Environment and Site Survey Measurement
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Frequency Maximum Velocity in Ver-
tical Direction
Maximum Velocity in Hor-
izontal Direction
1-5 Hz 3 µm/s 3 µm/s
5-20 Hz 3…12 µm/s 3…12 µms
>20 Hz 12 µm/s 12 µm/s
Table7.4: Tolerance Level for API Damping System
Figure7.8: Example of the Bruker Tolerance Level for API Dampers. Resolution <0.125 Hz, 1…200
Hz,> 30 min, Average Spectra Measurement 1 (displayed in velocity)
According to VDI 2038 (2013) Bruker is following the threshold values of sensitive laboratory
equipment. Bruker implemented a Nano-C limit which is less critical as Nano-D. The only big
difference in observing these data is to use a higher resolution as only 1/3 octave. We recom-
mend to measure with a resolution of < 0.125 Hz to get the right amplitudes in the low fre-
quency part (average spectra over a period of > 30 min).
Figure7.9: Schematic Drawing of an API Type Damping System
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