meter diagram
1.eg,it is far higher than the d eman ds of precision when PF =1and PE =0.5.Meanwhile,the dynamic s cope of wa tt-hour meter is more than 500.This article also intro-duces the structur e and principles o f the whole system,including single chip,IC card and AD77 55hardware design. It disensses specially the measures of hardware taken in re latio n to reliability,presenting a diagram of electric principles.
