The Multi-Tone System saves time by producing multiple signals during a dwell time. Since the minimum dwell time is defined by the harmonized standards and the cycle time of the EUT, and a large part of the total test time is spent during the dwell, multiple tones executed during each dwell will significantly reduce test time. For example; by generating 6 tones during the dwell there is a test time savings of 82% for a typical IEC 61000-4-3 radiated immunity test to 6 GHz when compared to testing a single tone.