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Voltage measuring device with five step panels

A technology of voltage measurement and stepping disk, which is applied in the direction of AC/DC potential difference measurement devices, etc., which can solve the problems of independent errors, inconvenient identification and maintenance, and poor contact resistance.

Inactive Publication Date: 2014-10-22
FUYANG XINGYUAN INSTR BUSINESS DEPT
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] At present, for a voltage measuring device with five stepping disks, the connection between the five stepping disks is generally switched by switches in the middle disk, which will cause the deterioration of the 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 solving the deterioration of the switch contact resistance by a voltage measuring device with five step discs. 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 device with five step panels

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Embodiment 1

[0008] Example 1, in figure 1 , when any one of the last four 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. Therefore, Regardless of the displayed value of the last four stepping discs, the resistance value of the stepping disc between node A and node B remains unchanged, which can ensure that the resistance ratio of each stepping disc will It is basically unchanged, and it is also guaranteed that the current flowing through each step disc is basically unchanged.

[0009] The standard operating current of the voltage measuring device is designed to be 11mA. In the ×1 range, the resistance from node C to node B through five step discs is 102Ω, and from node C through resistance R 6 , resistance R 7 The resistance to node B is 1020Ω, so 10mA working current flows through five step discs, and 1mA work...

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Abstract

The invention provides a voltage measuring device with five step panels. The voltage measuring device with the five step panels is used for measuring DC voltage. The device is characterized in that four rear step panels are all composed of measuring panels, and replacement panels that are structured the same as the measuring panels. According to the voltage measuring device with the five step panels, the measuring panels of the four rear step panels are connected with corresponding contacts on the replacement panels, then three of the four step panels are free of resistance, and therefore, the influence of resistance of an internal lead in the voltage measuring, switch contact resistance and variation, and thermoelectric potential on the voltage measuring device can be ignored.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for a voltage measuring device with five stepping disks, the intermediate disk is generally switched by a switch on the connection between the five stepping disks, which will cause a deterioration of the 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 solving the deterioration of the switch contact resistance by a voltage measuring device with five step discs. 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 forme...

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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