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Voltage measuring apparatus with temperature compensation plate

A voltage measuring instrument, temperature compensation technology, applied in the direction of AC/DC potential difference measurement device, etc., can solve the problems of non-independent error, inconvenient identification and maintenance, resolution limitation, etc.

Inactive Publication Date: 2014-10-15
FUYANG XINGYUAN INSTR BUSINESS DEPT
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Currently, for a voltage measuring instrument with five step discs, on the connection between the five step discs, the intermediate disc is generally switched by a switch, thus resulting in Variation in contact resistance, limiting resolution
In order to overcome this problem, a large electric brush is generally used to increase the contact area, and a silver-copper composite material is used; the application number 200810121911.4 discloses a new method for a voltage measuring instrument with five step discs to solve the deterioration of the switch contact resistance. The five stepping discs are 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 are in the 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 disk 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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  • Voltage measuring apparatus with temperature compensation plate

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Experimental program
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Effect test

Embodiment 1

[0010] Embodiment 1, in Fig. 1, when any one of the last four stepping discs between nodes A and B rotates, the increased resistance of the current flowing through the measuring disc is equal to the reduced resistance of the current flowing through the substituting disc , and vice versa, therefore, regardless of the display value of the last four stepping disks, the resistance value of the stepping disk between node A and node B remains unchanged, which can ensure that no matter what the display value of the last four stepping disks is set , the resistance ratio of each stepping disk is basically unchanged, and the current flowing through each stepping disk is basically unchanged.

[0011] The standard operating current of the voltage measuring instrument is designed to be 10mA, and when it is in the ×0.1 range, it passes through the 6.91Ω resistor R from node C 8 , Five stepping discs to node B resistance is 909Ω, connected to double pole double throw switch K 1 Medium K 1-...

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Abstract

The invention discloses a voltage measuring apparatus with a temperature compensation plate for measuring a direct current voltage. Each of four rear stepping plates of the voltage measuring apparatus with the temperature compensation plate is composed of a measuring plate and a replacing plate which is structurally identical to the measuring plate, and after the corresponding contacts on the measuring plates and the replacing plates of the four rear stepping plates are connected with each other, three stepping plates do not have resistance. By means of the voltage measuring apparatus with the temperature compensation plate, the influence of the lead resistance in the voltage measuring apparatus, the switch contact resistance and variation, and the thermal electromotive force on the voltage measuring apparatus can be neglected.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for a voltage measuring instrument with five stepping disks, the connection between the five stepping disks is generally switched by a switch in the middle disk, which will cause a change in contact resistance and limit the resolution. In order to overcome this problem, a large electric brush is generally used to increase the contact area, and a silver-copper composite material is used; the application number 200810121911.4 discloses a new method for a voltage measuring instrument with five step discs to solve the deterioration of the switch contact resistance. The five stepping discs are 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 are in the The bridge circuit is formed in the ci...

Claims

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Application Information

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