Calibration Chain
Measurement security and global consistency require a structured sequence of calibrations that links working instruments back to international standards. This organization, known as a traceable calibration hierarchy, consists of an unbroken chain of comparisons, each with a stated measurement uncertainty. Working standards used on the factory floor are calibrated against secondary laboratory standards, which in turn are calibrated against primary national standards.
Each tier in this structure must be documented to prove compliance with international measurement guidelines.
Uncertainty Accumulation
Uncertainty increases at each level as calibrations move down the chain from primary to working standards. The primary standard has the lowest uncertainty, while the industrial sensor has the highest. This accumulation of error must be carefully calculated and kept within acceptable limits.
Quality Standard
Laboratories participating in this structure must be accredited to international standards such as ISO/IEC 17025. This accreditation ensures that their processes, equipment, and technicians are capable of performing the required measurements.
Hierarchy Verification
Regular audits and proficiency testing verify that the chain of traceability remains intact and accurate. Auditors review calibration records, instrument certificates, and uncertainty budgets to confirm that the measurements are linked to the correct national references. This continuous oversight maintains confidence in industrial measurement data.
