Common ways to test electronic components with a multimeter
Common methods for testing electronic components with a multimeter, tips for testing electronic components with a multimeter, using a multimeter for resistance testing, capacitance testing, diode testing, inductance testing, and transistor testing, etc.
1. Resistance test
Chip resistors are generally printed with resistance identification characters, such as 103 (resistance value is 10K), 102 (resistance value is 1K). Use a multimeter to test the resistance range and compare it with the marked value to know whether it is normal.
2. Capacitance test
Many digital multimeters have a capacitance test setting. Short-circuit the capacitor first to discharge, adjust it to the capacitance test setting, and then connect the capacitor to be measured to the two dedicated test ports for the capacitor. Then the capacity can be read. If you only roughly determine the capacitance If it is good or bad, use the resistance level or buzzer level to test. The capacitor should not be able to detect the resistance value (infinity) or the resistance should change from small to large and then to infinity, then it is normal.
3. Diode test
According to the unidirectional conductivity of the diode, use the buzzer setting and connect the red and black pens casually first. If there is continuity (with a numerical display), the red pen is connected to the positive pole of the diode, and the black pen is connected to the negative pole. The red and black ratios are reversed. There should be no value displayed (just like the display content in the default untested state), so it can be judged as normal after testing twice, otherwise it is abnormal.
4. Inductance test
Some multimeters have an inductance test mode, which can test the inductance. The method is similar to that of testing capacitance. If there is no inductance test function, you can only use the buzzer mode or the resistance mode to test whether the inductor is open circuit (the multimeter will make a sound if you use the buzzer mode to test the normal inductance. ), if the inductor is short-circuited, it cannot be determined. There is a special capacitance and inductance meter for testing, and the LCR bridge is the best to use.
5. Transistor test
The internal structure of a triode is close to that of a diode, and the judgment method is similar to that of a diode.
