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Distributed precision resistor with low load coefficient and implementation method thereof

A technology of precision resistors and precision resistor elements, which is applied in the field of distributed low load factor precision resistors and its realization, can solve the problems of high price and inconvenient use of resistor devices

Inactive Publication Date: 2015-04-15
NAT INST OF METROLOGY CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the load factor can be up to 10 -7 order of magnitude, and large-size resistors are inconvenient to use and expensive

Method used

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  • Distributed precision resistor with low load coefficient and implementation method thereof
  • Distributed precision resistor with low load coefficient and implementation method thereof
  • Distributed precision resistor with low load coefficient and implementation method thereof

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Embodiment Construction

[0062] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0063] The invention adopts a different technical route from at home and abroad. Instead of amplifying the entire resistance, it uses such figure 1 The distributed structure shown is that many small precision resistance components with the same characteristics and low load factor are connected in parallel to form a chain circuit, and the whole is used as a distributed four-terminal resistor. If the number of components participating in parallel is N, the current through each resistor component participating in parallel is only 1 / N of the total current. Therefore, even if the current passing through the entire four-terminal resistor is large, the current passing through each resistance element participating in parallel is still small, that is, the load distributed on each element is small, and the heat generation of the element and the change in resistance value a...

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Abstract

The invention provides a distributed precision resistor with a low load coefficient and an implementation method thereof, and belongs to the filed of large-current precision measurement. The distributed precision resistor with the low load coefficient is a chain-shaped circuit and is formed by a group of small-type precision resistor components with the low load coefficients in a parallel connection mode, wherein the small-type precision resistor components are the same in characteristic. A special point is arranged in the chain-type circuit, and the resistance of a connecting guide line of the whole chain-shaped circuit can be ignored at the special point. A current lead of the distributed precision resistor with the low load coefficient is arranged at an input end of the chain-shaped circuit, and a voltage lead is arranged at the position of an input end of a corresponding link of the special point. Through the distributed precision resistor with the low load coefficient and the implementation method thereof, the whole resistor can keep the low load coefficient after the parallel and can keep other good performance of the resistor components which participate in the parallel. When resistors of 20 ohms are under the load of 50 Mw, change of a resistance value is only 10-9 orders of magnitude, and the resistors exceed a standard of domestic and overseas products, wherein the resistors are prepared through the method.

Description

Technical field [0001] The invention belongs to the field of high-current precision measurement, and specifically relates to a distributed low-load coefficient precision resistor and an implementation method thereof. Background technique [0002] Large current measurement technology has a wide range of applications. Today, when energy-saving technology is getting more and more attention, high-current precision measurement technology is particularly important. The common method for measuring large currents is to pass the current to be measured through a low-value four-terminal resistor, and measure the voltage drop that the current produces on the resistor. Divide the measured voltage drop by the resistance value of the four-terminal resistor to get the current value of the large current. Such four-terminal resistors are also often referred to as "shunts". To improve the accuracy of this method, the key is to ensure the accuracy of the four-terminal resistance. [0003] The char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/00
Inventor 张钟华王维贺青李正坤韩冰鲁云峰
Owner NAT INST OF METROLOGY CHINA
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