What are the methods for detecting transistors of a multimeter?

Last Update Time: 2019-02-22 13:55:39

The result of the digital multimeter diode block display the forward on-voltage drop of the diode. Therefore, the diode block is used to detect the base electrode of the transistor, and then the DC current magnification of the transistor is detected by using the HFE block when detecting the function of the semiconductor Triode pin. That is, when the base of the transistor is determined, the remaining two pins are alternately inserted into the test socket of the human he, and the results detected twice are compared. The c and e pins marked by the corresponding HFE socket with a large value are the c and e pins of the detected triode.


2.Methods for detecting virtual welding or open circuit.

At present, many electrical equipments use CPU as the control circuit. Because of the high price of CPU, when troubleshooting the electrical appliances, Do not have to do not move CPU, easily, but should first detect the components related to it, the specific methods are as follows.


Put the digital multimeter in the 2m block and check the pins of the CPU with reference to the drawings. If there is a corresponding resistance (the internal CPU is made up of miniature transistors, diodes and etc.), there is no virtual welding or wire breakage in the pins of the CPU; If the detected resistance value is ∞, it shows that the detected pin circuit has been broken, and can be eliminated by adding tin rewelding and other methods.


This article is from Allicdata Electronic.