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Calibration · Glossary

What is Traceability?

unbroken chain to SI unitsCalibration

Traceability links a measurement result to national standards through an unbroken chain of calibrations, each with stated uncertainty.

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Traceability Explained

Your working standard is calibrated against a reference standard, which is calibrated by an accredited lab against national standards, which realise SI units.

Each link must have a valid certificate with uncertainty; one missing link breaks traceability.

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Calculators for Traceability

CalculatorTest Uncertainty Ratio CalculatorFree online calculator with formula and worked example.CalculatorCalibration Interval CalculatorFree online calculator with formula and worked example.

Free Downloads

Free downloadCalibration Certificate Format in ExcelFree download in Excel and PDF.Free downloadCalibration Master List Format in Excel with Due Date TrackerFree download in Excel and PDF.

Frequently Asked Questions

What is Traceability?

Traceability links a measurement result to national standards through an unbroken chain of calibrations, each with stated uncertainty.

Is a maker certificate enough?

Only if it shows traceability with uncertainty; accredited certificates are the clearest proof.

How do auditors check traceability?

By following certificates from the instrument up to the accredited lab.

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Related Terms

Calibration termReference StandardA reference standard is the highest accuracy standard at a site, used to calibrate working standards…Calibration termCalibration CertificateA calibration certificate is a formal document reporting calibration results, the reference used,…Calibration termISO/IEC 17025ISO/IEC 17025 is the international standard for the competence of testing and calibration laboratories.

More Calibration Terms

Calibration termDeadweight TesterA deadweight tester generates a precise pressure by placing known masses on a piston of known area.Calibration termLocal GravityLocal gravity is the acceleration due to gravity at a site; it varies with latitude and height and…Calibration termAs Found and As LeftAs found and as left are the calibration readings taken before any adjustment (as found) and after…Calibration termFive Point CalibrationA five point calibration checks an instrument at 0, 25, 50, 75 and 100 % of range, usually rising and falling.Calibration termCalibration IntervalA calibration interval is the time between scheduled calibrations, set so the instrument is likely to…Calibration termDriftDrift is a slow change in an instrument reading over time when the input stays the same.

All calibration terms · Full glossary A to Z

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