Other topics about Advanced Calibration
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.
Follow these steps to execute the partial overwrite function. The example demonstrates re-calibration for full 2-port thru calibration.
Press Channel Next/Channel Prev keys to select the channel for which you want to perform the calibration.
Press Cal key.
Click Calibrate > 2-Port Cal > Select Ports.
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.)
Click Transmission.
Make a thru connection between selected test ports x and y (between the connectors to which the DUT is connected).
Click Port x-y Thru (x and y are the thru-connected port numbers) to start the re-measurement of the calibration standard.
Click Return.
Click Overwrite to finish the re-calibration for the full 2-port calibration. At this point, the calibration coefficients are re-calculated and saved.
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