A calibration schedule should show what is required—not only what is due.
Structure instrument requirements, interval basis, approved methods and responsibility so calibration work can be prepared and evaluated consistently.
A calibration schedule is the controlled plan defining which instruments require calibration, by what method and interval, under whose responsibility and with which status and supporting standards.
Essential schedule fields
Include instrument identifier, description, location, range, unit, required tolerance or accuracy, method, interval, last and next dates, owner and status.
Add reference-standard or laboratory requirements where these need advance coordination.
Plan internal and external routes
Internal work needs an appropriate method, competent person, environment and in-calibration standard. External work needs an approved supplier, suitable accredited scope where required, transport and temporary replacement planning.
Schedule enough lead time for quotation, shipment, turnaround and review.
Handle overdue and changed instruments
Define what overdue means and whether the instrument can remain in use. Damage, relocation, repair or suspected error may trigger calibration outside the normal schedule.
Preserve changes to interval and due date with their reason rather than rewriting history.
Authoritative guidance
Use these primary sources alongside your organisation's competent technical and legal advice.
Calibration schedule explained FAQs
What belongs on a calibration schedule?
Instrument identity, requirement, method, interval, due date, owner, status and relevant standard or supplier information.
Can a schedule include reference standards?
Yes. Reference standards need their own status and due-date control so they are suitable when used.
Should an overdue instrument be used?
That requires an authorised, risk-based decision under the organisation's procedure; overdue status should be clear and controlled.
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