The effective value of the vibration velocity is used for assessing the machine condition. This value can be determined by almost all conventional vibration measurement devices.

DIN ISO 10816-3 separates the machines into different groups and takes the type of installation into account.

• Green: Zone A
  Vibration values from machines just put into operation.
• Yellow: Zone B
  Machines can run in continuous operation without any restrictions
• Orange: Zone C
  Vibration values in yellow indicate that the machine condition is not suitable for continuous operation, only for a limited period of time. Corrective measures should be taken at the next opportunity.
• Red: Zone D
  Dangerous vibration values – damage could occur to the machine.