Dirty power (Noise) is any electrical current or specific voltage that varies. Dirty power from a medical device perspective is power that is: * Always as the exact voltage (120 VAC in the US) * Does not vary by more than 10% with a Load versus a No Load condition * For AC waveforms, always at the specific Hertz (60 Hz in the US; 50 Hz overseas) * The AC waveform looks 100% consistent like a sine wave. If any deviations or irregularities spotted on the waveform may result in slightly erratic behavior in electronic components causing dirty (unregulated) power. This distortion (Noise) of the pure sine wave, or alternating current, from a utility company may be caused by line switching, radio transmitters, manufacturing equipment, and/or line voltage fluctuations from various so