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A new type of calculable capacitor was initially built at the National Institute of Metrology, China, in cooperation with the National Measurement Institute, Australia. The capacitor realized the SI unit of capacitance at 1 pF, with an uncertainty of 20 parts in $10^{9}$ . A simplified operational approach was used that avoids the complex substitution measuring process with small-value capacitors...
A new type calculable capacitor has been studied and developed at NIM in cooperation with NMIA. The situation and the preliminary results are presented with uncertainty of 20 parts in 109 for realization of the capacitance unit to 1 pF.
This paper describes the design, schematics, and performance of a very low-noise J-EFT preamplifier. The amplifier has a gain flatness better than 1dB in the 500Hz to 1MHz frequency region. Noise measurements on this amplifier yield a voltage noise less 0.5nV/√Hz and current noise less 1fA/√Hz in the 100Hz to 100kHz frequency region. It could be used as the preamplifier of the null detector of AC...
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