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Voltage measuring instrument with multiple range and high resolution

A voltage measurement, high-resolution technology, applied in the direction of changing range circuits, measuring current/voltage, instruments, etc., can solve the problems of increasing the size of the instrument, complex switch and instrument structures, and increasing the number of layers.

Inactive Publication Date: 2007-10-17
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 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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  • Voltage measuring instrument with multiple range and high resolution

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Embodiment Construction

[0007]In the figure, measuring panel II has nine 90Ω end-to-end resistance rings between contacts 1 and 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 90Ω resistors are connected in parallel with four 90Ω resistors. After parallel connection, the maximum resistance value is 200Ω. The resistance between other contacts of the measuring panel II and node D must be connected to 200Ω. 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 90Ω resistors connected in parallel with six 90Ω resistors between the brush of the measuring panel II and node D, and the resistance after parallel connection is 180Ω, so contacts 3 and 6 are connected to corresponding points on the resistance ring through 20Ω resistors; when measuring panel II is set to "2" or "7", there are two 90Ω resistors between t...

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Abstract

A multi-range high resolution voltage measuring instrument for DC voltage measurement includes a first stepping panel composed of a measuring panel having 21x100 ohm and bracket panel I' and I'' without resistance, a second stepping panel comprising a measuring panel formed of a ring resistance of 9x90 ohm and two 10 ohm resistances meshwork, a bracket panel formed by a 10x5 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 measuring by voltage measuring instrument using a resistance of 13ohm for shunt current, thereby obtaining three extended ranges of x1, x0.1 and x0.01 with resolution of 0.1muV, and omitting 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 deterioration of switch contact resistance by 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/08
Inventor 张春雷方李
Owner 张春雷
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