US 10,928,430 B2 · High precision decade capacitance standard box

Abstract

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.

Claims20

Dependent claims

A high precision decade capacitor standard box, comprising

six sets of capacitors,
six changeover switches,
output ports,
a metal shielding case, wherein the six sets of capacitors are inside the metal shielding case, and
an outer shell welded to the metal shielding case to form a common ground;
wherein
each set of capacitors includes four physical capacitors,
at least one of the physical capacitors has a single-unit capacitance, and
each of the six changeover switches implements decade encoding using any one of any combination of the corresponding four physical capacitors, and includes input terminals that connect to two electrodes of the corresponding four physical capacitors and output terminals that connect to output ports of the capacitor standard box to provide selected capacitance values in any integer from 0 to 10 times that of the single-unit capacitance.

6 more elements

A high precision decade capacitor standard box, comprising:

six sets of capacitors,
six changeover switches, wherein each of the changeover switches comprises a metal case and a multiple-ceramic-disc switch inside the metal case,
a metal wall that separates the metal case into two compartments and divides the multiple-ceramic-disc switch into two equal parts,
output ports, and
a plurality of dials configured to select an output capacitance from the six changeover switches, wherein:
each set of capacitors includes four physical capacitors,
at least one of the physical capacitors has a single-unit capacitance,
each of the six changeover switches implements decade encoding using any one of any combination of the corresponding four physical capacitors, has a compensation function that includes an open circuit and a short circuit, and includes input terminals that connect to two electrodes of the corresponding four physical capacitors and output terminals that connect to output ports of the capacitor standard to provide selected capacitance values in any integer from 0 to 10 times that of the single-unit capacitance, and
each of the multiple-ceramic-disc switches includes multiple discs in each of the two compartments, one of the multiple discs in each compartment connects to one of the output terminals, and other ones of the multiple discs in each compartment connect to corresponding ones of the input terminals.

6 more elements

Dependencies are inferred from the claim text.

High precision decade capacitance standard box

Life of this patent

High precision decade capacitance standard box

Life of this patent

Abstract

Claims20