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Two-range potential difference meter

A potentiometer and range technology, which is applied in the field of two-range potentiometers, can solve the problems of increasing the number of layers, complicated switch and instrument structures, and increasing the size of the instrument, and achieves the effect of reducing the volume, simple structure, and reducing production costs.

Inactive Publication Date: 2015-04-29
XIAN QUNFENG ELECTRONICS INFORMATION TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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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-range potential difference meter

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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

The invention discloses a two-range potential difference meter with three measuring dials for measuring direct voltage. A first stepping dial comprises a measuring dial and an auxiliary dial; a second stepping dial comprises a measuring dial formed by a 11*11 ohm annular resistor net, and an auxiliary dial formed by ten 0.5 ohm resistors; a third dial is a double-slide wire dial, wherein the two measuring dials are connected with the measuring slide wires through leads, instead of switching by a switch, so that the variation and the thermoelectric potential influence can be avoided when the potential difference meter is used for measuring, and the resolution ratio can be up to 1 <mu>V; furthermore, the replacing dials for the first stepping dial and the second stepping dial can be avoided.

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, a large electric steel is generally used to increase the contact area, and a silver-copper composite material is 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. ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R17/20
Inventor 不公告发明人
Owner XIAN QUNFENG ELECTRONICS INFORMATION TECH
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