Background Noise; Sonic Tension Meter Operating Theory - Gates 508C Handbuch

will be displayed. Choose a range with
the "UP" or "DOWN" button, and determine
with "MEASURE".
Note: the letter in the upper left hand corner
of the LCD display indicates the frequency
range setting pointer (5) on page 4: H - High,
S - Standard.

Background noise

The microphone gain level is set automatically
when the unit is turned on, based upon
environmental background noise.
Note: if maximum microphone sensitivity is desired,
turn the meter on without the microphone attached
and wait for the meter to power up. Then connect
the microphone so tension measurements can
be taken.
Battery Gauge
A battery graphic is located in the upper-right
hand corner of the LCD screen. This gauge
provides an estimate of the remaining
battery power.
A dark filled graphic indicates a full charge.
When the battery level becomes critically low,
the meter indicator as well as a "Low Batt"
message both blink.
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
0
Oscillation damping in a synchronous belt
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.
3MGT - PowerGrip
9 mm width belt
Time (millisecond)
GT3
®
80
UK
F
I
E
NL
D
PL
R
TJ
7