| 摘要 |
<p>A flow meter with digital temperature compensation, whose circuit is composed of an operational amplifier, a digital potentiometer, a sensor coil, and several fixed resistors. One end of the sensor coil is connected to the non-inverting input terminal of the operational amplifier, the other end is grounded. A fixed resistor R 1 is connected between the non-inverting input terminal and the output terminal of the operational amplifier, the inverting input terminal of the operational amplifier is connected to one end of the fixed resistor R 2 , R 3 , the other end of the fixed resistor R 2 is connected to the output terminal of the operational amplifier, and the other end of the fixed resistor R 3 is grounded. The connecting end of the fixed resistor R 2 and the output terminal and the inverting input terminal of the operational amplifier are all connected to the high side of the digital potentiometer, the grounded end of the fixed resistor R 3 is connected to the low side of the digital potentiometer, and the inverting input terminal of the operational amplifier is also connected to the sliding end of the digital potentiometer.</p> |
