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Hamon-Guarded 10 \times 100 \hbox {M}\Omega Network to Increase the Accuracy of the Transfer of the Resistance Unit up to 1 \hbox {G}\Omega at INRIM

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2 Author(s)
Capra, P.P. ; Ist. Naz. di Ricerca Metrologica, Torino, Italy ; Galliana, F.

In the framework of the revision and optimization of the measurement techniques for high-resistance measurements at the National Institute of Metrological Research (INRIM), a 100 MOmega-step Hamon-guarded network was projected and built. With this transfer standard, the 2sigma uncertainty of the maintained 1 GOmega standard at INRIM is now on the order of 7.0 times 10-6 at a measurement voltage of 100 V. Details of the Hamon network and stability data in parallel configuration are given and discussed. The result of a verification of the performance of the Hamon network with a measurement method based on a digital multimeter (DMM) and a dc voltage calibrator (DcVC) is reported. A description of the measurement steps from 10 kOmega to 1 GOmega together with an uncertainty budget is also reported.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:58 ,  Issue: 8 )