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Micro-voltage measuring device

A voltage measurement, tiny technology, applied in the direction of AC/DC potential difference measurement devices, etc., can solve problems such as uncertainty, contact resistance deterioration, resolution limitation, etc.

Inactive Publication Date: 2014-10-29
FUYANG XINGYUAN INSTR BUSINESS DEPT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, for a tiny voltage measuring device with five stepping disks, the connection between the five stepping disks is generally switched by a switch in the middle disk, which will cause the deterioration of the contact resistance and limit the resolution.
In order to overcome this problem, large brushes are generally used to increase the contact area, and silver-copper composite materials are used; application number 200810121911.4 discloses a new method for solving the deterioration of switch contact resistance by a tiny voltage measuring device with five step discs, Its five stepping discs are all composed of measuring discs and substituting discs, excluding auxiliary discs, each measuring disc and substituting discs have resistance, and the measuring discs and substituting discs on its five stepping discs The bridge circuit is formed in the circuit. Its biggest problem is that the error is not independent. Once the indication value of a certain point of the measuring panel is out of tolerance, it is impossible to determine which resistance is caused by the out-of-tolerance, which brings inconvenience to identification and maintenance.

Method used

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  • Micro-voltage measuring device

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Experimental program
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Effect test

Embodiment 1

[0009] Embodiment 1, in Fig. 1, when any one of the five stepping discs between nodes A and B rotates, the resistance increased by the current flowing through the measuring disc is equal to the reduced resistance of the current flowing through the substituting disc, and vice versa Also, therefore, no matter what indication value is set on the five step discs, the resistance value of the step disc between node A and node B remains unchanged, which can ensure that no matter what indication value is set on the five step discs, each step The disk resistance ratio is basically unchanged, and the current flowing through each stepping disk is also guaranteed to be basically unchanged.

[0010] The resistance ratio of each stepping disc: the first stepping disc: the second stepping disc: the third stepping disc: the fourth stepping disc: the fifth stepping disc = 1:10:10 2 : 10 3 : 10 4 , so, flow through each step disc current ratio: the first step disc: the second step disc: the t...

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Abstract

Disclosed is a micro-voltage measuring device for DC (direct current) voltage measurement. According to the micro-voltage measuring device, every step plate is composed of a measuring plate and a replacing plate which are of the same structure; a resistor is welded between the contacts of the measuring plate and the replacing plate of the first step plate, and the others of the step plates are not provided with resistors, so that the influence of internal wire resistance, switch contact resistance and variation and thermoelectric force of the micro-voltage measuring device on the micro-voltage measuring device can be negligible.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for a tiny voltage measuring device with five stepping disks, the intermediate disk generally adopts a switch for the connection between the five stepping disks, which will cause the deterioration of the contact resistance and limit the resolution. In order to overcome this problem, large brushes are generally used to increase the contact area, and silver-copper composite materials are used; application number 200810121911.4 discloses a new method for solving the deterioration of switch contact resistance by a tiny voltage measuring device with five step discs, Its five stepping discs are all composed of measuring discs and substituting discs, excluding auxiliary discs, each measuring disc and substituting discs have resistance, and the measuring discs and substituting discs on its five stepping discs The bridge circuit is formed in the circuit. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R17/20
Inventor 袁乐香骆孝峰
Owner FUYANG XINGYUAN INSTR BUSINESS DEPT
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