Design Of Multimeter For Electrical Parameters

The multimeter for electrical parameters is based on Single Chip Microcomputer (Intel 803 1).We adopt alternating sampling and numerical computation technology. Software replaces much hardware that in traditional instrument . We can measure the effective valuesof voltage and current,power,frequency by the instrument .The instrument can easily communicate with PC for the use of Microcomputer.Inorder to realize remote measuring and control , we adopt RS-232 interface and its correspondent protocol that is widely used.In this paper,the operation theory is ntroduced.We research the Quasi.synchronous Alternative sampling echnology in detail to improve the precision of the instrument and discuss some problem about the plication of this method .We introduce the develop of hardware and software in the whole instrument .At last ,we sive out the result of experiment and the analyses of error.