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1. MEASUREMENT
TRACEABILITY
Principles and Practices

2. Measurement
Measurement is a process that is used to determine a value, Basically a Physical
Quantity.
It requires a Unit to determine the magnitude of a physical quantity which is
known as the Units of Measurement.
Universally adopted International System of Units (SI Units) was Introduced
which includes seven fundamental units. These are as follows-

3. SI Unit Physical Quantity
Meter (m) Length
Second (sec) Time
Kilograms (kg) Mass
Ampere (A) Electric Current
Kelvin (K) Temperature
Candela (Cd) Light
Mole (mol) Amount Of Substance

4. MEASUREMENT TRACEABILITY
Measurement traceability is a method of ensuring that a measurement is taking
into account all uncertainties and is an accurate representation of an object
being measured. The basis of this method is that a measurement should be
tested against a higher calibration reference standard, unit or procedure. It
requires an established calibration hierarchy.

5. Measurement Traceability Pyramid
SI UNITS
NATIONAL METEROLOGY
INSTITUTES e.g. CSIR-NPL
Primary Labs– e.g. FSSAI
Secondary Labs- e.g. SIGMA TEST AND RESEARCH
CENTRE
Industrial Measurements

7. Importance of Measurement Traceability
To assure that your measurement results agree with national or
international standards within the uncertainty limits.
To minimize the risk of falling victim to fraudulent information and
activities.
To ensure the health and safety of the society.

8. International Standard for Testing
and calibration Laboratories
Accreditation world wide to
demonstrate technical proficiency
Operates Quality Management System
to provide technical Competency

9. Traceability Requirements Of ISO 17025
◦ Traceability should be established via an unbroken chain of calibrations linking your
measurement standards to primary standards of the SI units of measure.
As Mentioned in 5.6.2.1.1 ‘For calibration laboratories, the programme for calibration of
equipment shall be designed and operated so as to ensure that calibrations and measurements
made by the laboratory are traceable to the International System of Units (SI).’
◦ Calibration services used should be competent, capable, and traceable.
“5.6.3.1 The laboratory shall have a programme and procedure for the calibration of its reference
standards.

10. 5.6.2.1. Such reference standards of measurement held by the laboratory shall be used for
calibration only and for no other purpose, unless it can be shown that their performance as
reference standards would not be invalidated. Reference standards shall be calibrated before and
after any adjustment.”
◦ If lab equipment is not affected by the uncertainty of the test result neither the measurement
traceability is required, one must have objective evidence to support their decision as stated
in ISO/IEC 17025 standard, the ILAC P10 policy-
If a calibration is not a dominant factor in the testing result, the laboratory shall have
quantitative evidence to demonstrate that the associated contribution of a calibration
contributes little (insignificantly) to the measurement result and the measurement uncertainty of
the test and therefore traceability does not need to be demonstrated.

11. ISO
Requirements
Traceable to
Primary
Standards
Competent
Capable and
Traceable
Calibration
Objective
Evidence on
Requirement

12. Obtaining Measurement Traceability
• Ensure that the services are covered by CIPM MRA
• These Services should be listed in Appendix C of BIPM Key
Comparison Database.
National Meteorology
Institute
• Ensure that the services are listed in scope of accreditation
• Verify that it is covered by the ILAC Mutual Recognition
Arrangement.
Accredited Calibration
Lab
• CRM should be included in BIPM Key Comparison Database
• RMs provided by NMI included in BIPM Joint Committee for
traceability in Laboratory Medicine Database.
Certified Reference
Material

13. Procedure
Review Your Calibration Report
Accreditation Body Symbol Measurement Result Measurement Uncertainty Description of the Reference Standard
Submit Your Equipment For Calibration
Search For an ISO?IEC 17025 Acrredited Lab
Visit Preferred Accreditation
Body Website
Search Accredited Laboratory
Database
Search for Laboratory
Capability
Verify Scope of Accreditation Contact the Laboratory
Determine the Measurement functions that require Traceability

14. Conclusion
Measurement Traceability is an important requirement of ISO/IEC 17025 accreditation. It affects
the confidence in your measurement results and the magnitude of your uncertainty estimates.
Without traceability, a laboratory can claim anything they want in a test or calibration report.
With traceability and the independent verification of an accreditation or inspection body, One
can ensure the health and safety of the mankind.

15. Thank you.