407860-EU-EN v2.7 3/14
10
Appendix B: Relative Sensitivity Table (ISO 2954)
Frequency (Hz)
Relative sensitivity
Normal value Minimum value Maximum value
10 1.0 0.8 1.1
20
1.0
0.9 1.1
40
1.0
0.9 1.1
80
1.0
1.0 1.0
160
1.0
0.9 1.1
500
1.0
0.9 1.1
1000
1.0
0.8 1.1
Appendix C: Glossary
Vibration: Vibration is an oscillation or repetitive motion of an object around an equilibrium position.
Displacement: Displacement is the peak-to-peak distance from a reference position, or equilibrium
point, of an object under test.
Peak to Peak Amplitude: Peak –to-peak amplitude is the displacement of an object (see above). It
can be thought of as the distance from the maximum positive deviation point to the maximum
negative deviation point with respect to an object’s equilibrium position.
Velocity: Velocity is the rate of change of displacement. Velocity is measured in inches/second
(mm/second) units.
Acceleration: Acceleration is the rate of change of velocity. Units of measure for Acceleration is
feet per second
squared (meters per second squared)
Peak Amplitude: Maximum deviation of an object from its equilibrium position.
RMS: Root Mean Square Amplitude (RMS) is the square root of the average of the squared values
of a waveform. The RMS amplitude of vibration is 0.707 times the peak amplitude value The RMS
value of a vibration signal is an important measure of its amplitude.
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