基于单片机的自动电阻测量仪设计

自动电阻测量仪设计采用C8051F020单片机作为核心,采用高精度恒流源驱动的伏安法针对不同档位电阻进行测量,选用MAX1241高精度A/D转换器进行模数转换,具有100Ω1、kΩ、10 kΩ1、0 MΩ四个量程,电阻测量精度均达到0.4%。各档位之间均可以实现手动分档或自动档位切换,并能根据键盘输入的电阻值和误差值进行筛选,对于不合格的电阻能够给出语音提示,该系统同时可以自动测量连续变化的电阻值并实时显示及绘制变化的曲线。自动电阻测量仪体积小、精度高、运行稳定可靠,具有一定的实用价值。

Design of Automatic Resistance Measuring Instrument Based on Single Chip Microcomputer

Design of automatic resistance measuring instrument is based on C8051F020 microcontroller as the core.It measures resistance according to different gears by using voltmeter-ammeter method driven by high-precision constant current source.And MAX1241 A/D converter,with 100Ω、1kΩ、10kΩ、10MΩ four range,is to realize analog-to-digital conversion,so the precision of resistance measurement is up to 0.4%.The gears can be manual or automatic shifted.And it can identify error value according to the resistance value input by keyboard and gives voice alarm for unqualified resistance.Besides,this system can automatically measure the continuous change of the value of the resistance and display the curve on the screen.Automatic resistance measuring instrument has the advantages of small volume,high precision,stable and reliable operation,so it has a certain practical value.