Interpolating compensation method for each-band calibration of network analyzer

Abstract

The invention provides an interpolating compensation method for each-band calibration of a network analyzer. The method comprises the following steps of 1, saving the current setting state, influencing the calibration effect, of the apparatus; 2, measuring a standard part and executing calibration; 3, obtaining an error coefficient through calculation; 4, judging whether the measuring state is changed, if yes, entering calibration interpolating data processing flow and generating a new error coefficient array; if not, directly entering the step 5; 5, measuring a measured piece, connecting the measured piece, and executing measurement; 6, correcting the errors, extracting the error coefficient from the error coefficient array, selecting a suitable error model according to the different calibration methods, and solving a function to obtain a true value of the measured piece through measurement data and the error coefficient; 7, judging whether measurement is completed, and if yes, finishing a program; if not, returning to step 4. By means of the scheme, a suitable interpolation algorithm is utilized to calculate the error coefficient of a non-calibration point, so that error correction is completed.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a sub-band calibration, interpolation and compensation method for a network analyzer. Background technique [0002] Compared with other instruments, the most complex and complete feature of the vector network analyzer is that it has the error correction function. It uses software to make up for the lack of hardware design. By establishing a suitable error model, the calibration is completed using calibration parts with known characteristics. , thus greatly improving the measurement accuracy of the system. [0003] Calibration is a very demanding process. Even the strength of connecting the calibration parts will affect the final test accuracy. Generally speaking, it is not allowed to change the state of the instrument after calibration. After changing the state, it must be recalibrated. However, for the special requirements of some users, such as wanting to measure D...

AI Technical Summary

Problems solved by technology

However, for the special requirements of some users, such as wanting to measure DUTs in different frequency bands at the same time, the requirements for measurement results are not particularly high, but the requirements for measurement efficiency are high, and it is not suitable for multiple calibrations. The current solution is to use similar The error coefficient of the point to complete the error correction or simple interpolation of the calibration data

Using similar points for error correction is likely to cause interpolation errors because the similar points span bands; and the simple interpolation method that only considers the calibration data and does not consider the factors that cause interpolation errors will also have unsatisfactory or even incorrect interpolation results. Happening

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