Normally, vibration is very sensitive to bearing damage. Any peeling, indentation, corrosion, cracks, wear, etc. will be reflected in the bearing vibration measurement. Therefore, a bearing vibration measuring should be done by using a special instrument (frequency analyzer, etc.), the magnitude of the vibration can be measured, and the specific abnormal situation can be inferred through the spectrum score. Due to the different bearing conditions or the mounting position of the sensor, the measured values are also different. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.