Manual Profound VIBRA-series, version 2.00
13
• Tripod. On a hard, fairly smooth surface the tripod can be used to place the geophone. In
general, the registered vibration level is not affected by placing the tripod on the surface,
provided the accelerations are not too high. The DIN 4150 defines this as 3 m/s
2
at any
frequency below 100 Hz. The DIN 45669-2 gives more limitations.
• Geophone mounting plate. If you need to place the geophone on a floor with or without a
soft top layer, the Profound stainless steel mounting plate can be used in two positions: with
the pointed side down (when used on a soft layer) or with the round side down (when there
is no soft layer). Thus, the mounting plate fully complies with SBR – part A 2002 and DIN
45669-2 June 2005.
Placing the mounting plate
1. Choose the side of the spikes, dependent on the surface on which the plate has to be
placed, as shown above.
2. Fully screw the three spikes into the mounting plate with the spanner, which is
delivered with the VIBRA. The spikes may never be used to horizontally position the
mounting plate.
3. Use the spanner to fasten the geophone with the ball joint on the mounting plate.
4. Place the mounting plate with the geophone on the desired location and, if necessary,
further adjust the horizontal position of the geophone with the Profound ball joint and the
spanner.
Due to the compact size of the VIBRA and its versatile mounting facilities for the geophone, installation of
the system normally does not take more than a few minutes.
4.1.2 Positioning the VIBRA
In the field, the VIBRA can be put down on the floor or ground surface or
attached to a wall.
At the right side of the VIBRA a Kensington® anti-theft lock has been fitted. The
system can be easily locked with the Kensington
® security cable that can be
obtained at most computer shops.
geophone mounting plate
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