Calibration Kit Model Which One to Use 8720/8753 or Modern One?

Frequently Asked Questions (FAQs)SummarySometimes, for old cal kit there are two possible definitions one provided with the old cal kit and the modern one available on the websiteQuestionCalibration Kit Model Which One to Use 8720/8753 or Modern One?AnswerRemember that the 8720 (and 8753) series of VNA’s used a simplified version of the cal kit definitions where they did not use L terms.   Because of that some of the other coef’s such as delay or the C terms were adjusted to compensate as best as possible.   Modern VNA definitions are more accurate than the 8720 definitions.   Also there is a chance that changes or improvements happened over time, so it's always a good thing to trust the modern VNA ones for that reason as well.