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Calibration Factor and Reflection Coefficient
The Calibration Factor (CF) corrects the frequency response of the sensor.
The Reflection Coefficient (Rho, or ρ) relates to the SWR based on the
following formula:
Typical uncertainties of the CF data are listed in the following tables.
As the U2000 Series USB power sensors have two independent
measurement paths (high and low power paths), there is only one set of
CF data used for both high and low power paths for each sensor. The
uncertainty analysis for the calibration of the sensors was done in
accordance with the ISO Guide. The uncertainty data reported on the
calibration certificate is the expanded uncertainty with a 95% confidence
level and a coverage factor of two.
U2000 Series Operating and Service Guide
ρ
1
+
SWR
=
----------- -
ρ
1
–
Specifications and Characteristics
3
61
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