Keysight N9927-90001 User’s Guide 131
Calibration for NA, CAT, and VVM Modes
Select an ECal module that has connectors of the same type and gender as the
DUT. If such an ECal module is not available, a module with connectors
different from the DUT can be used by selecting a User Characterization. This
selection is located on the Mechanical Cal Setup page of the CalWizard.
However, a User Characterization can NOT be PERFORMED using the
FieldFox. It must be performed using a bench top Keysight VNA, such as the
PNA or ENA. Learn more about User Characterization at the PNA Help website:
http://na.support.keysight.com/pna/help/latest/S3_Cals/ECal_User_Charact
erization.htm.
How to Perform a Calibration Using ECal
— Make measurement settings on the FieldFox (frequency range, number of
points, etc.)
— Connect the ECal module USB cable to the FieldFox USB.
— Allow the module to warm up until it indicates READY. This may take several
minutes.
— Connect the ECal module ports to the FieldFox at the calibration reference
plane (where the DUT will be connected).
—Press Cal 5
to start the Calibration.
—Press Mechanical Cal / ECal
—Press Change DUT Connectors. For each test port to be calibrated, select
the Connector Type and Gender of the DUT / ECal module. The connected
ECal module and relevant User Characterizations will appear, with the ECal
factory default as the default Cal Kit.
— Optionally press Advanced
then ECal Auto Orient.
— ON
(default) The FieldFox automatically senses the direction in which
the ECal module ports are connected to the FieldFox ports.
— OFF
If power to the ECal module is too low, it cannot detect which
FieldFox ports it is connected to. If you are having this problem,
select OFF. Then during the calibration, the FieldFox will prompt you
to connect the ECal module ports to specific FieldFox ports.
— Optionally press Advanced
then Extended Cal (N995xA/6xA Only).
— ON
The FieldFox Extended Cal measures additional points outside
the current frequency range in order to enable adjusting the
frequency range after the calibration procedure. With these extra
points, the error correction may be applied when it otherwise might
The frequency range of the measurement MUST be within the frequency
range of the ECal module or an error will appear when “Calculating Steps”
during the calibration.
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