Dynamometer Calibration

Definition

Dynamometer calibration is a multi-step technical process: (1) physical inspection for damage, wear, or contamination; (2) testing at multiple points across the capacity range against NIST-traceable reference standards; (3) documentation of as-found readings before adjustment; (4) adjustment to bring out-of-tolerance readings within specification; (5) documentation of as-left readings after adjustment; (6) issuance of a calibration certificate with reference standard identification, technician identity, and calibration date. For mechanical AP dynamometers, calibration adjustments may involve spring tension adjustment or pointer repositioning. For electronic units, electronic zero and span adjustments are made.

Frequently Asked Questions

Why Dynamometer Calibration Matters

A dynamometer that has drifted out of tolerance produces measurements that are systematically wrong. In utility line tensioning, this means lines are strung to the wrong specification. In load testing, it means proof load requirements may not have actually been met. Calibration is what ensures the instrument is telling the truth.

How Dynamic Measurement Uses It

Calibration services generate approximately $550,000 annually for Dynamic Measurement Systems. Their service is ship-in only, with a standard turnaround and expedited 24–48 hour option. Standard fee for a 5-inch AP dynamometer calibration is $295.