Electrical Industry Workshop 2020

Training course

This half day workshop aims to address two issues with part 10 of the code that create difficulties for auditing Approved Test Houses against ISO 17025.



Wednesday 18th March - 1:00 - 5:00 pm

Cost - no charge

This half day workshop aims to address two issues with part 10 of the code that create difficulties for auditing Approved Test Houses against ISO 17025. At the heart of the issues is the difficulty in producing scientifically defendable estimates of metering errors, something that MSL has a key interest in ensuring.

The aim of the workshop is to

  • share an understanding of the critical metrology issues
  • discuss preferred options for resolving the issues
  • consider the next steps required to resolve the difficulties

The two issues of particular concern to MSL are:

  • a code requirement to use meter ‘class error’ in some uncertainty calculations, effectively invalidating the uncertainty calculation,
  • an absence of code guidance on using secondary injection instruments for calibrating transformers.

These issues have the potential to affect all Approved Test Houses but are particularly important for class A ATHs where assuring scientifically defendable error estimates is a key requirement of ISO 17025.

It is acknowledged that there are other issues of concern to Approved Test Houses such as transformer burdens, effective comparative certification, uncertainty calculations for class B ATHs and more. These can be discussed as time permits.



Laurie Christian

Principal Research Scientist | Electricity

Laurie has spent 40 years working as a metrologist specialising in electrical measurements. He is responsible for the 10 V Josephson Voltage Standard, which is New Zealand’s standard of dc voltage. In 1997 he spent 10 months working with the team at the NIST, Boulder, Colorado laboratories who developed the Josephson array chip that is the heart of this standard. He has carried out research into developments of this technology that allow the synthesis of arbitrary low-frequency waveforms. Laurie has been active in many areas of electrical metrology, including DC voltage, current and resistance.

In 1999 Laurie developed the Reference Step Method for measuring dc voltage ratios for resistive dividers up to 1000 V and has since then applied it to calibrating both dc voltage sources and meters over the same range. Several NMIs are using this method for dc voltage scaling. In 2006 he applied the core principle of this method to create the Current Reference Step Method, which can be used to scale from a low current to a much higher current (hundreds of amperes). Laurie has been a technical expert for many IANZ accredited electrical calibration laboratories and has peer-reviewed several NMIs in the Asia-Pacific region.

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Tom Stewart

Senior Research Scientist | Electricity

Tom has been working extensively with MSL’s mains energy standard, including its maintenance, calibration and its use for calibration of industry reference energy meters.
He has been actively involved with the metrology requirements needed to support New Zealand’s power industry including those of the Class A and B Approved Test Houses (ATH), whilst liaising with the Electricity Authority (EA) where required.
Tom has been a technical expert for assessment of IANZ accredited laboratories in New Zealand.
Tom has also been involved in supporting MSL’s impedance standards, including the calibration of capacitors, inductors and associated reference equipment.
Recent research has included making accurate voltage measurements to support MSL’s novel Kibble balance (linking the kilogram to the Planck constant). The optional oscillating mode would require high accuracy AC voltage measurements (that would also ultimately support accurate power measurement). This has involved a collaboration with the National Institute of Standards and Technology (NIST), USA to integrate a Programmable Josephson Voltage System (PJVS) into the Kibble balance.
Tom started at MSL in 2008 following his Bachelor of Science and Technology (Electronics and Instrumentation) and Master of Science (Electronics and Computer Systems Engineering) completed at Victoria University of New Zealand.

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Keith Jones

Distinguished Scientist | Electricity

Keith’s early scientific work was with developing primary standards of impedance, starting with a mechanical-based capacitance standard. The discovery of the quantum Hall effect in 1980 (by Klaus von Klitzing) led to a period of intense international research, and Keith contributed to the international effort that ultimately led to the adoption of the quantum Hall effect as the new standard of resistance.

He has significant experience with developing national quality infrastructures from his time spent as Director of MSL and as Chairperson of the Asia-Pacific Metrology Programme. He has provided strategic advice in Malaysia, Chile, the Philippines and Myanmar. Keith has worked closely with the New Zealand electricity supply since 1993 to support the development of metrology codes of practice for metering installations. A significant continuing part of his work has been the provision of training courses and software to assist Approved Test Houses with the certification of metering installations.

Keith has been technical expert or peer reviewer for many IANZ accredited laboratories in New Zealand and as a technical peer reviewer for national metrology institutes in the Asia-Pacific region.

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Date and Venue

To be scheduled

Lower Hutt

MacDiarmid Centre, Callaghan Innovation
69 Gracefield Road, Gracefield
Lower Hutt

  • Free Parking

  • Approximately 45 minute drive from Wellington Airport, 30 minutes from Wellington CBD

This workshop commences at 1:00pm sharp



Catering includes Afternoon Tea.  Please indicate dietary requirements on the registration form.



MSL Electrical Industry Workshop