基于数字集成电路的数字式智能电压表的研制

Development of Intelligent Digital Voltmeter Based on Digital Integrated Circuit

为了解决一般数字电压表自动转换量程、被测电压极性判断、幅度变换、超量程显示及报警信号等智能化问题,采用数字电路芯片,通过数字逻辑控制关系实现电压表使用功能的智能化。阐明了电路设计原理,介绍了电路系统的组成、各部分电路的功能及特点、电路元件的选择、信号处理的过程等内容。通过实物验证,实现了设计功能,并由此设计得到了一台自制数字式智能电压表。

In order to solve the intelligentization difficulties existing in ordinary digital voltmeter,such as range automatic convertion,polarity judgment of measured voltage,amplitude transformation,overrange display and alarm signal intelligentization,the digital circuit chip is adioted to realize the intelligentization of voltmeter functions according to digital logic control relation.The design principle of the circuit is elaborated.The circuit system composition,function and characteristics of each part in the circuit,selection of circuit components,and signal processing process are introduced.The design functions are verified by an actual product.A homemade intelligent digital voltmeter with the design functions has been put into practice.