Four-terminal resistor and method for measuring time constant of four-terminal resistor

A four-terminal resistance and time constant technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, resistors, etc., can solve problems such as large uncertainty, achieve precise measurement, improve high-frequency characteristics, and reliable technology Guaranteed effect

Inactive Publication Date: 2014-07-09
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the uncertainty of this method correction will be very large

Method used

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  • Four-terminal resistor and method for measuring time constant of four-terminal resistor
  • Four-terminal resistor and method for measuring time constant of four-terminal resistor
  • Four-terminal resistor and method for measuring time constant of four-terminal resistor

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0040]The invention proposes a new design idea of ​​the standard structure of the four-terminal resistance time constant, and at the same time innovates on the fixed value of the time constant.

[0041] Such as figure 1 As shown, the present invention has designed a four-terminal resistance R of a coaxial pull wire structure K . First, on the premise of easy welding and processing, the number and geometric dimensions of the resistance wires are determined according to the rated current passed by the cross-sectional area of ​​the resistance material. current disk) and the bracket for the distance between the current collecting disk 4 (also known as the collecting current disk), the central rod 6 adopts a copper rod with a symmetrical cross section (such as a circular copper rod in cross section) , the central rod 6 of this embodiment adopts a copper bracket; then th...

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Abstract

The invention provides a four-terminal resistor and a method for measuring the time constant of the four-terminal resistor, belonging to the field of resistance measurement standards. The four-terminal resistor adopts a coaxial bracing wire structure and comprises an outer shell (3), a resistance wire (7), a central rod (6), a shunt disc (5) and an afflux disc (4), wherein the resistance wire (7), the central rod (6), the shunt disc (5) and the afflux disc (4) are installed in the outer shell (3). According to the method, the resistance wire with a low resistivity is adopted to replace the resistance wire with a high resistivity in the four-terminal resistor to form a four-terminal resistor RC with the low resistivity; the four-terminal resistor RC with the low resistivity and a four-terminal mutual inductor M are mutually replaced to realize measurement to the inductance value L of the four-terminal resistor; and the capacitance value C of the four-terminal resistor is obtained through measuring the capacitance of the four-terminal resistor RC with the low resistivity in which a current loop is disconnected. According to the four-terminal resistor and the method, the traceability problem of angle difference measurement of the four-terminal resistor in the alternating-current electric quantity measurement process is solved.

Description

technical field [0001] The invention belongs to the field of resistance measurement standards, in particular to a four-terminal resistance and a method for measuring the time constant of the four-terminal resistance. Background technique [0002] When passing through alternating current, when the frequency is not very high, the equivalent circuit of the resistor can be expressed by a circuit with concentrated parameters, that is, the AC resistance can be equivalent to its DC resistance in series with a residual inductance and parallel with a distributed capacitance. The physical explanation is that when the AC current flows through the resistor, the AC voltage will produce a phase shift. The angle of this phase shift is the product of the angular frequency and the time constant. The higher the frequency, the larger the time constant, and the greater the phase shift. . From the time domain, if the alternating current is a pulse current, then the time constant is the time req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02H01C3/00
Inventor 张江涛潘仙林谷扬王彪刘文芳马雪锋黄洪涛张德实
Owner NAT INST OF METROLOGY CHINA
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