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The programmable standard resistance generator controlled by Single-chip Microcomputer

CHEN Hui(Colle.of Elec.& Info.Engn,Nanjing University of Information Science and Technology,Nanjing 210044,China)  
The programmable resistance network is digitized and programmable,and the resistances can be combined discretionarily.It is a kind of practical scheme for programmable resistance being widely used to test automobile instruments.The circuit of programmable standard resistance generator is designed to generate a programmable standard resistance.The hardware circuit of the system mainly uses single-chip microcomputer,the output of the resistance takes 8421 coding mode,the settings are keyed by matrix keyboard,and the magnitude of the settings is displayed by LCD.The paper elaborates the circuit components,the operating principle and the software programming of the system.
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