The design principle and constitution of remote concentrated ammeter reading system is presented,the design of its communication software is described.

This paper intr oduces the structures and working principles of domestic and overseas ammeters used in centralized reading the meter.

This paper introduces the appropriate design of circuit diagram and studies the methods in demarcating ammeter specification and calibrating ammeter by means of potentiometer.

The Development of The multiuser electric meter with prepay in IC card;

This article puts forward the design of an experimental circuit based on the high precision of the potential difference for calibrating electric meter Series C13 as a reasonable solution for increased accuracy.

Data safety technology in a multichannel KWH meter;

Design of the Reading Instrument of Electric Kilowaterhour Meter Based on VHDL;