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Tri-measuring range potential difference meter adapting transposition branch

A potentiometer and range technology, applied in the field of three-range potentiometers using transposition branches, can solve problems such as variation and thermoelectric potential effects

Inactive Publication Date: 2008-08-20
骆乃光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current portable potentiometer, due to the switch contact resistance and variation inside the potentiometer used to measure the two terminals, as well as the influence of thermoelectric potential, the resolution of the product cannot be 0.1μV.

Method used

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  • Tri-measuring range potential difference meter adapting transposition branch

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Embodiment Construction

[0010] In the figure, the resistance value of the left part between the replacement disc brush and the I measurement disc brush is 44Ω, and the resistance value of the right part is 440Ω, so the total resistance between the two brushes of the first disc is 40Ω. Connecting 60Ω in series, the resistance becomes 100Ω and enters the three-range conversion as a whole. In the ×10 range, the resistance in parallel with the measuring disc is 1000Ω. At this time, the total current flowing through the measuring disc is 5.5mA, and the current on the parallel 1000Ω resistor is 0.55mA. In the ×1 range, the parallel resistance with the measuring disc is 100Ω. The resistance connected in series with the measuring disk is 1000Ω, so the total current flowing through the measuring disk is 0.55mA. Similarly, in the ×0.1 range, the total current flowing through the measuring disk is 0.055mA. In this range, the resistance value is reduced. Therefore, the 81Ω resistor in series keeps the resistance...

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Abstract

The present invention relates to a three-range potential difference meter by adopting transposition branch circuit for making DC voltage measurement. It has three measuring discs, they are directly connected by means of conductor. Its minimum range time resolution can be up to 0.1 microvolt, at the same time its interior does not adopt standard cell, and adopts electronic reference source with micro power consumption.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] In the current portable potentiometer, due to the switch contact resistance and variation inside the potentiometer used to measure the two terminals, as well as the influence of thermal potential, the resolution of the product cannot be 0.1μV. Contents of the invention [0003] The purpose of the present invention is to design a portable potentiometer, which has three ranges and has a resolution of 0.1 μV when the limit is the smallest. It can eliminate the influence of contact resistance and variation between switches, and also exclude the influence of thermoelectric potential. [0004] The technical scheme of the present invention is such: the measuring part uses two stepping discs and a double-sliding wire disc, and the first stepping disc consists of the first measuring disc of 20 × 20 / 11Ω and the first measuring disc of 20 × 20 / 11Ω. The second steppin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R17/20
Inventor 骆乃光
Owner 骆乃光