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Three measuring range direct current potential difference using conversion branch having four measuring disks

A technology of DC potentiometer and potentiometer, which is applied in the field of instruments for measuring DC voltage, and can solve the problems of larger instrument volume and the resolution of potentiometer as small as 0.1μv.

Inactive Publication Date: 2006-06-28
骆乃光
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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 volume of the instrument larger. Even so, the resolution of the potentiometer cannot be made as small as 0.1μv. In addition, 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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  • Three measuring range direct current potential difference using conversion branch having four measuring disks

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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 55Ω, the resistance on the right is equal to 550Ω, and the total resistance between the two brushes of the first step disc is 50Ω, 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 po...

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Abstract

A three ¿C range DC potential difference meter with four measuring discs and applying transposition branch is composed of four measuring discs as 20x 2 omega, 10x 0.22 omega, 9x 0.44 omega and 10x 0.044 omega. It features that all measuring resistances are directly connected by conducting wire to exclude contact resistance and variation from measuring ¿C stepping switch out of measuring result and integer power of one or two digit number multiplying by ten is used as value of resistance being used for range changeover.

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 makes the volume of the instrument larger. Even so, the resolution of the potentiometer cannot be made as small as 0.1μv. In addition, 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 disc...

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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