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Laboratory type potential difference meter

A potentiometer and laboratory technology, which is applied in the direction of AC/DC potential difference measuring devices, etc., and can solve the problems such as the increase in the volume of the instrument

Inactive Publication Date: 2009-02-04
骆乃光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the currently produced potentiometer, when there are more than three measuring discs, there will be switch contact resistance and variation between the two measuring terminals. Therefore, even if the working current is as small as 0.1mA, the brushes and contacts of the switch are not only made of silver copper. Composite materials, the contact area is also made quite large, to reduce the impact of the variation of the measurement switch when switching step by step, which makes the instrument volume larger, and there is also the influence of the thermoelectric potential of the switch and the variable thermoelectric potential of the contact

Method used

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  • Laboratory type potential difference meter

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Embodiment Construction

[0007] In the figure, represented by "U X "The positive electrode passes through each measuring disc, and then passes through the switch K 2 to "U X "The negative pole is the measurement circuit, from the positive pole of the power supply through the measurement step switch to the setting resistance RN and the temperature compensation plate RP 4 , then to resistor R 0 , adjustable resistance RP 3 , adjustable resistance RP 2 , adjustable resistance RP 1 After that, back to the negative pole of the power supply is the working circuit; from the positive pole of the standard battery EN through the switch K 2 , to the setting resistance RN and the temperature compensation plate RP 4 , and then to the negative pole of the standard battery is the standard circuit. When the five step discs are all set to "0", the left resistance between the two brushes of the first step disc is equal to 297Ω, and the resistance on the right is equal to 2970Ω. The total resistance between the t...

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Abstract

A potential difference meter of laboratory type is prepared as using 20 x 10 omega as the first measuring disc, 9x 2.2 omega as the second and the third measuring discs, 10x 0.022 omega as the fourth and fifth measuring discs; using conductive wire to connect resistances on all measuring discs between two measuring end buttons to exclude influence of contact resistance variation and thermo voltage from measuring switch on measuring result.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] For the currently produced potentiometer, when there are more than three measuring discs, there will be switch contact resistance and variation between the two measuring terminals. Therefore, even if the working current is as small as 0.1mA, the brushes and contacts of the switch are not only made of silver copper. Composite materials, the contact area is also made quite large, to reduce the impact of the variation of the measurement switch when switching step by step, which increases the volume of the instrument, and there is also the influence of the thermoelectric potential of the switch and the variable thermoelectric potential of the contact. Contents of the invention [0003] The problem to be solved by the present invention is that when there are five step switches used in the measuring part in the potentiometer, the contact resistance and variation ...

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