Full definition
Instrument for measuring and verifying correct belt tension to ensure optimal drive performance and longevity. Two primary types: (1) Sonic/frequency meter — measures belt natural frequency (Hz) when plucked, then calculates tension from frequency, span length, and belt mass per unit length; accuracy ±5%; examples: Gates Sonic Tension Meter 508C, Optibelt TT3. (2) Force-deflection gauge — measures force required to deflect the belt a specified distance (typically 1/64" per inch of span); examples: Gates Krikit, Browning. Frequency-based meters are more repeatable and less operator-dependent. Correct tension is specified per belt profile and drive geometry in manufacturer catalogs. Under-tension causes slip and heat; over-tension causes premature bearing and belt failure. Check tension on new belts after 24-48 hours of run-in.