Can you calibrate a 4-port VNA with only a 2-port ACM? Whether it’s for cost savings or because of what is available, 4-port calibration with a 2-port calibration kit is possible. With a 2-port automatic calibration module (ACM) it isn’t much more difficult or time consuming than calibrating with a 4-port ACM. And even better, it’s still as accurate as calibrating with a 4-port ACM! Copper Mountain Technologies’ Rick Hollowell, Director of Sales for US and Canada, shows how to easily calibrate a CMT Cobalt 4-port VNA with a 2-port ACM.