Electronic Calibration Module (ECal), DC-4 GHz, 2-Port
N7550A - Keysight Technologies
The N7550A is part of Keysight’s family of value-line electronic calibration (ECal) modules that makes calibration of vector network analyzers fast, easy and accurate. Cut your calibration down to half the time it normally takes using a traditional mechanical cal kit. Simply connect it to your instrument and the firmware does the rest. For greater precision and higher accuracy measurements consider the N44xx and N469x family of ECal products.