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Two measuring ranges potentiometer

A potentiometer and range technology, applied in the field of two-range potentiometers, can solve the problems of complex structure of switches and instruments, increase the number of layers, and increase the volume of the instrument, and achieve the effects of simple structure, reduced volume and reduced production costs.

Inactive Publication Date: 2007-09-12
李顺定
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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 welded with resistance is increased, thereby increasing the volume of the instrument and making the switch and the instrument structure becomes complex

Method used

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  • Two measuring ranges potentiometer

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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 connected in parallel, the maximum resistance after parallel connection is 30Ω, the resistance value between the other contacts of the measuring panel II and the node B is connected to 30Ω, the 5, 6 contacts and the resistors The corresponding points on the ring are directly connected; when the measuring panel II is set to "4" or "7", between the brush of the measuring 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 contacts 4 and 7 are connected to corresponding points on the resistance ring through 2Ω resistors; when measuring panel II is set to "3" or "8", there are three 11Ω resistors between the brush of mea...

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Abstract

This invention relates to a two range potential meter with three measuring tray used for constant voltage measuring. The initiative input tray of this invention is 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 distinguish ability can reach 1 mu V; 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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Patent Type & Authority Applications(China)
IPC IPC(8): G01R17/20G01R19/00
Inventor 李顺定张春雷程军方勇
Owner 李顺定
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