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

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Presentation transcript:

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

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

© 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 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.

© 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

© 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

© 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

© 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:

© 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.

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

© 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

© NMISA 2010 Behaviour of comparison standards

© NMISA 2010 Behaviour of comparison standards

© NMISA 2010 Behaviour of comparison standards

© NMISA 2010 Behaviour of comparison standards

© NMISA 2010 Behaviour of comparison standards

© 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:

© 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

© NMISA 2010 Behaviour of comparison standards Std resistor /10/099,999 95mΩ0,000 1mΩ- 0, mΩ0,000 03mΩ /10/091, Ω0, Ω 0, Ω0, Ω /10/0910, kΩ0,000 01kΩ- 0, kΩ0, kΩ /10/091, MΩ0, MΩ- 0, MΩ0, MΩ /10/091,000 06GΩ0,000 08GΩ- 0, GΩ0,000 03GΩ Parameters for behaviour of comparison standards

© 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 Reference value /05/ NMISA /06/ /07/ /07/ /07/ /07/ /07/ /08/ NMISA /08/ /08/ /09/ /09/ /10/ NMISA /10/ /10/ /10/ /11/ NMISA /11/ /01/ /01/ /02/ /02/ /03/ NMISA /03/ /03/ NMISA

© 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 Reference value /05/ NMISA /06/ /07/ /07/ /07/ /07/ /07/ /08/ NMISA /08/ /08/ /09/ /09/ /10/ NMISA /10/ /10/ /10/ /11/ NMISA /11/ /01/ /01/ /02/ /02/ /03/ NMISA /03/ /03/ NMISA

© 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 Reference value /05/ NMISA /06/ /07/ /07/ /07/ /07/ /07/ /08/ NMISA /08/ /08/ /09/ /09/ /10/ NMISA /10/ /10/ /10/ /11/ NMISA /11/ /01/ /01/ /02/ /02/ /03/ NMISA /03/ /03/ NMISA

© 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 Reference value /05/ NMISA /06/ /07/ /07/ /07/ /07/ /07/ /08/ NMISA /08/ /08/ /09/ /09/ /10/ NMISA /10/ /10/ /10/ /11/ NMISA /11/ /01/ /01/ /02/ /02/ /03/ NMISA /03/ /03/ NMISA

© 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 Reference value /05/ NMISA /06/ /07/ /07/ /07/ /07/ /07/ /08/ NMISA /08/ /08/ /09/ /10/ NMISA /10/ /10/ /10/ /11/ NMISA /11/ /01/ /01/ /02/ /03/ NMISA /03/ NMISA

© NMISA 2010 Reported results (10 mΩ )

© NMISA 2010 Reported results (1 Ω )

© NMISA 2010 Reported results (10 kΩ )

© NMISA 2010 Reported results (1 MΩ )

© NMISA 2010 Reported results (1 GΩ )

© NMISA 2010 Conclusion The 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.