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Two-measuring range DC potential difference meter

The technology of a DC potentiometer and a potentiometer is applied in the field of instruments for measuring DC voltage, and can solve the problems of increasing the size of the instrument and the like

Inactive Publication Date: 2006-08-16
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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  • Two-measuring range DC potential difference meter

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Embodiment Construction

[0007] 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 RP 3 , then to resistor R 0 , adjustable resistor RP 2 and RP 1 Finally, 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 resistor RN and RP 3 , and then to the negative pole of the standard battery is the standard circuit. When all four discs throw "0", the left resistance between the two brushes of the first step disc is 198Ω, the resistance on the right is equal to 1980Ω, and the total resistance between the two brushes of the first step disc is 180Ω, so the first disc 10 / 11 of the total current between the two brushes flows on the left and 1 / 11 on the right. When throwing the 10th...

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Abstract

A two-range DC potential difference meter is composed of two ranges and four measuring plates of 20*8 omega, 10*0.88 omega, 9*1.76omega.and 10*0.176 omega .It features that all measuring resistances are directly connected by wires to exclude variation and contact resistance of measuring-stepping switch from measuring result and range conversion resistance value is integer power of one digit being multiplied by ten.

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 four step discs in the potentiometer, the contact resistance and variation of the step switching of the m...

Claims

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Application Information

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IPC IPC(8): G01R17/20
Inventor 骆乃光
Owner 骆乃光
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