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Appendix
1.0 Theory of operation
There is a direct relationship between belt tension and a belt’s natural fre-
quency 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 CLAVIS Belt Frequency Meter is a dual function tool. The optical sensing
head uses an invisible infrared beam to detect vibration. The acoustic sensing
head uses the almost inaudible acoustic signal from the belt to detect
vibration. The integral calculator within the meter 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.
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