... to computer. Description: The test set used for CT site calibration at power frequency state. The tested CT accuracy can reach ... ,315,400, ² 500,600,630,750,800,1000,1200,1250,1500,160,2000,2500,3000,3150,4000,5000A ² Secondary:5,1A ... ~ 40°C -Humidity: <80%(25°C) -Altitude :< 2500m High Accuracy Calibration of current transformer Tester