This part of ISO 10816 gives criteria for assessing vibration levels when measurements are made in situ. The criteria specified apply to machine sets having a power above 15 kW and operating speeds between 120 r/min and 15 000 r/min. The machine sets covered by this part of ISO 10816 include: - steam turbines with power up to 50 MW; - steam turbine sets with power greater than 50 MW and speeds below 1 500 r/min or above 3 600 r/min (not included in ISO 10816-2); - rotary compressors; - industrial gas turbines with power up to 3 MW; -generators; - electrical motors of any type; - blowers or fans.