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Direct current potentiometer having five scale readings

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 increasing the size of the instrument

Inactive Publication Date: 2007-07-04
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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Embodiment Construction

[0007] by "U x "The positive pole passes through each measuring disc, and then passes through the switch K 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, to the setting resistance 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 resistance on the left between the two brushes of the first step disc is 185.768Ω, and the resistance on the right is equal to 1857.68Ω, so 10 / 11 of the total current between the two brushes of the first disc is on the left flow, 1 / 11 flows on the right. When the second plate throws 0 points, the resistance of the parallel part of the secon...

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Abstract

The invention provides a DC potentiometer with five-digit reading for DC voltage measurement, and comprises three measuring discs of 20X8 Omega, 9X1.76 Omega, 10X0.176 Omega and a 0-0.968 Omega slide discs for providing five-digit reading system, all the resistors for measurement are connected directly with wires, thereby eliminating the contact resistance and variation difference of the step switch from the measurement 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 the measuring part in the potentiometer has three step discs and one sliding wire disc, the contact resistance and ...

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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