Keysight N9912A User Manual page 64

 Connect a short, high-quality, phase stable cable between the FieldFox RF OUT
NOTE All subsequent insertion loss measurements are made relative to the insertion loss of
this cable. For example, if you use a Normalization cable with 1 dB of loss, then after
pressing Normalize, the display will show 0 dB of loss with this cable in place.
Therefore, for highest accuracy, when measuring the DUT also attach the cable that
was used in the normalization cal.
 Press
 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 66.
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


64
and RF IN connectors.
then
Start Cal Thru
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 to a
Cal OFF*
2-port measurement or vice-versa. Calibration for the current measurement has
NOT been performed.
then
Measure
OFF.
FieldFox User's Guide