Other topics about Performing Calibration
The E5071C's frequency offset function allows you to measure any device that has different input and output frequencies. To correct such measurements, you must determine the transmission frequency characteristics at different frequencies.
Scalar-mixer calibration is a method to calculate the transmission frequency characteristics at different frequencies by using a power meter.
You can use the following command to enable the frequency offset function before starting a measurement of scalar-mixer calibration data.
:SENS{1-36}:OFFS
To use scalar-mixer calibration, the frequency offset function must be enabled.
You can use the following commands to set the port on which a measurement of scalar-mixer calibration data is implemented and the type of calibration.
:SENS{1-36}:CORR:OFFS:COLL:METH:SMIX2
:SENS{1-36}:CORR:OFFS:COLL:METH:SOLT1
"SMIX2" will set a scalar-mixer calibration for 2-port forward, reverse and both directions. "SOLT1" will set 1-port calibration.
The two ports specified by "SMIX2" must be different from each other.
The setting of forward, reverse and both directions is not dependent on the order of the two specified ports but determined by specifying an appropriate command for calibration data measurement, such as
:SENS{1-36}:CORR:OFFS:COLL:OPEN
You can use the following command to measure the scalar-mixer calibration data.
:SENS{1-36}:CORR:OFFS:COLL:OPEN
:SENS{1-36}:CORR:OFFS:COLL:SHOR
:SENS{1-36}:CORR:OFFS:COLL:LOAD
:SENS{1-36}:CORR:OFFS:COLL:THRU
You can use the following command to measure power.
:SENS{1-36}:CORR:OFFS:COLL:PMET
Power measurement is required for scalar-mixer calibration, but it is not required for 1-port calibration. The setting for power measurement is the same as for the normal power calibration. For information on power calibration, refer to Power Calibration.
If the needed measurement is completed for the calibration port and type you have selected, use the following command to start calculation of calibration coefficients.
:SENS{1-36}:CORR:OFFS:COLL:SAVE
If the necessary measurement is not completed, an error will occur. Once the calculation of calibration coefficients is completed, the measurement values are cleared despite whether they were used and error correction is turned on automatically.
To turn on or off scalar-mixer error correction, use the following command. This command is commonly used for the normal calibration; scalar-mixer calibration data are enabled while the frequency offset is turned on, and the normal calibration data are enabled while it is turned off.
:SENS{1-36}:CORR:STAT
Once the scalar-mixer calibration coefficient has been calculated, scalar-mixer correction is automatically turned on.
An ECal (Electronic Calibration) module allows you to perform scalar-mixer calibration and 1-port calibration without needing to replace the standard device.
To perform ECal, use one of the following commands:
|
Calibration type |
Command |
|
1-Port Calibration |
:SENS{1-36}:CORR:OFFS:COLL:ECAL:SOLT1 |
|
Scalar-Mixer Calibration |
:SENS{1-36}:CORR:OFFS:COLL:ECAL:SMIX2 |
Simply issuing one of the above commands completes some of the tasks necessary for error correction, including measuring the calibration data, calculating the calibration coefficients, and running the error correction feature. To implement scalar-mixer calibration, you must measure the power in advance. For 1-port calibration, you do not need to do this.
Once ECal has started, you cannot interrupt the operation.
Any command received after ECal has started will not be executed until ECal is completed. In other words, even if you issue a command with a Query, you cannot get the Query response until ECal is finished.