GF1021 portable single phase energy meter test system used to test single phase energy meter error. Adopt mature signal synthetic and power amplifier technology, high precision voltage source and current source output. Widely used in the laboratory and field, and then as single phase standard source. The portable meter test equipment offers high functionality combined with an excellent menu guided operation via coloured 7' touch screen or externally via interface. It can be programmable via RS232 port by PC management software.