Amperometers can be divided into single-phase digital ammeters and three-phase digital ammeters. The ammeter has the functions of transmission, LED (or LCD) display and digital interface. Through AC sampling of various parameters in the power grid, the measurement results are displayed in digital form. After data processing by CPU, three-phase (or single-phase) current, voltage, power, power factor, frequency and other electrical parameters are directly displayed by LED (or liquid crystal), and corresponding analog electric quantities of 0-5v, 0-20 mA or 4-20 mA are output at the same time, which are connected with the remote control device RTU. With RS-232 or 485 interface.

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The measuring mechanism of ammeter and voltmeter is basically the same, but the connection in the measuring circuit is different.