Keysight N9923A, Руководство пользователя, Страница: 119 / 276

Keysight N9923-90001 User’s Guide
119
Calibration for NA, CAT, and VVM Modes
— Under
Transform Stimulus Settings
, set the
Start
and
Stop
frequencies to
those of the Waveguide.
— Set
Stimulus = Bandpass Impulse
— Press Meas Setup 4 or Back
— Then
Calibration Settings
— Set Media = Waveguide
— Set Cutoff Frequency . This is the absolute minimum frequency of the
waveguide. This value must be less than the Start Frequency of the
Waveguide.
Enter the calculated
Effective VF
value into the Velocity Factor setting.
Enhanced Response Optimization
When Enhanced Response Cal Type is selected, either for one calibration or for
CalReady, this setting optimizes the calibration based on the type of DUT
being measured. See also: CalReady Properties in
“CalReady” on page 104
.
This setting does NOT survive Preset.
— Press
Cal 5
then
More
— Then
Enh.Response
— Then choose from:
—
NonReciprocal
(default) An amplifier is a Non-Reciprocal device
because it has gain in the forward direction, and very high loss
(isolation) in the reverse direction. This choice provides the best
correction for non-reciprocal devices, and reasonable correction for
reciprocal devices.
—
Reciprocal
A reciprocal DUT is a device in which the insertion loss
through the device is equal in both the forward (S21) and reverse
(S12) directions. A cable is a reciprocal device. This choice provides
the best correction for reciprocal devices. However, S11
measurements on non-reciprocal devices will appear to have more
return loss than the non-reciprocal choice.
Interpolation *
Highest measurement accuracy is achieved when the frequency range or
resolution settings remain the same during the measurement as when the
FieldFox was calibrated. If these settings change after performing a calibration,
the FieldFox will interpolate the calibration so that VERY accurate
measurements continue to be made.