VMI VIBER X3, Manual, Page: 17 / 60

Vibraon Measurement Instruments
15
8 How to interpret vibration levels
A user with no previous experience, should use the ISO 10816-3 standard.
The standard normally calls for a velocity measurement in mm/s RMS.
To
better understand what this measurement means, think of it as how fast the
machine is moving back and forth. This measure gives a good understanding
of the amount of “break down energy”, causing mainly wear and fatigue in
the machine or the structure.
The instrument measures the total RMS vibration value in the frequency
range. This RMS value is the average sum of all the measured vibrations.
Example:
If the simultaneous vibration caused by unbalance is (4mm/s), by misalign -
ment (2 mm/s) and by the gear mesh (5 mm/s) then the total vibration mea -
sured with VIBER X3™ is 6.7 mm/s.
Notice that a reduction of the unbalance from 4 mm/s to 1 mm/s
will reduce the total value from 6, 7 mm/s to 5, 5 mm/s.
Total vibration(RMS)=
√
4*4+2*2+5*5=
6,7mm/s