When we approach directly to the machine for the data collection and measurements, it would be great to analyze many other things apart from vibration measurements like acoustic, thermal issues and any base related findings.
Both online & offline condition monitoring have their individual Pros and cons. Suppose a machine suffers with High vibration and no sensor installed on it. In this case, offline or onsite condition monitoring needed.

Unbalance is one of the most common causes of machinery vibration. The main purpose of dynamic balancing is to balance the rotor that is running with out-of-balance.
We can fix it in either single plane or double plane field balancing. In situ dynamic balancing can dramatically reduce vibration levels without disturbing the machine. Also ensures that the expected machine life is achieved.
Factors that cause Unbalance are:

Misalignment is another most common cause of machinery vibration.