Abstract：As a rule,a digital megohmmeter tests insulation on condition that cable is offline. 摘要：数字绝缘表通常只能对离线电缆进行绝缘测试。
Measure winding insulation resistance, use 500v Megohmmeter, insulation resistance value shall not less than 0.5 under normal temperature. 测量绕组的绝缘电阻;使用500V兆欧表;常温下绝缘电阻值不应低于0.;5;
It is not allowed to check the insulation performance of the generator by 220V AC voltage or a megohmmeter, otherwise the rectified diode may be penetrated and damaged by too high voltage. 不许用220V交流电压或兆欧表来检查发电机的绝缘性能，否则会因电压过高使整流二极管击穿损坏。
rated voltage below 100 V, use 500 V Megohmmeter. 额定电压为100V以下者，使用500V兆欧表。
Insulation Resistance meauring: rated voltage of 100 V and above, use of 1000 V Megohmmeter; 绝缘电阻的测定：额定电压为100V及以上者，使用1000V兆欧表；
Evaluation of Uncertainty in Result of a Measurement of Error of Indication of Resistance in the Measuring Apparatus of Megohmmeter 兆欧表检定装置示值误差测量结果的不确定度评定
