LABview-based method for measuring temperature-resistivity

Abstract

The invention belongs to the technical field of electrical measurement and relates to a LABview-based method for measuring temperature-resistivity. The method is characterized by utilizing a T-shaped thermocouple to acquire the temperature of the environment which the resistance material sample to be tested is in and utilizing a voltage value acquisition board to convert the analog signals of the voltage values to digital signals according to the formula and transmit the digital signals to an electronic computer; in the step of current change and output, transmitting the initial current value input into the computer when testing starts or the current value changed after voltage judgment to a current source via a program so that the current source outputs the transmitted current value; in the step of voltage acquisition and judgment, utilizing a digital multimeter to acquire the voltage values of the two ends of the resistance material sample to be tested; and utilizing Ohm's law R=U / I to obtain the resistance and then computing the resistivity according to the formula rho=R*S / L and automatically inputting the measured information and data into the computer and processing and storing the measured information and data. The method has the advantages of accuracy in measurement, intuitive data analysis, simplicity in operation, time conservation, intuitive result display and low cost.

Description

Technical field: [0001] The invention belongs to the technical field of electrical measurement, and relates to a method of measuring the resistivity trend of materials with temperature changes by using a constant current source, a digital multimeter, a thermocouple, a data acquisition board, a computer, and LABview software, and automatically saving the measurement data, which can be displayed. Its temperature-resistivity two-dimensional graph measurement system method can measure the resistivity change of materials under continuous or discontinuous temperature changes, especially a temperature-resistivity measurement method based on LABview. Background technique: [0002] With the rapid development and wide application of materials science, new materials are constantly emerging, and their related application research has also attracted the interest of many researchers. Most of the performance testing and use of a new material need to know its resistivity, and the resistivit...

AI Technical Summary

Problems solved by technology

Most of the existing temperature-resistivity measuring equipment can only measure one resistance value at a time and the data cannot be automatically saved. When the temperature changes, it is impossible to intuitively see how the resistance changes with the temperature. It is necessary to measure the temperature It is necessary to add a thermometer, and manual measurement records are required. It is often necessary to record the resistance value while recording the temperature, and after the measurement, it is necessary to perform data processing to convert the resistance value into resistivity, which takes a long time and has low accuracy. Some relatively advanced measuring instruments, such as PPMS, can measure automatically and have a wide range of temperature ranges, but the investment in these equipment and instruments is relatively large, and it is difficult for ordinary units and scientific research institutions to bear economically, and it is not easy to popularize and use them. The operation steps are complicated; so in conclusion, the existing temperature-resistivity measurement technology solutions generally have prominent shortcomings such as complex equipment used, cumbersome measurement steps, high measurement input costs, and poor measurement results and data accuracy.

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