Keysight N9915-90020 User’s Guide 139
Calibration for NA, CAT, and VVM ModesFUTURE
1-port Response Cals (Open or Short)
Calibrate the magnitude and phase of a measurement using ‘modeled’
mechanical standards. Measurement accuracy is better than Simple
Response Cals (available on the main Cal page - see
“Calibration Type” on
page 136
) but NOT as good as full 1-port cal. Corrects either S11 or S22.
Can be used with Isolation (see following section). Learn more in “Simple
Response Cals” on page 133
.
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.
How to perform the Isolation step
1. Press Cal 5
then Mechanical Cal / ECal
2. Then Advanced
3. Then
Omit Isolation
— OFF Perform the Isolation step
—
ON (default) Omits the Isolation step
4. Then <Back
5. 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.
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