INSULATION RESISTANCE - Test Voltage (DC V) 250V/500V/1000V - Output Voltage Open Circuit + 10% - Measuring Ranges (Auto) 0-20/0-200/0-2000M Ohm - Output Current 250V : 1mA DC min. at 0.25M Ohm, 500V : 1mA DC min. at 0.5M Ohm, 1000V : 1mA DC min. ...