A 100 MΩ step hamon guarded network to improve the traceability level of high resistance up to 1GΩ

  1. French College of Metrology
  1. P. P. Capra*,
  2. F. Galliana* and
  3. M. Astrua*

Published Online: 3 FEB 2010

DOI: 10.1002/9780470611371.ch45

Transverse Disciplines in Metrology

Transverse Disciplines in Metrology

How to Cite

French College of Metrology (2010) A 100 MΩ step hamon guarded network to improve the traceability level of high resistance up to 1GΩ, in Transverse Disciplines in Metrology, ISTE, London, UK. doi: 10.1002/9780470611371.ch45

Author Information

  1. National Institute of Metrological Research str. delle Cacce 91–10135 Turin, Italy

*Tel.: +39 011 3919424 – fax: +39 011 346384

Publication History

  1. Published Online: 3 FEB 2010
  2. Published Print: 1 JAN 2009

ISBN Information

Print ISBN: 9781848210486

Online ISBN: 9780470611371

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Keywords:

  • hamon resistor;
  • guarding system;
  • metrological validation;
  • calibration;
  • resistance traceability

Summary

At INRIM, a 100 MΩ step Hamon, guarded resistor was developed and metrologically validated. With it the traceability level of the maintained 1 GΩ at INRIM improved from 8ṁ10-6 to 7ṁ10-6. The guarding system is a chain of 10 MΩ resistors. The main 100 MΩ resistors are surrounded by two metal rings driven to guard potentials so the leakage resistance in parallel with them is fragmented in three parts. In two of these the leakage current is sensibly limited and the third portion is in parallel with the guard resistors. Details of the development of the Hamon, stability data in parallel and series configurations and a metrological validation with DMM-Calibrator-based method are given.