Scales and mass
How to calibrate scales and standard weights for their intended use
Useful scale calibration reflects capacity, resolution, routine loads, critical operating points and environment. A single weight reading rarely represents the full measurement risk.
Information needed to choose calibration points
Document maximum capacity, resolution, actual operating range, common product loads and process tolerance so test points represent the intended use.
- Check zero and repeatability
- Distribute loads across the operating range
- Consider eccentric loading where position matters
- Record units and the installed location
Reference weights and reported results
Reference weights should be traceable and suitable for the scale resolution. Results should identify indication, reference value, error and uncertainty at each point.
- Confirm weight identification and certificates
- Control handling, cleanliness and temperature
- Agree a decision rule when a conformity statement is required
FAQ
How many points should be used for scale calibration?
The number depends on the operating range, risk and process requirements. Multiple points should cover low, middle and high loads plus critical routine loads.
Must a scale and its check weights be calibrated separately?
Yes. They are separate items with their own calibration results. Weights used to check a scale should have appropriate metrological traceability.