Insulation resistance measurementTest voltage (dc)Range (dc)Accuracy (? reading)250 V 200 kΩ to 5 GΩ 5 GΩ to 50 GΩ > 50 GΩunspecified 5 % 20 % unspecified500 V 200 kΩ to 10 GΩ 10 GΩ to 100 GΩ > 100 GΩunspecified 5 % 20 % unspecified1000 V 200 kΩ to ...