Manual
12
5.4 Measuring in accordance with SN 640312a
Measurement procedure
The Swiss Standard SN 640312a is also based on the peak values of the vibration velocity. However, it
uses the vector sum as assessment parameter:
It measures between 5 and 150 Hz. The frequency range is divided into three sections: 8 to 30 Hz, 30 to
60 Hz and >60 Hz. For frequencies below 8 Hz, the reference value for 8 to 30 Hz reduced by one third is
applied.
As a basis for the reference values, four building types with different levels of sensitivity and the
frequency at which the vibration influence occurs are taken as a the basis for the reference values.
Measurements with the PCE-VM 40
After selecting the measuring mode “SN 640312a”, define which sensitivity class the building belongs to:
Once you have selected the building type, select the occurrence of the vibrations. The figures represent
the vibration emissions at which the velocity vector exceeds the reference value 0.7 times. The
assessment period is the time duration during which the building is exposed to vibration.
Press F3 to exit the menu and to go to the measurement value display
Summary of Contents for PCE-VM 40A
Page 31: ...Manual 31...
Page 32: ...Manual 32...
