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Two measuring ranges portable potentiometer

A potentiometer and portable technology, applied in the field of two-range portable potentiometers, 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: 2007-09-12
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 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 measuring ranges portable potentiometer

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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 ten 10Ω resistance rings connected end to end between contacts 1 to 9. When measuring panel II is set to "5", there are 5 10Ω resistors and 5 resistors between the brush of measuring panel II and node B. 10Ω resistors are connected in parallel, the maximum resistance after parallel connection is 25Ω, the resistance between the other contacts of 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 measuring panel II When “4” or “6” is set, four 10Ω resistors and six 10Ω resistors are connected in parallel between the brush of measuring panel II and node B, and the resistance after parallel connection is 24Ω, so contacts 4 and 6 pass through 1Ω resistors Connect with the corresponding point on the resistance ring; wh...

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Abstract

This invention relates to a two range potential meter with three measuring tray used for constant voltage measuring. The initiative input tray composed by measuring tray of 21X 10 omega and assistant tray A'and A'without resistance; the second step input tray has measuring tray composed by 10X10 omega annular resistance net, and assistant tray composed by ten 0.5 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 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 has announced 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R17/20G01R19/00
Inventor 程军张春雷李顺定方勇
Owner 程军
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