Other topics about Calibration
Perform the fixture compensation as follows:
Fixture compensation consists of two compensation data acquisition processes: OPEN and SHORT, but you do not need to obtain all the compensation data when you perform fixture compensation. Each type of compensation data can be turned on or off independently for measurement. For normal measurement, it is recommended that you perform fixture OPEN compensation and fixture SHORT compensation.
Ensure that the calibration is turned on in accordance to Calibration of Open/Short/Load/Low-loss Capacitor.
Press the Cal key to display the Calibration Menu.
Press Fixture Compen to display the Fixture Compensation Menu.
If required, set user-defined standard values in accordance with Defining the Standard Values for Fixture Compensation.
When you complete the changes, press Return to return to the Fixture Compensation Menu.
Put the test fixture's device contacts in the OPEN state.
Refer to the operation manual furnished with each test fixture for more information on the OPEN state of the test fixture. Generally, the OPEN state can be made by connecting no device to the device contacts. If the distance between the HIGH electrode and the LOW electrode can be adjusted for a test fixture, keep the same distance as when the test device is inserted between the electrodes.
Press Open to start OPEN compensation data measurement. When OPEN compensation data measurement is completed, OPEN compensation is automatically turned ON.
Put the test fixture's device contacts in the SHORT state.
Refer to the operation manual furnished with each test fixture for more information on the SHORT state of the test fixture. Generally, the SHORT state can be made by connecting a high conductivity metal (shorting bar) to the device contacts or by shorting the HIGH electrode and LOW electrode directly.
Press Short to start SHORT compensation data measurement. When SHORT compensation data measurement is completed, SHORT compensation is automatically turned ON.
The fixture compensation function is automatically turned On after completing each compensation data measurement. However, you can turn the function ON or OFF as required.
Press Cal > Fixture Compen to bring up the Fixture Compensation Menu.
Toggle between ON|OFF at OPEN and SHORT to make each fixture compensation valid (ON) or invalid (OFF) for the measurement.
You can define standard values of OPEN and SHORT for fixture compensation. Figure below shows the circuit models of the fixture compensation kit used for the Keysight E4991B. In addition, the offset electrical delay from the compensation plane to the circuit model can be defined for each compensation's standard.
Each calibration’s standard value can be confirmed and changed as follows:
Press the Cal > Fixture Compen > Define Value to display the Compensation Data Definition Menu.
Select one of the calibration data definition keys, Open Conduct (G), Open Cap (C), Open Offset Delay,Short Resist (R) , Short Induct (L) or Short Offset Delay, to confirm or set the compensation data definition.
Enter the desired value to specify the compensation data definition.