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Direct current potential difference method of three measuring range conversion

A technology of DC potentiometer and range conversion, which is applied in the direction of AC/DC potential difference measurement devices, etc., and can solve problems such as variation and thermoelectric potential influence

Inactive Publication Date: 2006-06-07
骆乃光
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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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  • Direct current potential difference method of three measuring range conversion

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Embodiment Construction

[0010] In the figure, when the three measuring discs throw "-1", the resistance value of the left part between the I' replacement disc brush and the I measuring disc brush is 40Ω+10.6Ω+4.4Ω=55Ω, and the right part The resistance value is 40Ω+4.4Ω+505.6Ω=550Ω, so the total resistance between the two brushes of the first plate is 50Ω. Since the resistance value of the measuring plate is increased by one, the resistance value is reduced by the same value when changing the plate, so the measuring plate throws other values The resistance value remains unchanged. In the ×10 range, the resistance in parallel with the measuring disc is 500Ω. At this time, the total current flowing through the measuring disc is 2.75mA, and the current on the parallel 500Ω resistor is 0.275mA. In the ×1 range, the resistance in parallel with the measuring disc is 50Ω. The resistance connected in series with the measuring disk is 500Ω, so the total current flowing through the measuring disk is 0.275mA. S...

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Abstract

The DC potentiometer for DC voltage measurement has three measurement ranges of X10, X1 and X0.1 separately. It has 11x40 / 11 ohm potentiometer in the first measuring disc, 11x0.4 ohm potentiometer in the second measuring disc and 0-4.4 ohm potentiometer in the third measuring disc, and the three measuring discs are connected with wires without contact resistance and variation. The zero potential the lead resistance generates is compensated with the negative potential. The X10 range has upper measuring limit of 111 mV, the X0.1 range has resolution of 0.1 mu V, and the potentiometer has high measurement repeatability.

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 contact resistance and variation effects between switches, and also excludes the influence of thermoelectric potential; In order to facilitate "self-test", the three measuring discs are all set with "-1" indication value. [0004] The technical scheme of the present invention is as follows: the working current adjustment resistor RP 1 and RP 2 , a fixed resistor R for a fixed supply voltage drop 0 , ...

Claims

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Application Information

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