Background Noise; Sonic Tension Meter Operating Theory - Gates 507C Manuel D'utilisation

will be displayed. Choose a range with the UP
or DOWN button, and determine with
"MEASURE".

Background noise

It is not necessary to set "Gain" with this meter.
Gain is set automatically when the "Power" key
is pushed. Turning on the meter without the
sensor attached will result in the meter having
UK
maximum sensitivity.
4. Sonic tension meter
operating theory
When an impulse is applied to a belt span, it first
oscillates in all modes of vibration, but the higher
frequency modes decay faster than the
fundamental mode. This leaves a continuous
sinusoidal wave that is related to a specific belt
tension. See diagram below.
2
0
-2
Using a microcomputer, a data processing
method to capture a belt's natural oscillation
frequency was developed. Using this method,
the wave form frequency can be determined
easily.
The new system uses special sensors to detect
belt oscillation wave forms. Data from these
sensors is sent to the microcomputer inside the
sonic tension meter for processing and
conversion into the natural frequency. To
calculate belt tension, the sonic tension meter
system uses the "transverse vibration of strings
theory". To operate the meter, the unit weight,
span length and width of the belt must be entered.
Formula: T = 4 x S
Where: T = belt span tension (newtons)
Unlike a string, belts have cross-sectional rigidity.
Therefore, tension values measured by the meter
may be higher than the actual belt tension,
depending on the operating conditions under
which the effects of rigidity arise. When the actual
belt tension must be more precisely measured, a
simple calibration test may be necessary. This
calibration procedure is discussed in the section
on "Meter recalibration for non-standard belts".
6
3MGT - PowerGrip
0
Time (millisecond)
Oscillation damping in a synchronous belt
2
S = length of the span to be
measured (mm)
M = belt unit weight (g/m/mm)
f = natural frequency of the belt (Hz)
W = belt width (mm)
9 mm width belt
2
x M x W x f
GT3
®
-9
x 10
80