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介绍了电机最低起动电压测试仪的硬件及软件设计，并对主要电路的结构及其特点进行了阐述。数据采集、频率测量和数据显示是本系统的三个重要组成部分。设计中本着精确、经济、安全和可靠的设计原则。“,”This paper not only introduces the hardware and softeware design of the lowest voltage measuring device, but also explains the main circuit structure and speciality. This system consists of three main parts, data collection, frequent measurement and data showing. The design basign bases on the principle of precision, economization, security and reliability.