High Precision Decade Capacitance Standard Box

摘要

The invention disclosed a high precision decade capacitor standard box. It comprises 6 sets of physical capacitors, 6 changeover switches, and output ports. Each set of physical capacitors include 4 physical capacitors, at least one capacitor has single-unit capacitance. The changeover switch implements the decade encoding of all the combinations of 4 physical capacitors. The changeover switch has input terminals that connect to two electrodes of physical capacitors, and output terminals that connect to the output ports of capacitor standard box to provide the selected capacitance. The capacitance values can be selected any integer from 0 to 10 times of single-unit capacitance. The decade encoding of all the combinations of 4 capacitors can reduce the number of required capacitors and wires for connecting capacitors. The open and short compensation are adopted in this decade capacitor standard, which minimizes error, improve accuracy, and is convenient for measurement, transport, and field application.