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Calibration for NA, CAT, and VVM ModesFUTURE
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.
Interpolated Calibrations are only slightly less accurate than a calibration
performed at the measurement settings. Learn more about the relative
accuracy of FieldFox calibrations in
page
When a calibration that you performed is being interpolated, an asterisk is
added to the Cal annotation. For example: Cal ON U* is shown on the screen
when the current Response or Mechanical cal is being interpolated. An * is
never added to a CalRdy.
Cal ON? – Questionable Accuracy
When the Output Power, Interference Rejection, or IF BW (NA Mode ONLY)
setting is changed AFTER performing a calibration, a question mark is added to
the Cal annotation.
The resulting measurement accuracy depends on how much the setting has
changed. For highest accuracy, recalibrate using the new settings.
Compatible Mode Calibrations
The FieldFox can have only ONE calibration present for all modes. Because NA,
CAT, and VVM modes are very similar, a calibration that is performed in one
mode can also be applied in the other modes with the same type of
measurements (1-port or 2-port).
To apply a Cal that was performed in a different mode, press Cal 5 then select
User Cal
142
—
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.
142.
ON.
"Cal ON? – Questionable Accuracy" on
Keysight N9915-90020 User's Guide
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