| 摘要 |
PURPOSE:To adjust the zero point independently of span, by supplying the zero point adjusting voltage to the inverting input terminal of an opertional amplifier via an input resistor and connecting a resistor between the inverting input terminal and ground. CONSTITUTION:An input signal voltage e1 is fed to the noninverting input terminal of an operational amplifier OP, the zero point adjusting voltage es is divided at voltage dividing resistors r1, r2 and fed to the inverting input terminal of the amplifier OP via a resistor r3. Further, between the output terminal and the inverting input terminal of the amplifier OP, a resistor r4 is connected and a resistor R is connected between this terminal and ground. With such a circuit constitution, the zero point can be adjusted independently of the span which changes the voltage es. Further, by making smaller the resistor R, the gain can easily be increased, and the effect to the output signal voltage can be made minute with the zero point adjustment to avoid the mutual interference between the span and the zero shift. |
