Agilent Technologies FieldFox N9912A User Manual page 54

 Press Finish.
 Connect the DUT between the RF OUT and RF IN connectors.
NOTE A Normalization cal will NOT be interpolated if the Resolution or Frequency
range changes.
CAL ON U
measurement.
Interpolation
Highest measurement accuracy is achieved when the measurement type,
frequency range, power level, and resolution settings remain the same during the
measurement as when the FieldFox was calibrated. If these settings change after
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. For example, if frequency settings
change after a Preset Calibration is performed, the Preset Calibration is only
slightly less accurate. Learn more about the relative accuracy of FieldFox
calibrations on page 57.
When a calibration is being interpolated, an asterisk is added to the screen
annotation as follows:
For highest accuracy: a new cal should be performed when the temperature
changes more than about 10°F (5°C), or when the connection to the DUT requires
a different jumper cable or adapters.
How to turn Error Correction OFF
"Error Correction" is applying the results of a calibration to a measurement.
Error Correction is automatically turned ON after a calibration. You could turn
Error Correction OFF in order to see the effects of a calibration on the
measurement.
 Press Cal 5 then
 Then


Cal ON ? – Questionable Accuracy
If a change made by the user to the output power setting, or a change made
automatically by the FieldFox firmware makes accurate calibration interpolation
questionable, a question mark is added to the screen annotation for all
calibration states (Ex:
on how much the setting has changed. For optimum accuracy, recalibrate using
the new settings.
54
is shown on the screen when a Normalization Cal is correcting the
Cal ON*
Error Correction ON
or Esc.
Exit
is shown on the screen when Correction is OFF.
Cal OFF
is shown on the screen when switching from a 1-port measurement
Cal OFF*
to a 2-port measurement or vice-versa. Calibration for the current
measurement has NOT been performed.
Cal ON
OFF.
?). The resulting measurement accuracy depends
N9912A FieldFox User's Guide