To assist the operator, the instrument will automatically calculate the optimum
frequency to be selected for larger loads. The load independent, symmetrical
output waveform avoids the potentially destructive space charge effects caused
by DC polarization that occurs in aged extruded cables such as XLPE, PE, EPR,
causing them to fail prematurely when exposed to conventional high voltage DC or
from test instrument with large non-symmetrical output waveforms. Should a
breakdown occur during testing, the actual voltage at which it occurred is
displayed and recorded.