以往的电机测试往往采用普通的指针式仪表由人工读数、人工记录，然后由人工整理成数据并描绘曲线或编写实验报告。由于某些原因如电源的波动、频率波动、负载波动等因素会使仪表的指针摆动，为了能比较准确的读出某一瞬间的各项被测参数，往往需要几个人同时读表，工作效率低。不仅如此，由于读表的不同时性以及读数、记录、计算中各种人为误差还会使实验数据分散性大，试验经过的准确度低，重复性差，现在这种测试方法基本被淘汰。
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