Auxiliary Tooling for Screening and Testing of Thermistor Chips with Surface Electrodes

Abstract

The invention discloses an auxiliary tooling for screening and testing thermistor chips with surface electrodes, which is used for screening and testing the thermistor chips with surface electrodes. The direction is a vertical metal column, and the insulating cover plate is provided with a plurality of cover plate through holes, the cover plate through holes include a first through hole and a second through hole, and a plurality of cover plate through holes correspond to a plurality of metal columns one by one , the insulating cover plate and the common electrode plate are vertically overlapped and connected, and the metal post is placed in the second through hole and is close to the common electrode plate. In the present invention, by adding a metal post and an insulating base for limiting the position of the metal post, the thermistor chip is placed between one end of the metal post and the common electrode plate during testing, and the tip of the test pen touches the metal post without contacting the surface of the resistance chip. It will scratch the surface of the resistance chip, effectively protect the resistance chip, and the resistance chip will not be displaced with the movement of the test pen, and the resistance value test has good repeatability.

Description

technical field [0001] The invention relates to an auxiliary tooling for electronic testing, in particular to an auxiliary tooling for screening and testing a thermistor chip with surface electrodes. Background technique [0002] The core component of the thermistor is the thermistor chip. The main performance index of the thermistor chip is the resistance value-temperature correspondence of the product. At the same time, the stability under different test conditions needs to be assessed. The zero-power resistor at the specified temperature is used Value change rate and appearance integrity characterization, the above requirements require the screening test of the thermistor chip under different environmental conditions and the test before and after the test. The screening test is to effectively eliminate early failure products of the product. [0003] A thermistor chip with surface electrodes refers to a thermistor chip with two electrodes located on both sides of the resis...

AI Technical Summary

Problems solved by technology

[0007] 1. The tip of the test pen directly touches the surface of the resistor chip. Since the gold or silver of the thermistor chip is soft metal, its surface is easily scratched by the tip of the test pen, and it is also easy to cause defects in the corners of the resistor chip, thereby damaging the resistor chip or lowering the temperature. Resistance chip performance;

[0008] 2. The tip of the test pen directly touches the surface of the resistance chip, which will cause the displacement of the resistance chip with the movement of the test pen, resulting in confusion in the product sequence and poor repeatability of the resistance value test, which is not conducive to the implementation of automatic data collection in the later stage and affects the test accuracy. At the same time, it has high requirements for the skills of the operators, that is, the requirements for the strength of the operators are relatively high;

[0010] 4. Since the resistance chip is close to the wall of the installation hole, the test pen is easy to contact with the copper plate, that is, the common electrode copper plate, which affects the test result

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