Equipment management
How often should measuring instruments be calibrated?
A suitable calibration interval is not one number for every instrument. It should reflect quality risk, frequency of use, environment and the instrument's observed drift.
Factors that determine the interval
Start with the consequence of an incorrect result, then consider use, transport, vibration, temperature, humidity and manufacturer information.
- Impact on product quality or safety
- Historical results and drift rate
- Customer, regulatory and quality-system requirements
- Intermediate checks and fault-detection capability
Adjusting the interval with evidence
Choose an initial interval and review consecutive as-found results. Stable, low-risk equipment may support an extension, while heavy use or movement toward limits supports a shorter interval.
- Retain as-found results
- Trend errors over time
- Record approval and reasons for interval changes
FAQ
Does every instrument have to be calibrated annually?
Not necessarily. Requirements depend on the instrument and applicable obligations. One year is often a starting point, not a universal technical rule.
Should new equipment be calibrated before use?
Review manufacturer evidence and intended use. Calibration or verification before use can establish a reliable baseline for the organization's measurement system.