Other topics about Performing Calibration
The E5071C lets you perform power calibration by using a power meter to output a more accurate power level.
The E5071C performs power calibration by controlling the power meter via GPIB. Therefore, you need to connect the E5071C and the power meter by using the USB/GPIB interface.
Use the following command to select the type of GPIB or USB enabled power meter:
:SYST:COMM:PSENsor
Use the following command to set the GPIB address of the power meter to the E5071C.
:SYST:COMM:GPIB:PMET:ADDR
Before performing power calibration, set the reference calibration factor (the calibration factor at 50 MHz) and the calibration factor for each frequency depending on the power sensor you use.
Depending on the combination of power meter and power sensor that you use, the power sensor calibration factor table may be set automatically by the power meter. In this case, do not set the calibration factor table with the E5071C.
To set the reference calibration factor of the power sensor, use the following commands:
|
Channel A |
:SOUR:POW:PORT:CORR:COLL:ASEN:RCF |
|
Channel B |
:SOUR:POW:PORT:CORR:COLL:BSEN:RCF |
To set the calibration factor table of the power sensor for each frequency, use the following commands:
|
Channel A |
:SOUR:POW:PORT:CORR:COLL:TABL:ASEN:DATA |
|
Channel B |
:SOUR:POW:PORT:CORR:COLL:TABL:BSEN:DATA |
Alternatively, you can configure the power sensor calibration factor table based on the data contained in a CSV file by issuing the following commands:
|
Channel A |
:MMEM:LOAD:ASCF |
|
Channel B |
:MMEM:LOAD:BSCF |
Also, you can save the contents of the current power sensor calibration factor table to a file by issuing the following commands:
|
Channel A |
:MMEM:STOR:ASCF |
|
Channel B |
:MMEM:STOR:BSCF |
For more information on saving/recalling the power sensor calibration factor table, refer to Saving/recalling Power Sensor Calibration Factor Table.
You can perform loss compensation by setting in advance the power loss due to the difference in connections (cables, adapters, etc.) between the when the power calibration data are measured and when the actual DUTs are measured.
To set the loss compensation table for each frequency, use the following command:
:SOUR{1-36}:POW:PORT{1-4}:CORR:COLL:TABL:LOSS:DATA
Alternatively, you can configure the loss compensation table based on the data contained in a CSV file by issuing the following command:
:MMEM:LOAD:PLOS{1-4}
Also, you can save the contents of the current loss compensation table to a file by issuing the following command:
:MMEM:STOR:PLOS{1-4}
To turn on or off the loss compensation, use the following command:
:SOUR{1-36}:POW:PORT{1-4}:CORR:COLL:TABL:LOSS
Before measuring power calibration data, you need to execute zero adjustment and calibration of the power sensor. For information on how to perform these procedures, refer to the operation manual of the power meter you are using.
When using the power sensor calibration factor table of the E5071C, set the reference calibration factor of the power meter to 100% when calibrating the power sensor.
To set the number of power calibration data measurements at one measurement point (averaging factor), use the following command:
:SOUR{1-36}:POW:PORT{1-4}:CORR:COLL:AVER
To set a tolerance for power calibration, use the following command:
:SOUR{1-36}:POW:PORT{1-4}:CORR:COLL:NTOL
When a tolerance for power calibration is set, if the measured value does not fall within the tolerance, even after measurement is performed during power calibration the number of times specified by the averaging factor, an error message is displayed and the power calibration is aborted. In this case, the power correction is not turned on.
To measure the power calibration data, use the following command. When the measurement is complete, the power calibration is automatically turned on.
:SOUR{1-36}:POW:PORT{1-4}:CORR:COLL
If you issue another command during the measurement of the power calibration data by the above command, the measurement may be aborted. Therefore, when you write a program that issues multiple calibration commands in series, you should use the *OPC or some other means to ensure that no command is executed before the preceding command completes itself.
To turn on or off the power-level error correction, use the following command:
:SOUR{1-36}:POW:PORT{1-4}:CORR
When the power calibration data measurement initiated with the :SOUR{1-36}:POW:PORT{1-4}:CORR:COLL command is complete, the power calibration is automatically turned on.
The power calibration data array contains data used to perform error correction for the power level at each measurement point (values obtained by subtracting the value actually measured with the power meter from the set power level value when measuring power calibration data at each measurement point).
The number of power calibration data arrays that are assigned to individual ports of individual channels can be up to 64 (16x4). To read/write one of the power calibration data arrays, use the following command:
:SOUR{1-36}:POW:PORT{1-4}:CORR:DATA