Method for measuring normal temperature resistivity and resistance temperature coefficient of conductor at variable temperature

Abstract

The invention relates to a method for measuring the normal temperature resistivity and the resistance temperature coefficient of a conductor at variable temperature. The method is characterized by installing a two-point electronic temperature measurement probe on a standard bridge test stand, introducing a microhmmeter measuring signal and an electronic temperature measurement probe signal into a computer acquisition card, simultaneously and continuously recording resistance values and temperature changes by using a computer, changing the room temperature by using an indoor air-conditioning device, computing the resistivity by using the recorded resistance values at different temperature and the cross section area measured by a density method, obtaining the variable linear slope K of a resistor R relative to temperature T according to a fitting curve, and computing the slope K by using a resistivity temperature variation coefficient [alpha]. The method uses a universal measuring bridge with the electronic temperature probe and the air conditioner temperature change so as to solve a puzzle in common laboratory conductor resistivity and temperature coefficient measurement, and is simple in measurement procedures and high in efficiency compared with a standard measuring method.

Description

technical field [0001] The invention relates to a method for measuring the normal temperature resistivity and the resistance temperature coefficient of a conductor under variable temperature. Background technique [0002] The resistivity of a conductor is usually measured by the bridge method, and the standard room temperature resistivity is the resistivity at 20°C. The standard measurement method needs to be carried out in a constant temperature bath in a constant temperature room, which is not suitable for ordinary laboratory measurement. Usually, the resistance at a certain temperature is measured in an ordinary laboratory, and then converted with the temperature coefficient of resistivity introduced in the data to obtain the resistance at 20°C. In fact, the chemical composition of the conductor is not exactly the same, the heat treatment state is not exactly the same, and the temperature coefficient of resistivity is also different. It is not correct to use a single te...

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Problems solved by technology

It is not correct to use a single temperature coefficient of resistivity to convert

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