ISO 3:1973 PREFERRED NUMBERS – SERIES OF PREFERRED NUMBERS

Renard series is a system of preferred numbers dividing an interval from 1 to 10 into 5, 10, 20, or 40 steps. This set of preferred numbers was proposed in 1877 by French army engineer Colonel Charles Renard. His system was adopted by the ISO in 1949 to form the ISO recommendation R3, first published in 1953 or 1954, which evolved into the international standard ISO 3. Renard's system of preferred numbers divides the interval from 1 to 10 into 5, 10, 20, or 40 steps. The factor between two consecutive numbers in a Renard series is approximately constant (before rounding), namely the 5th, 10th, 20th, or 40th root of 10 (approximately 1.58, 1.26, 1.12, and 1.06, respectively), which leads to a geometric sequence. This way, the maximum relative error is minimized if an arbitrary number is replaced by the nearest Renard number multiplied by the appropriate power of 10. One application of the Renard series of numbers is to the current rating of electric fuses.

The most basic R5 series consists of these five rounded numbers, which are powers of the fifth the root of 10, rounded to two digits. Note that the Renard numbers are not always rounded to the closest three-digit number to the theoretical geometric sequence:

R5: 1.00 1.60 2.50 4.00 6.30

DIRECTORY OF ISO REGISTRARS OR CERTIFICATION BODIES

A Certification body is nothing but a registrar that is competent and authorised to issue Certification on Management System after successful completion of the Management System Audit.

There are few criteria’s which distinguish the ISO registers from one another:

1) 100% success rate on Project Completion- They should be having 100% success rate on project completion with full efficiency. To deliver project on time you need people who are disciplined and punctual, also having a high standard of understanding of the management systems. 

2) Competent Auditors within the organization- They should be having competent auditors for the auditing of their clients. Most of the organisations spend least on auditors and more on the marketing. That needs to be opposite, Organisations need to spend more on the qualified auditors in their payroll.

3) Auditors on every industry sector- There should be auditors or auditor from every industry sector, they should be aware of all the technical informations that are needed for the auditing purpose. The auditor must be updated with standard specific information that are also need to audit firms.

The list below is the list of Registers who are operational in India(some) as well as Globally in ISO Auditing, Certification and Testing

1.    PECB (Global)

2. British Standards Institution (Global)

3. DNV GL (Global)

4. DQS Inc (Global)

5. NSF- ISR (Global)

6. Alcumus (Britain)

7. TUV Rheinland (Global)

8. TUV SUD (Global)

9. TUV NORD (Global)

10. DAS Certification (Global)

11. Certification Europe (Global)

12. Certification International (Global)

13. TUV Management Service (Global)

14. EAGLE Certification Group (Global)

15. ABS Quality Evaluations Inc (Global)

16. Intertek Systems Certification (Global)

17. Alliance International Registrar (Global)

18. American Global Standards LLC (Global)

19. Bureau of Assessment Services (Global)

20. The Registrar Company Inc (North America)

21. Bureau Veritas Certification (Global)

22. Guardian Independent Certification GIC (Global)

23. International Quality Registrars Corporation (Global)

24. Government and Military Certification Systems (Global)

25. Advantage International Registrar (North America)

26. RoyalCert International Registrars (Global)

27. Zenith Quality Assessors Pvt Ltd (India)

28. International Certifications Ltd (Global)

29. Underwriters Laboratories Inc (Global)

30. Performance Review Institute (Global)

31. Smithers Quality Assessments (USA)

32. NSAI Inc (North and South America)

33. KVQA Pvt. Ltd (India)

34. URS Pvt. Ltd (India)

Disclaimer:

ISO Guides does not certify or guarantee the Competence or Expertise of the organizations listed on our blog. This is for informative purposes only. We (Iso Guides) will not be responsible for any losses that may have caused due to Business Association of any of the above companies for any Service or Product which are acquired in any form, either direct or indirect.