory calibration.
•[Ref], the power measured by the Return loss Module’s internal power sen-
sor during the reflectance calibration in dBm
•[Meas], the power currently measured by the Return loss Module’s internal
power sensor in dBm
Figure 108 The Calibration Parameters Screens - Return Loss Diode
2 Press [Next]. The Calibration parameters screen for the Monitor Diode appears,
as displayed in Figure 109 . This screen shows current value for the following
quantities:
•[Para], the parasitic power value measured by the Return Loss module’s
monitor diode in dBm. This value is determined by the termination
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