Capacitance Standard Box Output Device with Shielded Interface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current capacitance standard boxes face high uncertainty due to complex changeover switch structures, numerous leading wires, and inadequate shielding, which limits their precision and accuracy in capacitance measurement and calibration.
Innovation Solution
A capacitance standard box output device with a simplified changeover switch and reduced number of standard capacitors, utilizing a shielded interface and a welded metal sheet shield box to minimize distributed capacitance and error, featuring a ceramic band switch with a ten-layer structure and at least four precision capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a decimal changeover switch with ten capacitors is used to provide 11 capacitance values, then the capacitance range and versatility are improved, but the device complexity and distributed capacitance increase
Solution Approach 1:
The patent merges multiple capacitor functions into a single integrated capacitor with multiple terminals. Instead of using ten separate capacitors that need to be switched, the invention uses one capacitor with terminals divided into first and second groups, where the capacitor can be connected in different configurations (series/parallel) to provide multiple capacitance values. This reduces the number of components and simplifies the changeover switch structure.
Solution Approach 2:
The single integrated capacitor serves multiple functions by providing different capacitance values through different terminal connections. The capacitor can operate in various modes (series connection, parallel connection, or individual terminal connections) to provide 11 different capacitance values, making one component perform the work of ten separate capacitors.
2Adaptability or versatility
If ten standard capacitors are connected through a changeover switch, then 11 capacitance values can be obtained, but the number of leading wires increases to 20, introducing more distributed capacitance and error
Solution Approach 1:
The patent combines ten separate capacitor connections into a single capacitor with multiple terminals. Instead of needing twenty leading wires to connect ten capacitors, the invention uses a reduced number of wires to connect the terminals of one capacitor, significantly reducing the quantity of leading wires and associated distributed capacitance.
3Adaptability or versatility
If a complex changeover switch structure is used to select between ten capacitors, then capacitance selection flexibility is improved, but manufacturing precision and uncertainty worsen due to more connection points
Solution Approach 1:
The patent reduces the number of connection points by using a single capacitor instead of ten. Fewer connection points mean fewer potential sources of manufacturing error and lower uncertainty. The changeover switch only needs to manage connections to one capacitor's terminals rather than ten separate capacitors, improving manufacturing precision.
4Adaptability or versatility
If ten input wires pass through the shield box, then all capacitors can be connected, but the shield effect is degraded and error is introduced
Solution Approach 1:
The patent reduces the number of wires penetrating the shield box from ten to a much smaller number by using a single integrated capacitor. This minimizes the degradation of the shield box's protective effect and reduces the introduction of external electromagnetic interference and distributed capacitance.
Data Source
AI summary
The invention discloses a capacitance standard box output device. The number of standard capacitors is reduced, so that the structure of a changeover switch is simplified, and the number of connection wires is reduced, so as to improve the shield effect and reduce uncertainty. The technical proposal of the invention is as follows: The capacitance standard box output device comprises a changeover switch and precision capacitors, wherein the changeover switch is placed in a shield box; the shield box has an input terminal and an output terminal; the input terminal is connected to the changeover switch and the precision capacitor; the output is connected to the changeover switch and outputs the capacitance selected by the changeover switch; the selected capacitance is a product of a unit capacitance and an arbitrary integer value between 0 and 10; the number of the precision capacitors is from 4 to 9, and at least one capacitor is of a unit capacitance. The invention is mainly used for the capacitance standard box to output more accurate capacitance.