This is the distortion of the voltage waveform by
the power conditioner (making it appear jagged rather than smooth). The
less distortion added the better. Voltage regulators that
operate by switching taps (tap changing), particularly electronic
voltage regulators, can cause a phenomena known as "notching". If the
waveform is not at zero (the point where it crosses the horizontal
axis) when the regulator changes taps, then the output voltage waveform
will be distorted. |