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Four measuring ranges potentiometer

A potentiometer and range technology, applied in the field of four-range potentiometer, can solve the problems of increasing the volume of the instrument, increasing the number of layers, switching and complex structure of the instrument, etc.

Inactive Publication Date: 2010-05-26
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 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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Embodiment Construction

[0007] In the figure, the measurement panel II is eleven 110Ω 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 110Ω resistors and six 110Ω resistors in parallel, the maximum resistance after parallel connection is 300Ω, the resistance value between the other contacts of the measuring panel II and node B is connected to 300Ω, the 5, 6 contacts and the resistors Corresponding points on the ring are directly connected; when the measurement panel II is set to "4" or "7", there are four 110Ω resistors connected in parallel with seven 110Ω resistors between the brush of the measurement panel II and node B, and the resistance after parallel connection is 280Ω, so the contacts 4 and 7 are connected to the corresponding points on the resistance ring through the 20Ω resistor; when the measuring panel II is set to "3" or "8", there are three 110Ω resistors between the...

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Abstract

This invention relates to a four range 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 10X110 omega annular resistance net, and assistant tray composed by ten 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 0.1 mu V; this 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 discloses 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 the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R17/20G01R19/00
Inventor 程军
Owner 程军
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