It's easy for people to want to know something by looking at the object. When a machine is running, engineers have difficulty knowing its condition because they cannot see inside it. Engineers used to overhaul a machine to find defects such as scratches and burns left in the machine part, but this solution will definitely impact maintenance costs because overhauling a machine takes time, manpower and money. Maintenance costs are classified into internal costs such as labor, materials and tools and external costs such as outsourcing (Al-Najjar and Alysouf, 2001). An alternative method is introduced to reduce maintenance costs which is a vibration maintenance based method. Like doctors, they know the disease of patients from the symptoms, engineers also know the condition of a machine from its symptom, which is vibration. Therefore, vibration-based maintenance is an effective solution to know the condition of a machine. A vibration analyzer is a device that can show how much the machine vibrates and what the characteristics of the problem are, so that engineers can predict the condition of a machine. Comp...