Potential difference meter having four mensuring discs using conversion branch bimeasuring range conversion

A technology of potentiometer and range conversion, which is applied in the direction of AC/DC potential difference measuring devices, etc., and can solve the problems of increasing the size of the instrument

Inactive Publication Date: 2006-06-28
骆乃光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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. Comp

Method used

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  • Potential difference meter having four mensuring discs using conversion branch bimeasuring range conversion

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Example Embodiment

[0007] By "U x "The positive pole passes through each measuring plate, and then passes through the switch K 2 To "U x "The negative pole is the measurement loop, from the positive pole of the power supply through the measurement step switch to the set resistance RN and RP 3 , Then to the resistance R 0 , Adjustable resistance RP 2 And RP 1 Then, 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 set resistance RN and RP 3 , And then the negative electrode of the standard battery is the standard circuit. When all four disks throw "0", the resistance between the two brushes on the first stepping disk on the left is 220Ω, and the resistance on the right is equal to 2200Ω. The total resistance between the two brushes on the first stepping disk is 200Ω, so the first disk 10 / 11 of the total current between the two brushes flows on the left and 1 / 11 flows on the right. When the 10th point...

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Abstract

A two¿Crange conversion potential difference meter with four measuring discs and applying transposition branch is composed of four measuring discs as 20x 8 omega, 10x 0.88 omega, 9x 1.76 omega and 10x 0.176 omega as well as two ranges. It features that all measuring resistances are connected directly 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 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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