Environment and Site Survey Measurement
46 H157655_1_008
7.1.3 Measuring Floor Vibrations
Bruker offers a service for measuring floor vibrations using specialized hardware and
software. 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.
Furthermore, we recommend a measurement resolution of <= to 0.125 Hz, enabling the
collection of correct amplitudes in the low frequency range.
Also we recommend simultaneous measurements (multiple transducers) along the 3 axis
(vertical, 2 horizontal).
7.1.4 Bruker NMR Floor Vibration Guidelines
EMI damping system (Elastomeric Isolators)
Figure7.2: Threshold Values of Floor Acceleration: Tolerance Level for EMI Dampers
Frequency Maximum Velocity in
Vertical Direction
Maximum Velocity in
Horizontal 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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