基于ES51986的数字万用表设计

Design of Digital Multimeter Based on ES51986

该文介绍了某型综合测试仪中数字万用表模块的研究与实现方法。该模块以ASICES51986为核心，通过CPU（BF531 DSP）控制测量功能，处理测量数据并显示测量结果。较详细地介绍了ES51986的性能特点、控制方法和硬件电路设计思路；给出了前端衰减电路控制原理图，详细介绍了DSP对HC4094的控制和数字万用表前端衰减电路及软件设计流程图；最后分析了实际测量结果，提出了改良方法。测试结果表明，本数字万用表测量精度较高，操作简便、安全，测量功能可靠，能满足实际测量要求。

The paper developed the study and the implementation of digital muhimeter module in a comprehensive measurement device. With the ASIC ES51986 as its core, this model processes measuring data and displays measuring results by controlling the measuring functions of CPU （Blackfin531 DSP）. The paper introduces the performance characteristics, controlling methods of ES51986 and the hardware circuit designing, presents the schematics of front-end attenuation circuit controlling diagram. And also, it introduces in detail how HC4094 controlled by DSP and the front-end attenuation circuit of the digital multimeter and the software designing flowchart. Finally it analyses the actual measureing results and proposes the improved methods. The test result indicates that this digital multimeter is of high precision measurement, simple and safe operation, measuring reliability and can satisfy actual measureing requirements.