Resistor testing apparatus

Abstract

The invention discloses a resistor testing apparatus. The apparatus comprises a four-point resistor testing device, a resistance meter, a thermometer, a tubular furnace, a gas cylinder, an air exhauster, an air inlet flange and an air exhaust flange, wherein the four-point resistor testing device comprises a resistance testing probe assembly and a sample bench assembly which are movably connected through a tubular clamp; the resistance testing probe assembly is provided with resistance testing probes; the sample bench assembly is provided with a sample bench and a temperature measuring probe; and the resistance testing probes abut tight against the upper surface of the sample bench under effects of the bite force of the tubular clamp. The use of the four-point resistor testing device improves the accuracy of the resistor testing apparatus provided by the invention, at the same time, during measurement of a sample to tested, on one hand, the sample to be detected is not polluted, and on the other hand, the problem of incapability of accurate control of the positions of the four probes due to silver slurry pasting in a conventional testing method can be solved. Besides, the measuring temperature is not restricted by an oxidation temperature of silver slurry anymore, and theoretically, the testing temperature can reach the melting point of a platinum wire, i.e., 1680 DEG.

Description

technical field [0001] The invention belongs to the technical field of material testing, and in particular relates to a resistance testing device. Background technique [0002] It is a difficult point to accurately, conveniently, quickly and intelligently test the resistance value of materials that change with temperature changes in a large temperature range. The difficulty lies in: [0003] 1) To accurately test the resistance of the material, it is best to use the standard four-probe form. The material used for the four-probe at high temperature is very demanding, and it is resistant to high temperature and oxidation; [0004] 2) The test must be carried out in a corundum tube in a tube furnace with an inner diameter of only about 35mm, and the space is narrow, which makes it difficult to design and manufacture the test device; [0005] 3) The temperature instrument of the tube furnace itself cannot accurately reflect the temperature of the sample, and a temperature measu...

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Problems solved by technology

[0004] 2) The test must be carried out in a corundum tube in a tube furnace with an inner diameter of only about 35mm, and the space is narrow, which makes it difficult to design and manufacture the test device;

[0005] 3) The temperature instrument of the tube furnace itself cannot accurately reflect the temperature of the sample, and a temperature measuring device that can accurately reflect the temperature of the sample must be provided

The disadvantage of this method is that: on the one hand, the conductive silver paste is easy to oxidize at high temperature, resulting in poor contact between the probe and the sample and some interface problems, and the silver paste is easy to diffuse with the sample under high temperature conditions, pollute the sample, and cannot be tested again ; On the other hand, the method of silver paste welding determines that the distance between the four probes cannot be accurately controlled, and each sample must be welded, the measurement error increases and the test is complicated. Therefore, this method tests the effect at high temperature Not so good

[0007] In the current test method, a thermocouple is usually placed next to the sample to be tested to measure the test temperature, or the temperature value of the tube furnace is directly recorded as the temperature value of the sample to be tested. These methods cannot achieve Accurate measurement of the temperature of the sample to be tested

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