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Potentiometer with three measurement disks

A technology of potentiometer and measuring disc, which is applied in the direction of measuring electric variables, measuring current/voltage, and measuring devices, etc. It can solve the problems of increasing the number of layers of switches with resistance, complex structures of switches and instruments, and increasing the volume of instruments.

Inactive Publication Date: 2007-09-12
程军
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Problems solved by technology

After the two measuring discs are connected, they are connected with the sliding wire disc between the two measuring terminals, so that the brushes on the switch of the stepping disc are excluded from the measuring circuit, and there is no switching between the resistances on the three measuring discs, and There will be no deterioration; since the first and second stepping discs have replacement discs, the number of layers of the first and second stepping discs containing resistance is increased, thereby increasing the volume of the instrument and making the switch and The structure of the instrument becomes complicated, which also brings inconvenience to maintenance

Method used

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  • Potentiometer with three measurement disks

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Embodiment Construction

[0007] In the figure, the measurement panel II is eleven 11Ω end-to-end resistance rings between node A and node B. When the measurement panel II is set to "5" or "6", the brush of the measurement panel II to the node B Between five 11Ω resistors and six 11Ω resistors in parallel, the maximum resistance after parallel connection is 30Ω, so contacts 5 and 6 are directly connected to the corresponding points on the resistance ring; other contacts of the measuring panel II are connected to node B to 30Ω; when the measurement panel II is set to "4" or "7", between the brush of the measurement panel II and the node B are four 11Ω resistors connected in parallel with seven 11Ω resistors, and the resistance after parallel connection is 28Ω, so 4 , 7 contacts are connected to the corresponding points on the resistance ring through a 2Ω resistor; when the measuring panel II is set to "3" or "8", there are three 11Ω resistors and eight 11Ω resistors between the brush of the measuring pan...

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Abstract

This invention relates to a potential meter with three measuring tray used for constant voltage measuring. The initiative input tray composed by measuring tray and assistant tray ; the second step input tray has measuring tray composed by 11X11 omega annular resistance net, and assistant tray composed by ten 0.5 omega resistance; the third tray is double slide wire tray, two measuring tray connect with measuring slide wire by wire, not use switch for switching, remove the impact of variation and thermoelectric force while potential meter measuring; the invention omits the substitution tray of first and second input trays.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for the potentiometer with three measuring discs, in the connection between the three measuring discs, the intermediate disc is generally switched by a switch, which will cause a change in 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; Patent No. ZL200520101772.0 has announced a new method for solving the variation of switch contact resistance with a potentiometer with three measuring discs. The first and second stepping discs are composed of a measuring disc, a substituting disc and an auxiliary disc. The resistance values ​​on the measuring disc and the substituting disc are the same. Every time a resistance is added to the measuring disc, the substituting disc will reduce the same resistance. , since t...

Claims

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Application Information

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IPC IPC(8): G01R17/20G01R19/00
Inventor 程军张春雷李顺定方勇
Owner 程军
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