高阻指针式检流计的设计

Design of the High-resistance Pointer Type Galvanometer

在分析传统检流计的基础上,采用恒流源式场效应管差分放大电路作为前级放大路以放大信号,2级运算放大电路作为后级放大电路,多电阻分两级调零,表头串接一电阻并在2端加装1个双向稳压管组成保护电路,传统检流计表头接保护电路完成指示功能,6节5号电池为电路供电,对传统的检流计进行了改进.结果表明,该设计提高了系统的测量精度和灵敏度,而且结构简单、稳定.

In our report, the traditional galvanometer was modified by increasing two and other circuits, the differential amplifying circuit was used as preamp to amplify cascade amplifying circuits signals , at the same time, input resistance was increased, the measured circuit was protected, and the measuring precision was improved. Two cascade op-amp circuits were used as the latter grade amplifier circuit to stabilize the circuit and raise the system sensibility. Two cascade ZA circuits were used to complete the function of ZA. The protecting circuit was made of gauge outfit, resistance and dual stability, the pointer adding the protecting circuit completes the display function, moreover, we used input batteries as power source. The results indicated that circuit is simple and vis- ual display.