该电路通过对被测电压的判断和量程选择器的控制，实现了在高精度仪表中量程的自动选择。
The circuit, through evaluating the input voltage and controlling the selector of the measuring scale, realizes automatic selection in high precision instrument.
软件部分主要包括系统的初始化、自检、量程选择、平衡参数设置、定标系数确定、动平衡测量、键盘中断处理、彩色液晶显示等模块。
Software consists of system initialization, self-test, measurement range selection, balance parameter setting, calibration coefficients determining, access programs of keyboard and LCD.
选择伏特计的最低量程。
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