Research on a selectable low-value capacitance standard

In electromagnetic metrology and electronic instrumentation,the stable capacitance standards including the selectable low-value capacitance standard( SLCS) are usually required for calibrating the instrumentations and meters to ensure its measurement accuracy. SLCS is a kind of standard equipment which can output different stable small capacitance values under the same system. This paper adopts the 3-D electrical field simulation software to research on the edge effect around the hole on the screen shutter which is one of the largest uncertainty sources for the SLCS. On basis of the simulation results,the overall mechanical structure for one kind of SLCS has been designed,which can lay a solid foundation for its actual realization.