Device for automatically testing aging performance and thermal time constant of thermistor
An automatic test device, a technology of thermal time constant, applied in the direction of material impedance, etc., can solve the problems of inaccurate measurement data, unadjustable temperature, uneven temperature field, etc., to achieve the effect of accurate temperature environment, improve efficiency, and avoid water vapor
Active Publication Date: 2013-02-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0003] The purpose of the present invention is to provide a multi-channel thermistor aging and thermal time constant testing device, which solves the problems of uneven temperature field, non-adjustable temperature, inaccurate measurement data and low efficiency existing in existing testing equipment, and is suitable for Real-time monitoring test and sampling test for a large number of thermistors
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[0016] Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0017] like figure 1 As shown, the present invention includes a high-temperature water tank mechanism, a low-temperature water tank mechanism, a sample position switching mechanism, an automatic water supply unit, and a measurement and control unit.
[0018] The high-temperature water tank mechanism and the low-temperature water tank mechanism are composed of a temperature control box 1, a water tank 2, and a stirring motor 3.
[0019] The automatic water supply unit is composed of a liquid level relay 4 and a solenoid valve 5 .
[0020] The sample position switching mechanism is composed of a telescopic cylinder 7 , a swing cylinder 8 , a sample support platform 9 , and a lead wire guide rod 10 .
[0021] The measurement and control unit 6 is placed at the upper left position of the entire testing device.
[0022] like figure 2 As shown, the inte...
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The invention discloses a device for automatically testing the aging performance and a thermal time constant of a thermistor. The device comprises a high temperature water tank mechanism, a low temperature water tank mechanism, a sample position switchover mechanism, an automatic water feed unit and a measurement and control unit, wherein the sample position switchover mechanism is arranged between the two water tank mechanisms which are connected with the automatic water feed unit respectively; and the measurement and control unit is electrically connected with the sample. By the device, a test environment with constant temperature can be guaranteed, and automatic water level feed and sample position switchover are realized, so that data can be digitalized and full-automatic test on the aging performance and the thermal time constant of the thermistor can be realized; furthermore, the problems of non-uniform temperature field, nonadjustable temperature, inaccurate measured data and low efficiency of the conventional test equipment can be solved; and the device is applicable to real-time monitoring test or sampling test on a large quantity of produced thermistors.
Description
technical field [0001] The invention belongs to the field of current and voltage testing, in particular to an automatic testing device for multi-channel thermistor aging and thermal time constant. Background technique [0002] The thermistor has the characteristics of wide range of resistance value variation, high temperature measurement accuracy, and high reliability. It is widely used in temperature measurement, temperature compensation and surge suppression. The test of thermistor parameters is of great significance to improving the production process of thermistor components, increasing production efficiency, and ensuring production quality. At present, when testing the thermistor aging and thermal time constant, especially the negative temperature coefficient thermistor NTC, the factory uses boiling water and manual testing. The test method uses uneven temperature field and non-adjustable temperature. The test data Inaccurate, many links require manual intervention, th...
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IPC IPC(8): G01N27/02
Inventor 黎步银刘明胡宾鑫戴世龙黄龙
Owner HUAZHONG UNIV OF SCI & TECH