To calibrate the fixture to the C reference planes, the mid-section should be replaced with calibration standards, preferably using short-open-load-thru
(SOLT) below 5 0Hz and thru-reflect-line (TRL) above.
If a TRL calibration is performed instead of a short-open-load-thru
(SOLT) procedure, the only standard needed is a delay line.
This article describes several types of calibration procedures, including short-open-load-thru
(SOLT) and thru-reflect-line (TRL).
In addition to the adapter-removal method, the model HP 8753E performs full two-port calibration with short-open-load-thru
standards (the most accurate method for the model HP 8753E) and thru-reflect-line ([TRL.
In actual practice, it is relatively easy to obtain good calibrations to 50 GHz using the TRL methods, much easier than short-open-load-thru
(SOLT) methods, for example.
In reproducing the results, it was found further that a VNA calibrated using thru-reflect-line (TRL) calibration generally agreed with the scalar analyzer results, but the same VNA calibrated with a short-open-load-thru
(SOLT) calibration did not.