基于DSP的高精度自动电阻测量仪设计

Design of High Precision Automatic Resistance Measuring Instrument Based on DSP

摘要:

以TMS320F2812处理器为核心,采用恒流与恒压相结合的方法针对100 Ω、1 KΩ、10 KΩ和10 MΩ共4种量程内的电阻进行测量,并详细介绍系统硬件电路、软件设计以及ADC采样校正算法研究；经过实验证明,该系统各量程内的电阻测量精度均达到0.3%,具有量程手动或自动转换档位、电阻自动筛选、语音提示、LCD显示等功能；该测量仪功能齐全、测量精度高、性能稳定,具有一定的实用价值。

Abstract:

Based on TMS320F2812 processor as the core, this paper adopts the method combining of constant current and constant voltage of 100Ω, 1KΩ, 10KΩ and 10MΩ four within the range of resistance measurement, and introduced the system hardware circuit, software design and the ADC sampling correction algorithms.The experiment proved that this system within the range of resistance measurement precision reached 0.3%, with a range of manual or automatic switch gear, resistance screening, voice prompt, LCD display, etc. The measuring instrument complete functions, high measuring accuracy, stable performance, has certain practical value. 