Keysight N9923A, User Manual, Page: 117 / 276

Keysight N9923-90001 User’s Guide
117
Calibration for NA, CAT, and VVM Modes
Standards: OPEN or SHORT on
ONE
port
Sweeps in BOTH directions.
Isolation Step of a 2-Port Cal
The optional isolation step of a calibration corrects for crosstalk which is the
internal signal leakage between the test ports. The Isolation step measures
Load standards that are connected to one or both FieldFox test ports.
Perform an isolation calibration when you are testing a device with high
insertion loss, such as the stop band of a filter or a switch in the open position.
The isolation step can add noise to the error model when the measurement is
very close to the noise floor of the analyzer. To improve measurement
accuracy, set a narrow IF Bandwidth during the calibration.
The Isolation step is NOT allowed with ECal or QuickCal.
How to perform the additional Isolation step
— Press
Cal 5
then
Mechanical Cal / ECal
— Then
Advanced
— Then
Omit Isolation
—
OFF
Perform the Isolation step
—
ON
(default) Omits the Isolation step
— Then
<Back
— Configure and perform the calibration as usual. At the first step of the Cal
you will be prompted to connect a Load standard to one or both test ports.
— This setting survives an Instrument Preset.
Waveguide Calibrations
In general, calibrating with Waveguide is very similar to calibrating with coax.
However, most coax mechanical Cal Kits have standards that can be used over
a very wide frequency range. Waveguide Cal Kits are used over a narrow
frequency range. Therefore, it is VERY IMPORTANT to set the frequency range
of the measurement WITHIN the frequency range of the waveguide Cal Kit.
Otherwise, an error message will appear during the ‘Calculating Steps’ portion
of the calibration.
If the first calibration step does NOT prompt you to connect Load
standards, then the Cal Kit probably does not contain an Isolation
standard. You can use DataLink software to edit the Cal Kit and add an
isolation standard using a Load standard. See Data Link Help for more
information:
http://na.support.keysight.com/help/DataLinkHelp/DataLink.htm