Table of Contents
Advertisement
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 on page 77.
When a calibration that you performed is being interpolated, an asterisk is added to
the Cal annotation. For example:
current Response or Mechanical cal is being interpolated. An
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. For example:
QuickCal is being interpolated. An
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 (except CalReady).
Calibrating in one mode will overwrite calibrations for other 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.
To apply a Cal that was performed in a different mode, press Cal 5 then select
ON.
Save the Calibration
After performing any type of calibration, you can save the FieldFox settings along
with the calibration into a STATE (*.sta) file. These settings and calibration can then
be recalled as necessary. To learn how, see Saving and Recalling Files on page 124.
CalReady Properties
There are several factory CalReady calibrations on every FieldFox. These can be
selected based on the type of DUT that you measure most often, and the
compromise that you prefer to make between measurement speed versus
measurement accuracy. Remember, CalReady was performed at the test ports.
Therefore, a CalReady calibration is most accurate when the DUT is connected to the
test ports. Learn more about CalReady on page 63.
This setting does NOT survive Preset or Power ON/OFF.
Press Cal 5 then
Then
Then choose from:
Calibration for NA, CAT, and VVM Modes
Cal ON
More
CalRdy
– Corrects all four S-parameters. Requires a forward and
Full 2-Port Cal
o
reverse sweep, which causes slower trace measurements. Learn why on page
70.
is shown on the screen when the
Cal ON U*
Q?. is shown on the screen when the current
is never added to CalRdy.
?
is never added to a
*
Cal
75
Advertisement
Chapters
Table of Contents
