SKF PHL FM 10/400, User Manual

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Appendix
1.0 Theory of operation
There is a direct relationship between belt tension and a belt’s natural frequency of vibration.
As the tension is increased, the vibration frequency also increases. The relationship between
tension and frequency has been determined to be:
T = 4ml
2
f
2
Where
T = Belt tension (N)
m= mass per unit length (kg/m)
l = span length (m)
f = vibration frequency (Hz)
The SKF Belt Frequency Meter is a dual function tool. The optical sensing head uses an invisible
infrared beam to detect vibration while the integral calculator determines the time base and
performs the necessary calculations to support the results shown in the display window.
The meter may be used with all power transmission belts regardless of type or construction.