In comparison with open loop A-type of output signal No. 4 pin, this circuit type produces the output as the absolute DC value through wave rectification of the measured AC current signal.. This enables utilizing of alternating signal modified to the direct current signal. In terms of electrical characteristic, it displays the absolute value on the basis of the effective AC value. Therefore, the error caused by frequency and irregular output signal is converted and used on the basis of the effective value of open loop A-type of output signal No. 4 pin. For reference, output waveform without the attachment of external deposition condenser is as illustrated in the figure.