：本设计采用集成芯片ICL7107作为数字电压表的A／D转换及锁存和译码模块，使得电路具有设计

简单、集成度及可靠性高的特点。该系统设计了自动切换量程功能，能够实现0～199mV、0-1．99V、0～19．99V、

0～199．9V、0～1999V，共5个量程电压值的测量。本系统做成了电路板，进行了测试，得到了良好的测试结果。-: This design uses a chip as a digital voltage meter ICL7107 the A/D conversion and latches and decoding module, making the circuit has a simple design, integration and high reliability characteristics. The system is designed to automatically switch range features, be able to achieve 0 ~ 199mV ,0-1 .99 V, 0 ~ 19.99V, 0 ~ 199.9V, 0 ~ 1999V, a total of five voltage range measurements. Resulted in the system circuit board, conducted a test, get a good test results.