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Three-range potentiometer having four measurement disks and employing shunt branch

A technology of potentiometer and shunt branch, which is applied in the direction of AC/DC potential difference measurement devices, etc., and can solve the problems of potentiometer resolution as small as 0.1μv and instrument volume becoming larger

Inactive Publication Date: 2006-07-26
骆乃光
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  • 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 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-range potentiometer having four measurement disks and employing shunt branch

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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 297Ω, the resistance on the right is equal to 2970Ω, and the total resistance between the two brushes of the first step disc is 270Ω, 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

The invention provides a potentiometer with four measuring discs and diverting branch three range switching for voltage measurement, which is equipped with three measuring ranges, and comprises four measuring discs of 20X10 Omega, 10X1.1 Omega, 9X2.2 Omega, 10X0.22 Omega, all the measuring resistors are connected with wires, the invention can eliminate the contact resistance and variation difference of the step switch from the measurement result, thus good repeatability can be achieved even the minimum resolution is 0.1 uV, according to the invention, the resistance for range switching is the arithmetic product of a uni-digit or bi-digit and the integral power of 10.

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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