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Two-range potential difference meter with three measuring dish

A potentiometer and measuring disc technology, which is applied in the direction of changing range circuits, AC/DC potential difference measuring devices, etc., can solve the problems of increasing the number of layers, complex switch and instrument structures, and increasing the size of the instrument.

Inactive Publication Date: 2007-10-31
张春雷
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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 brush on the switch of the stepping disc is 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 disc switches is increased, thereby increasing the volume of the instrument and making the switch and instrument structure become complicated

Method used

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  • Two-range potential difference meter with three measuring dish

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Embodiment Construction

[0007] In the figure, the range changeover switch K 1-1 with switch K 1-2 is double pole double throw switch K 1 The left and right layers. Measuring panel II has nine 9Ω end-to-end resistance rings between contacts 1 and 8. When measuring panel II is set to "4" and "5", there are five 9Ω resistance rings between the brush of measuring panel II and node D The resistance is connected in parallel with four 9Ω resistors, and the maximum resistance after parallel connection is 20Ω. The resistance between the other contacts of the measuring panel II and the node D must be connected to 20Ω, and the "4" and "5" contacts correspond to the resistance ring. Points are directly connected; when the measuring panel II is set to "3" or "6", there are three 9Ω resistors and six 9Ω resistors connected in parallel between the brush of the measuring panel II and the node D, and the resistance after parallel connection is 18Ω, so 3. The 6 contacts are connected to the corresponding points on ...

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Abstract

This invention relates to one two-process level difference meter with three test panels for direct current voltage test, wherein its first feed panel is composed of 21X10Omega test panel and aid panel I', I' without resistance; the second feed panel forms measurement panel by 9X9Omega ring resistance and two 1Omega resistance forms aid panel by 10X0. 5Omega resistance; the third panel is of double slide panel and its two test panels and measurement slide lines are connected by wire not through switch free from impact of difference and thermal potential to get two process by 13Omega resistance with resolution rate as 1muV to save first and second switch panels.

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...

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Application Information

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IPC IPC(8): G01R17/20G01R15/08
Inventor 张春雷方李
Owner 张春雷
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