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3.3.3
Calibration
The VIBRA and the VIBRA geophone should preferably be calibrated once a year. The Profound M&S
agreement covers a yearly calibration of the system and its geophone.
Vibration monitoring with the VIBRA
4.0
Preparation of the VIBRA
4.1
Only a few checks have to be made before the VIBRA is ready to be used. Please take into account that
the positioning of the system and the measurement settings need to be based on the site conditions
(location, lay-out, vibration source, soil investigation results, buildings, damage and nuisance criteria).
1. Proper connection. The geophone should be connected to the VIBRA, as described in the
paragraphs 4.1.1 - 4.1.3. The USB socket should be closed with the cover in order to guarantee
the IP65 protection.
2. Battery/memory. The batteries of the VIBRA should preferably be full and the internal memory
should be empty. If necessary, erase the data via the Main Menu option Erase Data and/or
replace the batteries.
3. Settings. The settings, especially date and time, of the VIBRA should be correct. Check and if
necessary, adjust the settings in the Main Menu option Date and Time. Other settings can be
adjusted in the submenu Change Settings, as described in paragraph 5.3.
You can consider placing two systems and thus excluding local effects, as for example slamming a
door nearby or somebody hitting the geophone.
4.1.1
Positioning the geophone
You need to install the geophone properly in order to ensure accurate measurements of the vibrations in
the structure.
The proper mounting techniques to install the geophone are:
•
Glue
Glue is the best way to mount the geophone bracket to the wall. Special 2-
component glues are available, which can be used to glue the geophone
bracket on almost any surface, as shown below. For optimum installation
the geophone bracket can also be screwed into the wall for extra security
during curing time.
Manual Profound VIBRA-series, version 2.00
11
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