介绍一种高精度程控电压源的工作原理和操作方法。本机配用双地址只听ＩＥＥ－４８８接口，可用微机控制，也便于面板操作。电源共分四档，其电压变化范围为５０μＶ～１００Ｖ，精度为±０．０５％，最大输出电流为２００ｍＡ，输出阻抗小于１ｍΩ。 Describes a working principle and operating method of a high-precision programmable voltage source. This machine is equipped with dual address only listen to IEE-488 interface, available computer control, but also easy to operate panel. The power is divided into four parts, the voltage range of 50μV ~ 100V, accuracy of ± 0.05%, the maximum output current of 200mA, the output impedance of less than 1mΩ.