Measurement
217
Partial Overwrite Calibration
• Overview
• Procedure
Other topics about Advanced Calibration
Overview
The partial overwrite function is used to perform partial measurement after
the execution of calibration, and it overwrites the calibration coefficients.
There are three types of calibration coefficients: Er, Es, Ed for reflection, Et
for transmission, and Ex for isolation. If some of them do not provide
satisfactory calibration, you can use this function to re-calculate the
calibration coefficients by measuring an applicable standard only instead of
measuring all standards again.
• When the calibration coefficients become inappropriate over
time or the status on the E5071C side from the calibration
surface changes due to replacement of a cable or connector,
you need to also perform thru measurement when partial
overwrite is required for reflection or isolation measurement.
• The adapter removal and partial overwrite function is only
available when calibration status is [Corr] and not for [C?] or
[C!].
Partial overwrite is not available if no calibration has been done.
You cannot append calibration coefficients to previous
calibrations. For example, you cannot realize full 4-port
calibration by performing additional calibration for 1 port after
the execution of full 3-port calibration. The partial overwrite
function is used to make measurements for previous calibration
coefficients and overwrite them.
Procedure
Follow these steps to execute the partial overwrite function. The example
demonstrates re-calibration for full 2-port thru calibration.
1. Press Channel Next/Channel Prev keys to select the channel for which
you want to perform the calibration.
2. Press Cal key.
3. Click Calibrate > 2-Port Cal > Select Ports.
4. Select the test ports for which you want to perform re-calibration for
full 2-port calibration. (In the following procedure, the test ports you
select are expressed as test ports x and y.)
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