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Portable three-measurement range potential difference meter

A potentiometer and range technology, applied in the field of three-range portable potentiometer, can solve the problems of increasing the number of layers, complicated switch and instrument structure, increasing the volume of the instrument, etc.

Inactive Publication Date: 2008-12-24
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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  • Portable three-measurement range potential difference meter

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Embodiment Construction

[0007] In the figure, measuring panel II has ten 10Ω end-to-end resistance rings between contacts 1 to 9. When measuring panel II is set to "5", there are five 10Ω resistors between the brush of measuring panel II and node B. Connect with five 10Ω resistors in parallel, the maximum resistance after parallel connection is 25Ω, the resistance between the other contacts of the measuring panel II and node B must be connected to 25Ω, and the "5" contact is directly connected to the corresponding point on the resistance ring; when When the measuring panel II is set to "4" or "6", there are four 10Ω resistors and six 10Ω resistors connected in parallel between the brush of the measuring panel II and node B, and the resistance value after parallel connection is 24Ω, so the 4 and 6 contacts The 1Ω resistor is connected to the corresponding point on the resistance ring; when the measuring panel II is set to "3" or "7", between the brush of the measuring panel II and the node B are three ...

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Abstract

A portable potential difference meter with three measurement range is prepared as forming the first stepping plate by 21x10omega measurement disc and auxiliary disc without resistance, forming the second stepping plate by using 10x10omegacircular resistance net to form measurement disc, forming auxiliary disc by 10x0.5omega resistances, setting the third plate to be double slide-wire disc and using wire to connect two measurement discs with measurement slide-wire.

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 Patents(China)
IPC IPC(8): G01R17/20G01R19/00
Inventor 张春雷程军李顺定方勇
Owner 张春雷
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