Turn-on voltage testing method of switching tube

Abstract

The invention discloses a turn-on voltage testing method of a switching tube. The testing method comprises the following steps that: an initial testing voltage upper limit, an initial testing voltage lower limit, and a target current are set; the testing voltage is set as a value that is obtained by multiplying a sum of the initial testing voltage upper limit and the initial testing voltage lower limit by a compressibility coefficient, and a drain terminal current of the switching tube is tested; a relation between the drain terminal current and the target current is determined; if the drain terminal current is larger than the target current, the testing voltage is used as a new testing voltage upper limit, and if the drain terminal current is less than the target current, the testing voltage is used a new testing voltage lower limit; the above steps are repeated by using the new testing voltage upper limit or the new testing voltage lower limit and preset repletion times so as to obtain a first testing voltage upper limit and a first testing voltage lower limit; and a turn-on voltage of the switching tube is tested and obtained in a range from the first testing voltage lower limit to the first testing voltage upper limit. Compared with the traditional testing method, the provided method has the high testing efficiency.

Description

technical field [0001] The invention relates to component testing technology, in particular to a method for testing the turn-on voltage of a switch tube. Background technique [0002] To determine the turn-on voltage of the finished switching tube, testing is required. Taking the mode tube as an example, a certain voltage is added to its gate as a test voltage, and a fixed power supply is applied between its source and drain, so that a current flows between the source and drain, and it is tested whether the current reaches the target current. When the target current is reached, the corresponding test voltage is the turn-on voltage. [0003] The traditional method of testing the turn-on voltage is to start from 0 volts, gradually increase the test voltage with a fixed step size, and then check whether the current reaches the target current. In order to achieve higher accuracy, the fixed step size is usually small, such as 0.05 volts. However, when testing products with hig...

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Problems solved by technology

However, when testing products with high turn-on voltage, there may be a large gap between the lower initial test voltage a

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