Standard and recommended practices for ensuring the quality of measured data for high-frequency electrical interconnect at frequencies up to 50 GHz are provided. This might include, but is not limited to recommending design of test fixtures, as well as methods and processes for ensuring the accuracy and consistency of measured data for signals with frequency content up to 50 GHz. The standard and general practice should be applicable for frequencies higher than 50 GHz as well. The methods and techniques contained herein have been validated only to 50 GHz as of this writing. (This standard incorporates open source. See https://opensource.ieee.org/elec-char/ieee-370/)