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Method for measuring current dependence of direct-current standard resistors by utilizing multiplied current

A standard resistance and current measurement technology, applied in the field of current doubling method, can solve the problem of high cost and achieve the effect of low requirements, easy implementation and reduced contribution

Inactive Publication Date: 2012-09-19
NAT INST OF METROLOGY CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are also limitations, such as the use of two sets of the highest electrical quantum benchmarks, and a specially developed set of 1A CCC, which is expensive

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  • Method for measuring current dependence of direct-current standard resistors by utilizing multiplied current
  • Method for measuring current dependence of direct-current standard resistors by utilizing multiplied current
  • Method for measuring current dependence of direct-current standard resistors by utilizing multiplied current

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0021] For the convenience of description, the Figure 1a Magnetic modulator in DCC ( Figure 1a inside the dotted line) is simplified to Figure 1b The current controlled current source in I s , I s = W x W s I x = n I x .

[0022] The present invention utilizes the method for measuring the current dependence of a DC standard resistor by multiplying the current——the circuit principle of the current multiplying method is as follows: figure 2 As shown, the circuit includes three DC resistors and two DCCs. DCC1 is a DC current comparator bridge for conventional resistance measurement, and DCC2 is a DC current comparator range...

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Abstract

The invention provides an absolute measurement method for measuring the current dependence of direct-current standard resistors by utilizing multiplied current, which belongs to the field of direct-current resistor measurement. The method adopts an equivalent resistor as a reference resistor, two four-terminal standard resistors with the same nominal value are connected in series to form the equivalent resistor, the reference resistor and a measured resistor are connected with a direct current comparator bridge, a direct current comparator range expander is then connected, and thereby a testing circuit is formed; the direct current comparator range expander is used for multiplying the current flowing through the measured resistor while keeping the current in the reference resistor unchanged; and by measuring the resistance change of the measured resistor caused by the multiplied current, the method can realize the absolute measurement of the current dependence of the measured resistor. The method can be utilized to carry out the absolute measurement of the current or power dependence of standard resistors, and the uncertainty of measurement does not depend on the measuring accuracy of the DCC resistor bridge as well as the power variation of the reference resistor.

Description

technical field [0001] The invention belongs to the field of direct current resistance measurement, and in particular relates to a method for measuring the current dependence of a direct current standard resistor by using multiplied current—the double current method. Background technique [0002] In actual measurement, DC resistors may work at different currents. Current dependence (current variation or power variation or load factor) is an important indicator of DC resistors. The current dependence of the resistance is defined as the resistance value R(I) of the DC resistor under the working current I to the reference current I 0 Lower resistance value R(I 0 ), as shown in (1). [0003] R ( I ) - R ( I 0 ) R ...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 邵海明梁波张钟华林飞鹏李艳强贾凯李之彬
Owner NAT INST OF METROLOGY CHINA
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