1. CMCs and the BIPM Key Comparison Database Raul Fernando Solís Betancur rsolis@cenamep.org.pa 2015

2. CIPM MRA Is the International Committee for Weights and Measures Mutual Recognition Arrangement. Is the framework through which National Metrology Institutes demonstrate the international equivalence of their measurement standards and the calibration and measurement certificates they issue. The CMC is the final product of all work in the CIPM MRA. 6/9/20152

3. Bureau International des Poids et Mesures International organization that resides in Paris, France. Coordinate the international metrology activities like comparisons, the units, the measurement capabilities, etc. Keeps a database of all comparison, calibration and measurement capabilities and provides worldwide access to the results. 6/9/20153

4. The BIPM Key Comparison Data Base Containing Appendices A, B, C and D of the CIPM MRA. Appendix A: Participants in the CIPM MRA. Appendix B: Key and supplementary comparisons. Appendix C: Calibration and Measurement Capabilities – CMCs. Appendix D: List of key comparisons. 6/9/20154

5. Comparisons (I) They are the best way to show the level of your measurement skill. You need to participate in almost one comparison to validate yours capabilities and to include your CMC in the database. Under the CIPM MRA, the comparison can be Key or supplementary. The result are published in the Appendix B. 6/9/20155

6. Comparison (II) CIPM Key Comparison – Comparison between NMIs with the highest level of skills in the measurement or the unit realization. – The result of the comparison is a reference value of the quantity. MRO Key Comparison – Comparison between NMIs in a RMO when one or more of the participants are in a CIPM Key comparison. – Don’t change the reference value obtained in the CIPM Key comparison. 6/9/20156

7. Comparison (III) Supplementary Comparison: Is the comparison that helps link the NMI capabilities with the reference values (bilateral, pilots experiments, etc.). All of the participants of all comparison must be signatory of the MRA. If one of the participants isn't a MRA signatory, the comparison is only valid if you don’t include his data in the comparison result. 6/9/20157

8. Comparison (IV) 6/9/20158

9. Comparison (V) The Universal Time Coordinated is our reference value (Key comparison CCTF-K001.UTC, started since 1977 and still ongoing). The Circular T is the official document that reports the key comparison results. The UTCr is a rapid solution for the laboratories that seek to steer their definitions close to the UTC. 6/9/20159

10. Circular T 6/9/201510

11. UTCr results 6/9/201511

12. SIM comparisons (I) The Time & Frequency Network is an pilot experiment that acts like a regional comparison. SIMTFN is a method that allow bilateral comparison between the T&F Key Comparison participants and the rest of the laboratories. The objective of this comparison is the increase of the calibration capabilities of all T&F laboratories in our region. The results are published every hour in the SIMTF webpage. 6/9/201512

13. SIM comparisons (II) 6/9/201513

14. SIM comparisons (III) 6/9/201514

15. Calibration and Measurement Capability (I) The MRA seeks to bring equivalence in all the measurements in the world. The only way to ensure that this happens is to normalize our way to measure and express the results. The Calibration and Measurement Capability (CMC) is the final product of these process. 6/9/201515

16. Calibration and Measurement Capability (II) The BIPM has a list of CMC for the 9 metrology areas. Every NMI that is part of the MRA and can provide enough evidence of their measurement skills in these areas can register their capabilities in the Appendix C. The SIM region has only 6 laboratories with CMC in the T&F metrology area (approximately 45 in total around the world, December 2014). 6/9/201516

17. Calibration and Measurement Capability (III) For the declaration of your CMC you need: To be a signatory of the MRA (member or associate state). A peer review in the service that you want to publish (is better if the evaluator is from other NMI with a CMC or a good reputation in the metrology area). To fulfill the quality assessment under the ISO/IEC 17025. 6/9/201517

18. Calibration and Measurement Capability (IV) For the approval of your CMC you need: A comparison with some NMI with link to the UTC. The approval of your Quality System from the SIM QSTF. The approval of your technical capabilities from all RMOs. Fulfilling all these points grants the incorporation of your CMC in the Appendix C. 6/9/201518

19. Calibration and Measurement Capability (V) The CMC only had a vitality of 5 years. After that you need to perform the same exercise to maintain yours CMC. The values can be updated for better or for worse. – This depend of the actual situation in your laboratory (changes in your equipment, environmental condition, calibration methods, etc.). 6/9/201519

20. Calibration and Measurement Capability (VI) To demonstrate vitality you need to show record of your work by: Comparisons. Publications of your work (journals, conference proceedings, etc.). Participation in the Working Groups. Advisories / third party audits. Trainings. Continuous improvement through R&D. 6/9/201520

21. Classification of services in Time and Frequency In the T&F metrology area, the measurement capabilities are divided in three branches (version 1.0 of December 2002): Time scale difference: synchronization with UTC or UTC(k). Frequency: frequency difference. Time interval: duration of events. 6/9/201521

22. Branch: 1 Time scale difference 1.1. Local clock 1.1.1. Local clock vs. UTC(NMI) 1.1.2. Local clock vs. UTC 1.2. Remote clocks 1.2.1. Remote clock vs. UTC(NMI) 1.2.2. Remote clock vs. UTC 6/9/201522

23. Branch: 2 Frequency 2.1. Standard frequency source 2.1.1. Local frequency standard 2.1.2. Remote frequency standard 2.2. General frequency source 2.2.1. General frequency source 2.3. Frequency meter 2.3.1. Frequency counter 2.3.2. Frequency meter 6/9/201523

24. Branch: 3 Time interval (I) 3.1. Period source 3.1.1. Period source 3.2 Time Interval source 3.2.1. Rise/fall time source 3.2.2. Pulse width source 3.2.3. Time difference source 3.2.4. Delay source 6/9/201524

25. Branch: 3 Time interval (II) 3.3. Period meter 3.3.1. Period meter 3.4 Time Interval meter 3.4.1. Rise/fall time meter 3.4.2. Pulse width meter 3.4.3. Time difference meter 3.4.4. Delay meter 6/9/201525

26. The CMC sheet (I) 6/9/201526

27. The CMC sheet (II) 6/9/201527

28. Calibration or Measurement Service Quantity/ Class Instrument or Artifact Instrument Type or Method 6/9/201528

29. Calibration or Measurement Service Quantity / Class: basically the branch that you want to measure (frequency, time interval or time scale difference). Instrument or Artifact: Is the device under test but in terms of the sub points of the branch (1.x., 2.x., 3.x., 1.x.x., 2.x.x and 3.x.x.). Instrument Type or Method: How you perform the comparison or the data acquisition (direct frequency measurement, direct comparison against UTC(k), etc). 6/9/201529

30. Measurement Level or Range Measurand Level or Range Minimum value Maximum value Units 6/9/201530

31. Measurement Level or Range Minimum Value: the lower number that you can acquire in your measurement range. Maximum value: the highest number that you can acquire in you measurement range. Units: the units of the values that you acquire. 6/9/201531

32. Measurement Conditions/Independent Variable ParameterSpecifications 6/9/201532

33. Measurement Conditions/Independent Variable Parameter: every variable or condition that limit your measurement capability (gate time, measurement time, averaging time, signal amplitude, line impedance, slew rate, etc.). Specification: the limits of the parameters in yours measurement. 6/9/201533

34. Expanded Uncertainty ValueUnits Coverage Factor Level of Confidence Is the expanded uncertainty a relative one? 6/9/201534

35. Expanded Uncertainty Value: the uncertainty’s value that you want to declare. Units: the units of your declared uncertainty. Coverage factor: the value that you use to expand your standard uncertainty (usually k=2). Level of Confidence: usually is 95%. Is the expanded uncertainty a relative one?: Indicates if the value of uncertainty has turned relative. 6/9/201535

36. Reference Standard used in calibration Standard Source of traceability 6/9/201536

37. Reference Standard used in calibration Standard: your time and frequency reference. Source of Traceability: The INM is the one that has traceability to the time unit. 6/9/201537

38. List of Comparisons supporting this measurement/calibration service 6/9/201538

39. List of Comparisons supporting this measurement/calibration service List of Comparisons supporting this measurement / calibration service: The comparison that you have participated in to show your measurement capabilities to another NMI. 6/9/201539

40. Comments to be published via the web page 6/9/201540

41. Comments to be published via the web page Comments to be published via the web page: information about the calibration, uncertainty, and when the CMC is published. 6/9/201541

42. Administration Administration NMI Service Identifier Service Category NMI Review Status Review Comments 6/9/201542

43. Administration NMI Service Identifier: The internal ID for the NMI to identify this service. Service Category: The CMC service identifier. NMI: The National Metrology Institute or delegated metrology institute that publishes the CMC. Review Status: the actual situation of the verification of your CMC. Review Comments: aditional information about the verification process. 6/9/201543

44. Example of filling a CMC Sheet 6/9/201544

45. Example of filling a CMC Sheet 6/9/201545

46. How the world see your CMC 6/9/201546

47. Discussion What is the individual need of the NMI to register your CMC in the KCDB?. The need for training and technical advising. You can start with a low level capability calibration services like stopwatches, frequency meters or optical tachometers (rubidium oscillator is enough for this). Do you need to increase your measurement capability confidence? Do you need a pilot comparison? Tell us what you think. 6/9/201547

48. Useful links SIM TFWG page: http://tf.nist.gov/sim/http://tf.nist.gov/sim/ BIPM KCDB page: http://kcdb.bipm.org/http://kcdb.bipm.org/ CIPM MRA page: http://www.bipm.org/en/cipm-mra/http://www.bipm.org/en/cipm-mra/ BIPM T&F server page: http://www.bipm.org/en/bipm- services/timescales/time-ftp.htmlhttp://www.bipm.org/en/bipm- services/timescales/time-ftp.html NIST uncertainty of measurements result page: http://physics.nist.gov/cuu/Uncertainty/index.html http://physics.nist.gov/cuu/Uncertainty/index.html 6/9/201548

49. ¡Thanks! 6/9/201549