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© NMISA 2010 Report on results of the 2009- 2010 national comparison on resistance measurements Alexander Matlejoane.

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Presentation on theme: "© NMISA 2010 Report on results of the 2009- 2010 national comparison on resistance measurements Alexander Matlejoane."— Presentation transcript:

1 © NMISA 2010 Report on results of the 2009- 2010 national comparison on resistance measurements Alexander Matlejoane

2 © NMISA 2010 Introduction Participants Comparison reference values Reference values uncertainty Behaviour of comparison standards Reported results Conclusion

3 © NMISA 2010 Introduction The NMISA conducted a national comparison on 10 mΩ, 1 Ω, 10 kΩ, 1 MΩ and 1 GΩ resistance measurements on behalf of SANAS. The comparison measurements started in May 2009 and were completed in March 2010. This report presents the method used for calculation of reference values and associated measurement uncertainties, behaviour of comparison standards during the measurement period and results reported by participants.

4 © NMISA 2010 Participants Concilium Technologies (Pty) Ltd Denel Aerospace Systems Etecsa Services Eskom EDFS-Western Region Metrology Standards Laboratory Eskom Enterprices (Pty) Ltd HJR Microptic cc Inala Service a division of Inala Technologies (Pty) Ltd, Cape Town

5 © NMISA 2010 Participants Inala Service a division of Inala Technologies (Pty) Ltd, Midrand Intercal Intercalibration (Natal) Pty Ltd Major Tech National Metrology Institute of South Africa Powertech Transformers (Pty) Ltd Protea Electronics

6 © NMISA 2010 Participants Repair and Metrology Services (Pty) Ltd Repcal Services cc Telkom Laboratories, Pretoria Telkom Laboratories, Cape Town Tellumat (Pty) Ltd Testing Metrology Technology cc T/A T-Met TRAC Laboratories cc

7 © NMISA 2010 Comparison reference values Each comparison reference value was assigned by calculating the weighted mean of the NMISA measurement results using the following equation:

8 © NMISA 2010 Comparison reference values Where: is a number allocated to successive NMISA measurement results is the successive NMISA measurement result is the uncertainty of successive NMISA measurement results and is the calculated comparison reference value.

9 © NMISA 2010 Reference values uncertainty Each reference value uncertainty was calculated using the following equation

10 © NMISA 2010 Reference values uncertainty Where: is the estimated drift of each comparison standard during the measurement period is a number allocated to successive NMISA measurement results is the uncertainty of successive NMISA measurement results and is the expanded uncertainty of the reference value

11 © NMISA 2010 Behaviour of comparison standards

12 © NMISA 2010 Behaviour of comparison standards

13 © NMISA 2010 Behaviour of comparison standards

14 © NMISA 2010 Behaviour of comparison standards

15 © NMISA 2010 Behaviour of comparison standards

16 © NMISA 2010 Behaviour of comparison standards Despite of the deviations, most probably due to shock in transit, the behaviour of each standard is approximated by a linear fit through all respective NMISA measurements using the formula:

17 © NMISA 2010 Behaviour of comparison standards Where: is a specific NMISA measurement date is the average of the NMISA measurement dates is the estimated resistance value is the average of the NMISA measurements is the estimated drift per day

18 © NMISA 2010 Behaviour of comparison standards Std resistor 0056127/10/099,999 95mΩ0,000 1mΩ- 0,000 000 1mΩ0,000 03mΩ 493501827/10/091,000 035 1Ω0,000 000 2Ω 0,000 000 004Ω0,000 001Ω 506503827/10/0910,000 105kΩ0,000 01kΩ- 0,000 000 005kΩ0,000 002kΩ 780300327/10/091,000 001MΩ0,000 004MΩ- 0,000 000 002MΩ0,000 000 6MΩ 97042928/10/091,000 06GΩ0,000 08GΩ- 0,000 000 095GΩ0,000 03GΩ Parameters for behaviour of comparison standards

19 © NMISA 2010 Reported results Date Reported value (Ω) Corrected value (Ω) Reference value (Ω) UoM (± µ Ω/Ω) ID Deviation ( µ Ω/Ω) UoM (± µ Ω/Ω) E N value 0.010000004 1 Reference value040.0 21/05/090.01000000 2 NMISA0.1120.0 26/06/090.0100000530.01000006336.4500.1 09/07/090.0100001 411.51000.1 14/07/090.0100000 51.6300.1 19/07/090.0099999 6-8.22000.0 21/07/090.0100016 7161.82000.8 29/07/090.009993 8-697.9400-1.7 04/08/090.009999960.009999989 NMISA-1.89-0.2 12/08/090.0100002 1022.53000.1 26/08/090.0099999 11-7.150-0.1 10/09/090.0100000590.010000091129.2500.2 25/09/090.0100006 1363.84000.2 02/10/090.009999940.0099999814 NMISA-2.09-0.2 08/10/090.00999980.0099999815-1.91001000.0 14/10/090.01000 164.31200000.0 20/10/090.00996 17-3995.520000000.0 03/11/090.009999940.0099999918 NMISA-1.19-0.1 18/11/090.0099996790.00999973119-26.850-0.5 21/01/100.01000 207.220600.0 28/01/100.0099999980.010000071217.2500.1 11/02/100.010001210.0100012922128.85000000.0 23/02/100.01000050.01000062358.04000.1 02/03/100.009999940.0100000224 NMISA2.290.2 09/03/100.010001 25108.58060000.0 15/03/100.009999940.0100000326 NMISA2.690.3

20 © NMISA 2010 Reported results Date Reported value (Ω) Corrected value (Ω) Reference value (Ω) UoM (± µ Ω/Ω) ID Deviation ( µ Ω/Ω) UoM (± µ Ω/Ω) E N value 1.00003490.4 1 Reference value0.00.40.0 21/05/091.0000349 2 NMISA0.00.20.0 26/06/091.00003311.00003303-1.85-0.4 09/07/091.000033 4-2.05-0.4 14/07/091.000035 50.0200.0 19/07/091.000031 6-4.050-0.1 21/07/091.000020 7-15.030-0.5 29/07/091.000032 8-3.02000.0 04/08/091.00003491.00003489 NMISA-0.10.2-0.2 12/08/090.99981 10-225.050-4.5 26/08/091.00004 115.0500.1 10/09/091.000031 12-4.110-0.4 25/09/091.00004 134.92000.0 02/10/091.00003481.000034614 NMISA-0.30.2-0.7 08/10/091.0000441.0000438158.9200.4 14/10/091.00002 16-15.1103000.0 20/10/091.000039 173.92400.0 03/11/091.00003491.000034718 NMISA-0.20.2-0.5 18/11/091.00006161.00006131926.4500.5 21/01/101.00004 204.72600.0 28/01/101.000030251.0000298721-5.020-0.3 11/02/100.999938 22-97.354000.0 23/02/101.000037 231.7500.0 02/03/101.00003561.000035224 NMISA0.30.20.6 09/03/101.00001 25-25.3140000.0 15/03/101.00003571.000035326 NMISA0.40.20.8

21 © NMISA 2010 Reported results Date Reported value (kΩ) Corrected value (kΩ) Reference value (kΩ) UoM (± µ Ω/Ω) ID Deviation ( µ Ω/Ω) UoM (± µ Ω/Ω) E N Value 10.0001051.3 1 Reference value0.01.30.0 21/05/0910.000117 2 NMISA1.210.7 26/06/0910.000090510.00009073-1.45-0.3 09/07/0910.00008 4-2.55-0.5 14/07/0910.00008 5-2.520-0.1 19/07/0910.00007 6-3.550-0.1 21/07/0910.00005 7-5.530-0.2 29/07/0910.00008 8-2.5500.0 04/08/0910.000101 9 NMISA-0.41-0.2 12/08/0910.00008 10-2.5500.0 26/08/0910.0002 119.5500.2 10/09/0910.00010 12-0.910-0.1 25/09/0910.0009 1379.52000.4 02/10/0910.00009810.00009914 NMISA-0.70.8-0.4 08/10/0910.0003310.0003311522.6201.1 14/10/0910.00008210.00008316-2.23010.0 20/10/0910.00009 17-1.44-0.3 03/11/0910.00010310.00010418 NMISA-0.10.80.0 18/11/0910.00015 194.6500.1 21/01/1010.00014710.000148204.360.020.1 28/01/1010.00006810.00006921-3.620-0.2 11/02/109.99985 22-25.4400-0.1 15/02/1010.00012 231.6500.0 02/03/1010.00010510.00010624 NMISA0.10.60.0 09/03/1010.0000 25-10.42000.80.0 15/03/1010.00010410.00010526 NMISA0.00.60.0

22 © NMISA 2010 Reported results Date Reported value (MΩ) Corrected value (MΩ) Reference value (MΩ) UoM (± µ Ω/Ω) ID Deviation ( µ Ω/Ω) UoM (± µ Ω/Ω) E N value 1.0000012 1 Reference value0.02 21/05/091.000001 2 NMISA-0.34-0.1 26/06/091.00000511.000005233.97.10.5 09/07/091.00000 4-1.21000.0 14/07/091.000006 54.8300.2 19/07/091.00000 6-1.21000.0 21/07/090.999990 7-11.250-0.2 29/07/091.000006 84.81000.0 04/08/091.000002 9 NMISA0.840.2 12/08/091.000002 100.91000.0 26/08/091.00000 11-1.1500.0 10/09/091.000002 120.91000.0 25/09/091.000018 1317.02000.1 01/10/091.000001 14 NMISA0.04 08/10/091.000001 150.01000.0 14/10/090.99999290.999993316-8.13000.0 20/10/090.999982 17-19.060-0.3 03/11/091.000001 18 NMISA0.140.0 18/11/091.000005 194.1500.1 21/01/101.00000 20-0.72000.0 28/01/100.99999770.999998321-3.050-0.1 11/02/100.9999450.99994622-55.7400-0.1 15/02/101.0000291.0000302328.31000.3 02/03/101.0000021.00000324 NMISA1.340.3 09/03/100.99998 25-20.62000.010.0 17/03/101.0000011.00000226 NMISA0.440.1

23 © NMISA 2010 Reported results Date Reported value (GΩ) Corrected value (GΩ) Reference value (GΩ) UoM (± µ Ω/Ω) ID Deviation ( µ Ω/Ω) UoM (± µ Ω/Ω) E N value 1.0000631 1 Reference value0.0310.0 21/05/091.00006 2 NMISA-2800.0 26/06/090.99696 3-30981000-3.1 09/07/090.9997 4-3571000-0.4 14/07/090.999630.999645-4271000-0.4 19/07/090.99830.998316-175612000-0.1 21/07/091.0021 7204412001.7 29/07/090.99860.9986078-14553700-0.4 04/08/091.000091.000109 NMISA35800.4 12/08/090.9990 10-10545000-0.2 26/08/091.0151.01501111494630005.0 10/09/091.0005 1244950000.1 01/10/091.000071.0000813 NMISA21800.2 08/10/090.999540.9995514-509500 14/10/090.9934570.99347115-65913000-2.2 20/10/090.99820.99821416-18486000-0.3 03/11/091.000061.0000817 NMISA14800.2 18/11/090.987 18-1304450000-0.3 21/01/101.0015 19146170000.2 28/01/100.9996140.99963820-4245000-0.1 23/02/100.9984 21-16361500-1.1 02/03/101.000051.0000822 NMISA15700.2 18/03/101.000051.0000823 NMISA16700.2

24 © NMISA 2010 Reported results (10 mΩ )

25 © NMISA 2010 Reported results (1 Ω )

26 © NMISA 2010 Reported results (10 kΩ )

27 © NMISA 2010 Reported results (1 MΩ )

28 © NMISA 2010 Reported results (1 GΩ )

29 © NMISA 2010 Conclusion The 2009-2010 national comparison on resistance measurements was completed as scheduled. Submitted results agree with the reference values to within reported measurement uncertainties with relatively few exceptions.

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