Copper Mountain ACM8000T is an Automatic Calibration Module (ACM) designed for full one-port and two-port calibrations of vector network analyzers from Copper Mountain Technologies. It operates in the frequency range from 300 kHz to 8 GHz. For lower frequencies, the ACM6000T operates up to 6 GHz. The ACM calibrates any CMT VNA in fully automatic mode through the built-in functions of the analyzer software. The ACM switches to the impedance states one by one in the process of calibration. The VNA calibration coefficients are calculated using the measured S-parameters of the ACM impedance states and the data stored in the ACM memory.