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A programmable small capacitance standard consisting of several capacitors connected to a 20 channels multiplexer has been developed at LNE. This programmable standard is capable of producing decadic capacitances from 10 aF to at least 10 fF. This paper presents the first phase of the measurements which were performed in order to evaluate the errors introduced by the stray and cross capacitances.
This paper describes the procedure recently introduced at LNE to calibrate low-voltage AC-DC transfer standards from 10 Hz to 1 MHz. Especially, a set of micropotentiometers is under development in order to take into account the voltage level dependence of the standards during the step-down procedure. Uncertainties of the order of 50 µV/V at 10 mV / 1 MHz are expected. First measurement results are...
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