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Voltage measuring instrument with high resolution

A voltage measurement, high-resolution technology, applied in the direction of measurement device, measurement of electrical variables, measurement of current/voltage, etc., can solve the problems of complex structure of switches and instruments, increasing the number of layers, and increasing the volume of the instrument.

Inactive Publication Date: 2007-10-17
张春雷
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  • Abstract
  • Description
  • 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 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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  • Voltage measuring instrument with high resolution

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Embodiment Construction

[0007] In the figure, measuring panel II has nine 9Ω end-to-end resistance rings between contacts 1 to 8. When measuring panel II is set to "4" and "5", the distance between the brush of measuring panel II and node D is Five 9Ω resistors are connected in parallel with four 9Ω resistors. After parallel connection, the maximum resistance value is 20Ω. The resistance between other contacts of the measuring panel II and node D must be connected to 20Ω. Contacts "4" and "5" are connected to the resistor The corresponding points on the ring 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 node D, and the resistance after parallel connection is 18Ω, so contacts 3 and 6 are connected to corresponding points on the resistance ring through 2Ω resistors; when measuring panel II is set to "2" or "7", there are two 9Ω resistors between the brush of...

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Abstract

A high-resolution voltage measuring instrument for DC voltage measurement includes a first stepping panel composed of a measuring panel having 21x10 ohm and bracket panel I' and I'' without resistance, a second stepping panel comprising a measuring panel formed of a ring resistance of 9x9 ohm and two 1 ohm resistances meshwork, a bracket panel formed by a 10x0.5 ohm, a third stepping panel which is a dual-sliding panel. The two measuring panels and measuring sliding are connected by conductors without on-off switch, which is capable of non-existing variation and thermal potential effect when performing measurement by potential difference meter. The potential difference meter is provided with three extended ranges of x10, x1 and x0.1 with resolution of 0.1muV, and omitting the substitution panel of the first stepping panel and the second stepping panel.

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 Applications(China)
IPC IPC(8): G01R19/00
Inventor 张春雷方李
Owner 张春雷