... to ground.Insulation resistancePut 500Vdcvoltage on input and output terminal for 1 minute, test resistance>7MΩOver loadEnter into hiccup mode ... ,Z, frequency 10-55HzSafetyStandardUL60950,EN60950-1,EN61000,ANSI C63.4EMCStandardEN55022 Class B,EN55024,EN61000-3-2,EN61000-3-3OtherMTBFContinually work 8 ... .1uf & 47uf parallel capacitor. Active POE injectors(56V0.6A) used for high definition IP camera