Tel: 886.2.2175 2930 Email: [email protected]
www.salukitec.com
192
7.
Calibration
Calibration can help to reduce the measurement error. This chapter includes the following contents:
Calibration overview
Selection of calibration type
Calibration guide
High-accuracy measurement calibration
Measurement error
Editing of calibration kit definition
Calibration standards
TRL calibration
Fixture compensation calibration
Electronic calibration
7.1.
Calibration Overview
Measurement calibration is a process to determine the system errors according to the standards of the existing measurement
characteristics and then eliminate the influence of system errors during measurement of the tested device. It can help to reduce the
measurement error and improve the measurement accuracy of the analyzer.
7.1.1.
Definition of Calibration
Calibration is a process to eliminate one or more system error(s) with the error model. The error item of the error model is solved by
measurement according to high-quality calibration standards (including the open-circuit device, short-circuit device, load and through
type part). See system error details in "7.5.3 System Error" of "7.5 Measurement Error" in this chapter.
Select the appropriate calibration method according to the measurement type and accuracy requirements. See details in "7.2
Selection of Calibration Type".
Various kinds of calibration can be done according to the calibration guide of the calibration. See details in "7.3 Calibration Guide".
The measurement accuracy after calibration depends on the quality of the calibration standard and the model definition accuracy of
the standard calibration kit in the calibration kit definition file. The calibration kit definition file is saved in the analyzer. In order to
ensure the measurement accuracy, the actual calibration kit must conform to the requirements of the calibration kit definition file. See
accurate calibration details in "7.4 High- accuracy Measurement Calibration".
The user must correctly define the calibration standard in the calibration kit definition file of the user so as to use the custom
calibration kit (e.g. for fixture measurement calibration). See details in "7.6 Editing of Calibration Kit Definition".
7.1.2.
Significance of Calibration
It is impossible to make an ideal analyzer requiring no error correction from the perspective of hardware circuit. Even if error correction
can be ignored in good hardware circuits, the costs will be high. In addition, the measurement accuracy of the analyzer is largely
influenced by external accessories. The amplitude and phase changes of test components such as the connecting cable and adapter
will affect response the real response of the tested device. Therefore, the best method is to balance the hardware performance and
cost, make high-quality hardware as practical as possible and improve the measurement accuracy by calibration.
7.1.3.
Applications of Calibration
High measurement accuracy is expected.
