Rotary decimal fine-tuning resistance box

A kind of fine-tuning resistance, rotary technology, applied in the direction of resistance elements including multiple resistance elements, can solve the problems of the bridge can not adjust the balance, the display value is discontinuous, will jump, etc., to achieve the effect of improving the measurement accuracy

Active Publication Date: 2016-06-22
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the resolution (that is, the number of digits) is insufficient, the balance of the bridge cannot be adjusted w...

Method used

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  • Rotary decimal fine-tuning resistance box
  • Rotary decimal fine-tuning resistance box

Examples

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Embodiment 1

[0016] a kind of like figure 1 The rotary decade fine-tuning resistance box shown (hereinafter referred to as the fine-tuning resistance box) includes multiple resistance plates and a fine-tuning resistance plate. The fine-tuning resistance plate includes dynamic and static contact switches K4, standard resistance R S 2, 10 auxiliary resistors R with different resistance N 3. It can be a brand-new product or an improvement to the existing resistance box. The following is an example of the improvement of the standard resistance box ZX25a. The main technical indicators of ZX25a are: it is composed of 6 decimal rotary resistance discs 1 in series, continuously adjustable, the adjustment range is (0.01~1111.11)Ω, the highest accuracy is 2 / 10,000; the accuracy of 2 digits after the decimal point is the error 1% and 5% respectively. The output of the resistance value is connected by the complex moving and static contacts of the rotary switch K, and the contact resistance r will b...

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PUM

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Abstract

The invention discloses a rotary decimal fine-tuning resistance box, which comprises a plurality of resistance trays and a trimming resistance tray, wherein the trimming resistance tray comprises a standard resistor RS, 10 auxiliary resistors RN with different resistance values, a moving contact and a fixed contact K, wherein the standard resistor RS is fixedly welded at an input end and an output end of a tray circuit; 10 auxiliary resistors RN are connected with the moving contact and the fixed contact K in series respectively and then connected with the standard resistor RS in parallel for output; indicating values of the auxiliary resistors RN are 0-10; and output values of the auxiliary resistors are 10, 11, ... ... 19 and 20. The rotary decimal fine-tuning resistance box can improve one or more accuracy grades; the digits, behind a decimal point, of the output value of the resistance box can be increased; the tenfold resolution is improved after increasing one digit; improvement can be carried out by an existing standard resistance box; additional capital investment is not needed; and the accuracy and the resolution of the whole standard resistance box are greatly improved.

Description

technical field [0001] The invention relates to a fine-tuning resistance box, in particular to a rotary decimal fine-tuning resistance box suitable for a measurement verification electric bridge or a digital thermometer. Background technique [0002] Usually, the output resistance value of each plate of the rotary decade resistance box is composed of a group of series resistance and resistance selection moving and static contacts. The larger the series resistance, the more negligible the contact resistance r of its moving and static contacts, and vice versa. The rotary decade standard resistance box (hereinafter referred to as the resistance box) is composed of a plurality of resistance plates connected in series, and can be used as a standard for a bridge or a digital thermometer. However, due to the contact resistance of the moving and static contacts in the resistance box, the accuracy of the resistance plate with digits below the decimal point in the resistance box is n...

Claims

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Application Information

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IPC IPC(8): H01C10/16
CPCH01C10/16
Inventor 杨泽南郭志斌许素芳吴永慧陆胜华
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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