| 摘要 |
PURPOSE:To improve the performance of a photometer by using a unipolar divider by shifting the zero point of an output signal by a bias voltage, bearing a constant relation, applied between the input and output of a unipolar output operator. CONSTITUTION:To a voltage applied to sample-side signal input terminal 7, a bias voltage voltage-divided by variable resistor 9 is added by an adder consisting of resistance 10 and operational amplifier 11 and the sum signal is applied to dividend input terminal 13 of divider 14. A voltage, input to comparison-side signal input terminal 8, is applied as it is to divisor input terminal 12 of divider 14, divides the voltage applied to terminal 13 by that to terminal 12, so that a voltage with a temporary zero point shifted by the bias voltage will be developed at output terminal 15. To the output voltage of divider 14, a bias voltage of the opposite polarity to that of resistor 9 composed of variable resistor 18 is added by an adder consisting of resistance 16 and operational amplifier 17, thereby outputting a signal with a right zero point to output terminal 19 of this unit. |
