Product description Three Phase Energy Meter Field Calibrator is a precision AC energy meter testing instrument, mainly used to test three phase energy meter error on site and measure various of AC parameters. Technical index Electrical parameters Accuracy class 0.05, 0.1 Resolution 6 TFT 640 480 Electrical parameters - continued Power supply 220V 10%, 50 60Hz Li-polymer battery size mm 110 51 16, nominal output voltage 7.2V, capacity 5000mAh Power line supply U1, UN, 85V-265V 50 60Hz Communication port RS232 Test voltage Range 5-480V Error 0.05% 30V-480V 0.1% 5V-30V Harmonic 2nd-63st