How often should equipment be calibrated? There is no universal interval.
Use measurement purpose, stability, usage, environment, history and requirements to establish and review a defensible calibration frequency.
Calibration frequency should be set according to measurement risk and evidence, including instrument stability, frequency and severity of use, environment, manufacturer information, previous results and applicable requirements.
Factors affecting frequency
Consider the consequence of measurement error, instrument design, required uncertainty, use rate, transport, handling, contamination, vibration, temperature and operator experience.
Customer, regulatory, contractual or standard requirements may impose additional constraints.
Set the initial interval
Manufacturer recommendations and experience with similar instruments provide a starting point. Choose conservatively where failure consequence is high or stability evidence is limited.
Document assumptions and ensure the interval matches the instrument's actual use rather than a convenient universal anniversary.
Adjust using evidence
Review as-found results, drift, adjustments, damage, repair, environmental changes and missed dates. Extend only when evidence supports continued confidence; shorten where instability or consequence demands it.
Statistical methods can help for larger populations, but competent technical review remains necessary.
Authoritative guidance
Use these primary sources alongside your organisation's competent technical and legal advice.
How often should equipment be calibrated? FAQs
Is annual calibration required for every instrument?
No. Annual calibration is common but not universally correct; frequency should reflect requirements, risk and evidence.
Can an interval be extended?
Yes, where permitted and supported by stability history, use and risk, with the decision documented and reviewed.
Does low use always justify a longer interval?
Not automatically. Storage, ageing, handling and the consequence of error may still matter.
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