1. Input characteristics Voltage measuring range: 0~200V~800V, automatic cutting gear. Current measurement range Clamp transformers (three types): 5A / 25A (standard)100A / 500A (optional)400A / 2000A (optional) Phase angle measuring range: 0 ~ 359.99 °. Frequency measurement range: 45 ~ 55Hz. Voltage channels: three-channel (UA,UB,UC). Current channels: three-channel (IA,IB,IC). Maximum harmonic analysis times: 63 times. Maximum continuous storage period in 1 minute interval: 18 months. 2. Accuracy Measurement of electrical parameters section: Voltage: ± 0.2% Frequency: ± 0.01Hz Current, power: ± 0.5% Phase: ± 0.2 ° Power quality section: Fundamental voltage tolerance: ≤0.5% F.S. Fundamental current tolerance: ≤1% F.S. Phase between fundamental voltage and current measurement error: ≤0.2 ° Percentage of harmonic voltage measurement error: ≤0.1% Percentage of harmonic current measurement error: ≤0.2% Three phase voltage unbalance error: ≤0.2% Voltage deviation error: ≤0.2% Voltage fluctuation error: ≤0.2% 3. Working temperature: -10 ℃ ~ + 40 ℃ 4. Charging Power: 220V AC, 45Hz-55Hz frequency 5. Host Power: ≤3VA 6. Battery maximum working time: ≤10 hours 7. Insulation: 1) The insulation resistance between the voltage, current input terminal and the housing ≤100MΩ. 2) Withstand 1.5KV (valid value) with power frequency on operating power input and the shell, which lasts one minute. 8. Size: 258mm × 158mm × 58mm 9. Weight: 1.8Kg