16
Re-calibration for Non-Standard Belts
Measuring the tension of special belts with extra thick backings,
alternate materials, etc., may yield less than accurate results using belt
mass constants for standard belts. In these cases, a simple calibration
process may be used. The belting can be placed on a fixture with a
known span length under various known tensions (hanging weights can
be used). By taking frequency measurements at various tensions, span
frequency vs. tension data can be collected.
This data can then be used in a graphical format or in equation form to
convert measured span vibration frequencies to accurate belt tensions.
Data of this type is specific to each application and cannot be applied to
drives with different span lengths. Because the resulting data may not
be linear, it is best to measure the tension of non-standard belts in terms
of frequency rather than deriving new belt mass constants to measure in
terms of absolute tension.
Summary of Features
• Model 508C - Product No. 7420-0508
• Includes cord type sensor - Product No. 7420-0206.
• 40 Memory Registers for Belt Constants
• Max Frequency of 5000 Hz
• Auto Microphone Gain Control
• Variable Frequency Range Filters
• Auto Shut Off - The meter will automatically shut off after 5 minutes of
inactivity. Power can be shut off manually by pressing and holding the
power button for 1-2 seconds.
• Batteries - 2 each; AAA. The battery compartment can be found on the
backside of the meter.
Optional Accessories
• Flat Flexible Sensor -
Product No. 7420-0205
Makes single-handed operation possible.
• Inductive Sensor -
Product No. 7420-0212
Recommended for noisy or
windy environments.
Magnets included.
• Replacement Magnets (set of 10) -
Product No. 7420-1212
For use with inductive sensor.
SonicTensionMeter_Manual_4_14.indd 16 4/26/14 9:09 AM
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