本文给出用41/2位的袖珍式数字万用表实现传感器电信号检测的方法、电路及软件框图.由于传感器电压信号直接由万用表的表笔输入,在表内实现模拟放大和A/D转换,因而有较高的精度和抗干扰性能,此外通过万用表的不同量程,可方便地与各类电压、电流和电阻型传感器配接,并且检测结果可直接送计算机处理. In this paper, the method, circuit and software block diagram of the sensor electrical signal detection with 41/2 bit digital multimeter are presented. Since the sensor voltage signal is input directly from the multimeter’s table pen, analog amplification and A / D conversion are realized in the table With high accuracy and anti-jamming performance, in addition to the different ranges of the multimeter can be easily connected with various voltage, current and resistance sensors, and the test results can be sent directly to the computer.