Chapter 4 37
Preparation for Accurate Measurement (Executing Compensation)
Executing OPEN/SHORT/LOAD Compensation
4. Preparation for
Accurate Measurement
(Executing Compensation)
Reading/writing compensation data (saving/recalling compensation
conditions)
After saving the compensation conditions to a file, you can recall these conditions on the
4288A at any time from the file.
The compensation data is set up in the parameter-oriented format shown in the table below:
To read/write the compensation data, use the following command.
• :CORR:DATA on page 158
The compensation data written using the above command is handled as follows:
• Saved as the compensation data for the measurement frequency specified when the
command is executed.
• Saved as the data for normal operation when the multi-compensation function is OFF
and as the data for the multi-compensation when it is ON (for the channel that has been
selected at execution).
NOTE When you write compensation data, note the following:
• Before writing, recall the settings of the measurement frequency, cable length, and
frequency shift (for 1 MHz) specified when the data was read.
• For the LOAD compensation data, in addition to the above, you also need to recall the
settings of the LOAD compensation standard (definition value and parameter type)
specified when the data was read.
• Turn ON the compensation function. (Unlike when measuring the compensation data,
writing the compensation data does not automatically turn this function ON.)
Avoiding work-related mistakes in measuring compensation data
To avoid simple mistakes related to work when measuring compensation data (for
example, setting up the OPEN state and SHORT state inversely), it is important to confirm
that the measured data has a proper value.
If a measured value is not proper during measurement of the compensation data, a warning
message appears on the display. However, the occurrence of a warning message cannot be
detected through GPIB. Therefore, to detect erroneous compensation data through GPIB,
you need to read out the compensation data after each measurement and then confirm that
the value is appropriate.
Type of compensation Parameter format
OPEN compensation
G-B or Cp-G
(select with the :CORR:CKIT:STAN1:FORM command)
SHORT compensation
R-X or Ls-Rs
(select with the :CORR:CKIT:STAN2:FORM command)
LOAD compensation
Parameter format to define the LOAD compensation standard
(select with the :CORR:CKIT:STAN3:FORM command)
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