The digital display power meter is used to measure and display the electrical parameters of current, voltage, frequency, active power, reactive power, and power factor in the power grid and automation system.

​Digital display power meters can complete power measurement, power metering, data display, collection and transmission, and can be widely used in substation automation, vivid power distribution, intelligent buildings, and internal power measurement, management, and assessment of enterprises.

​Multi-function power meter is a kind of multi-function smart meter with programmable measurement, display, digital communication and electric energy pulse transmission output during independent research and development.

​Both ammeter and voltmeter are important electrical instruments. They both have similarities and differences in structure and use.

In order to prevent the interference of the electric field, the signal wire can be inserted into the iron pipe, or the shielded wire can be used, and the shielding layer should be grounded.

The wires and internal wiring between the signal source and the instrument cause interference in the circuit through magnetic coupling.