说明：  　以 AT89S52为核心 ,通过 A/D、D/A转换和 V/ I转换及独特的算法实现高精度的电流控制 ,电流输出范围为 20～ 2000mA的数控直流电流源。该电流源具有电流可预置 , lmA步进 ,同时显示给定值和实测值等功能。
(to AT89S52 as the core and, through A/D, D/A conversion and V/I and unique conversion algorithm, high-precision current control, Current output range of 20 ~ 2000mA NC DC current source. The current source can be preset with current, lmA stepper, also showed a given value and the function of the measured value.)