SIGNAL CONVERTING CIRCUIT

摘要

PURPOSE:To eliminate the mutual interference of a zero adjustment and span adjustment by switching the dividing ratio of the multipliers of two systems by the same value and by changing both relatively a feedback voltage and zero adjustment voltage. CONSTITUTION:A rate multiplier RM1 and another rate multiplier RM2 are provided and a fixed reference frequency fr is impressed from an oscillator OSC to the multiplier RM2. The same dividing ratio of the dividing ratio K deciding a span by a digital setter DSR is set to the multiplier RM2. The mutual interference of the span adjustment and zero adjustment is eliminated by making the zero adjustment voltage a voltage ez with impressing the frequency output corresponding to the dividing ratio thereof on the switch SW2turning on/off the partial pressure voltage of a reference voltage er via a pulse width circuit PW2.