Metrological Traceability

What this topic covers

The unbroken chain of calibrations connecting a result to a specified reference.

Core testing ideas

Traceability belongs to a measurement result, not simply to a sticker on an instrument.

Each link in the chain contributes uncertainty.

Records must identify the references and calibrations that establish the chain.

Measurement and method limits

Traceability requires documented measurement relationships, not simply a calibration sticker.

Evidence and traceability

Laboratory competence includes people, methods, equipment, environment, records and impartiality.

Using the result

Quality-control checks should detect drift or abnormal method performance before questionable results accumulate.