Environment and Site Survey Measurement
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7.1.3 Measuring Floor Vibrations
Bruker offers a service for measuring floor vibrations using specialized hardware and soft-
ware. We recommend measurements to be done over a period of at least 1 hour (ideally
much longer) to try capturing both steady state conditions and transient events.
For an accurate assessment of the floor vibration threshold, an FFT with at least 1601 lines
on 200 Hz bandwidth should be used. The Power Spectrum Display (PSD) representation is
depreciated for its limited accuracy in amplitudes.
Also we recommend simultaneous measurements (multiple transducers) along the 3 axis
(vertical, 2 horizontal).
7.1.4 Floor Vibration Guidelines: Bruker EMI Damping System
EMI damping system (Elastomeric Isolators)
Figure7.2: Threshold Values of Floor Acceleration: Tolerance Level for EMI Dampers
Frequency Maximum Velocity in Verti-
cal Direction
Maximum Velocity in Hori-
zontal Direction
1-10 Hz 1.6…0.64 µm/s 1.6…0.64 µm/s
10-20 Hz 0.64…6.4 µm/s 0.64…6.4 µms
>20 Hz 6.4 µm/s 6.4 µm/s
Table7.2: EMI Damping System (Elastomeric Isolators)
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