Keysight N9927-90001 User’s Guide 137
Calibration for NA, CAT, and VVM Modes
DUT: Non-Insertable or Insertable
S-parameters Corrected: S11 or S22
Standards: OPEN or SHORT on ONE port
Sweeps in BOTH directions.
Isolation Step
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 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
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
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