How to distinguish the big power tube of induction cooker
IGBT tube good or bad detection method: IGBT tube is good or bad, can use pointer multimeter R, x, 1K to detect, or with digital multimeter "diode" file to measure PN junction forward pressure drop to judge. Detection before IGBT tube three pins to avoid short circuit discharge detection accuracy influence; two branches with a multimeter pen and then measuring G, E and G resistance C poles, poles, the normal IGBT, the measured values are infinite; finally, the pointer multimeter red pen is connected with the C pole, E pole with a black pen, if the measured value is about 3.5K, positive guide damping diode through resistance. For digital multi tube, under normal circumstances, the forward voltage drop of EC between IGBT is about 0.5V, which is the forward voltage drop of the damping diode. If the resistance between the three pins of the IGBT tube is small, the IGBT tube has been broken down. In practical maintenance, IGBT is mostly breakdown damage. The detection methods of X10K file pointer table: first the three feet short of the pipe, and then use the multimeter black pen is connected with the G foot, red pen is connected with the E pole once, then two million in positive and negative list with EC or CE, then the multimeter display value is very small, can understand the trigger after conduction. If you use the black pen with E feet, the red pen is connected with the G foot at a time, then we use the two million in positive and negative tables connected to EC or CE, only E feet in the black pen, the red pen is connected with the C pin, the multimeter will show some resistance, the resistance and damping resistance of the diode. Black pen meets C feet, red pen meets E feet, showing infinite. In this way, the measurement can basically determine whether the pipe is in normal conduction state, or whether there is a breakdown or disconnection.
Pointer type multimeter test:Test with the R X1K file, the red pen is connected with the C, the black pen is connected with the E, reading is 7K ohm, the rest no matter how test, resistance is infinite, the tube is good, once the readings (whether resistance size), that the pipe has been bad.
Using digital table testing:GCE three feet with digital multimeter diode files, any feet are not connected, that is, the buzzer does not call, control G and drain D, there is a positive measurement of more than 530 (diode gear test), the remaining number is not displayed as a normal tube;
