Low-temperature resistance temperature coefficient tester

A technology of temperature coefficient of resistance and temperature measurement, applied in the direction of material resistance, etc., can solve the problem of inability to measure different constant temperature media

Inactive Publication Date: 2007-08-22
SINO PLATINUM METALS CO LTD
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  • Abstract
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Problems solved by technology

The invention can overcome the disadvantages of using different constant temperature media in different temperature ranges and being unable to measure in a lower temperature range (such as below -100°C)

Method used

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  • Low-temperature resistance temperature coefficient tester

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Embodiment Construction

[0011] Put a certain amount of liquid nitrogen in the Dewar bottle, put the stainless steel cylinder (3) into the Dewar bottle (1), and install the heat insulating ring (8); the alloy wire material of the resistance to be measured is welded on the sample by the four-terminal method On the frame (14), the sample holder (14), PT thermal resistance (17), copper-constantan thermocouple (13) (PT thermal resistance can also be used) are inserted in the quartz tube, and the gland (10) is tightened. The PT thermal resistance (17) cooperates with the SWP-N intelligent digital instrument to control the temperature in the quartz tube to a specific temperature, connect the power supply of the SWP-N intelligent digital instrument, set the measurement temperature on the SWP-N intelligent digital instrument, and use copper-constantan Thermocouple (13) (PT thermal resistance can also be used) to measure the actual temperature in the quartz tube (5), and after the actual temperature is stabiliz...

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Abstract

The invention relates to a device to test temperature coefficient of metal and alloy low-temperature resistance, especially a device to test metal and alloy resistance continuously in -196deg.C-+200deg.C. The device is composed of three parts including thermostatic part, temperature measurement and control and resistance measurement. Thermostatic part contains cold source (I), heater (II), sealing element (III), thermostatic chamber (III) and insulation course (IV) etc. temperature measurement and control contains platinum hot resistance, copper-constantan thermojunction (or platinum hot resistance) and SWP-N intelligent digital apparatus. Resistance measurement adopts double bridge and potentiometer method. The invention can realize measurement of metal and alloy resistance at any temperature in -196 deg.C-+200deg.C by using the same thermostatic container.

Description

technical field [0001] The invention relates to a device for testing the temperature coefficient of resistance of metals and alloys, in particular to a test device for continuously testing the temperature coefficient of resistance in the temperature range of -196°C to +200°C. technical background [0002] Precision resistance alloys refer to precision alloys with a very low temperature coefficient of resistance within a certain temperature range. They are widely used in the instrumentation industry to make precision resistance elements. Therefore, the temperature coefficient of resistance is a key indicator of precision resistance alloys and must be measured accurately . The measurement temperature range is generally -60℃~+150℃. The test system is generally composed of three parts: constant temperature bath, temperature measurement and resistance measurement. Different constant temperature media are used in different temperature ranges: -60℃~0℃, alcohol is used as Medium, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/14
Inventor 万吉高刘雄黄炳醒雷春明张瑞华武海军
Owner SINO PLATINUM METALS CO LTD
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