The ACM4520 is a fully automatic, USB-controlled and powered electronic calibration module that supports up to 4-port calibration. It reduces manual reconnection steps by presenting factory-characterized calibration standards (Open, Short, Load, Thru) internally. This design minimizes technician error, lowers cable wear, and accelerates the calibration routine. A built-in 20 dB attenuator acts as a “simulated DUT” for confidence checking, and the module can recall its factory-stored DUT to verify calibration integrity.
