Partial Overwrite; Procedure - Agilent Technologies ENA Series User Manual

Partial overwrite

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.
NOTE
When the calibration coefficients become inappropriate over time or the status on the
E5070B/E5071B side from the calibration surface changes due to replacement of a cable or
connector, you need to also perform thru measurement when partial overwite is required
for reflection or isolation measurement.
NOTE 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.
Step 1. Press
re-calibration.
Step 2. Press
Step 3. Press
Step 4. Press
Step 5. Press
Step 6. 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.)
Softkey
1-2
1-3
1-4
2-3
2-4
3-4
Chapter 4
or
.
.
Calibrate
.
2-Port Cal
.
Select Ports
Function
Selects test ports 1 and 2.
Selects test ports 1 and 3.
Selects test ports 1 and 4.
Selects test ports 2 and 3.
Selects test ports 2 and 4.
Selects test ports 3 and 4.
to select the channel for which you want to execute
Calibration
Partial overwrite
151