Multi-tone testing has many benefits. While the multitone methodology was initially proposed for Radiated Immunity (RI) testing to the IEC specifications, it also applies to Conducted Immunity (CI) testing to the IEC, Medical, Military and Automotive standards. As is similar for Radiated Immunity testing, it is found to significantly increase the speed of CI testing, as well as improving equipment efficiency, offering greater flexibility to truly test the equipment under test (EUT) to real world threat conditions, and it can be fully compliant to standards. The implementation of multi-tone testing can offer a significant capacity increase to a testing laboratory.