While many digital multimeters these days have a specific capability for testing diodes and sometimes transistors , not all do, especially the older analogue multimeters that are still in widespread use. This form of testing is able to . Ask any field or bench technician what their most-used piece of test equipment is and they will probably say a DMM (Digital MultiMeter ). These versitiale devices can be used to test and diagnose a wide range of circuits and components. In a pinch, a DMM can even substitute for expensive, specialized test. I used a digital autoranging. In this instructable I will be telling you how to test your transistors with the help of your multimeters.
Now, forget those circuits used for. If your meter has a transistor socket, set the function switch to hFE and simply insert the transistor leads into the proper holes of the socket. Wanneer we beschikken over een meter met een transistorvoetje , zetten we de functieschakelaar op hFE en prikken we de pootjes van de transistor in de juiste contacten van het voetje. Spring naar Setting Up the Multimeter – Setting Up the Multimeter. Insert the probes into the multimeter.
The black probe goes into the common terminal and the red probe goes into the terminal marked for testing diodes. Bipolar transistors are constructed of a three-layer semiconductor “sandwich” either PNP or NPN. Low resistance readings on the base with the black . For this, we use an ohmmeter. Electronics repair technicians often use a digital multimeter to test whether a transistor is working properly or not. If the voltage is too high or too low, the transistor is . In this article we will discuss how to test for a damaged transistor or diode.
Device testing can be done at two levels: functional and parametric. A functional test determines whether or not the device works well enough for the intended use. A parametric test measures all device parameters to see if they meet the specified . How to carry out resistance tests.
Things you must know FIRST. Using digital and analogue meters to test transistors. Free downloads and links to electronics sites worldwide. Several faults that can occur in the circuit and the accompanying symptoms are illustrated in Below Figure.
Symptoms are shown in terms of measured voltages that are incorrect. If a transistor circuit is not operating correctly, it is a good idea to verify that VCC and ground are connected and operating. Steps for using a multimeter in the Diode Test mode.
After reading this, you will be able to find out configuration of the device as well as find out its collector, emitter and base. Method to test a diode or transistor with an analogue multimeter. Identifying BJT Terminals. Keep the Multimeter in the Diode mode.
Keep the positive probe to the center pin (Base) of the transistor. Transistor Function on Multimeter. Rotate the dial to the diode symbol.
Test the transistors in faulty electronics to find out if problems can be fixed by replacing them.