a BJT may be tested as two diodes using the ohms scale. a FET cannot be tested with just a multimeter.
By testing the C B E terminals.
To check the IC by the multimeter, you have to make sure that the pointer points at the current. You can then connect the multimeter across the check the IC.
If your multimeter has a transistor check (hfe), then place the Collector,Base& Emitter in the CBE port of multimeter. Turn the shaft to Diode mode. If the value is zero,skip that transistor. You can use the forward resistance of each junction, using the ohms range or diode check function. Put the leads on the Base and Emitter, then reverse the leads. You should get about 600Ohms forward bias and open circuit (infinity) reverse bias. Do the same between the Base and Collector. You should get the same results. Finally put the leads between the Collector and Emitter. You should get open circuit both ways around. Be aware that some high power transistors have a diode across the Emitter and Collector. These tests will just be a basic 'go - no go' test. It may pass this test and yet still not perform fully. You can see obvious faults, like a dead short both ways on each junction or across the Emitter to Collector.
To check frequency with a multimeter, set the multimeter to the frequency measurement mode. Connect the probes to the circuit or signal you want to measure. The multimeter will display the frequency in hertz (Hz) on the screen.
To identify the positive pin of a transistor, you can refer to its datasheet, which provides pin configurations for specific transistor models. For bipolar junction transistors (BJTs), the positive pin is typically the collector for NPN transistors and the emitter for PNP transistors. Additionally, in a circuit, you can use a multimeter in diode mode to test the connections: the base will show a forward voltage drop when connected to the positive lead of the multimeter.
what is load line of transistor what is load line of transistor
multimeter
There is no simple way to test FETs with either analog or digital multimeters. Bipolar transistors can be tested to see if their junctions are OK but they can also have failures that cannot be detected with a multimeter.
To check the frequency of an electrical signal using a multimeter, set the multimeter to the frequency measurement mode. Connect the multimeter probes to the signal source, ensuring proper polarity. The multimeter will display the frequency in hertz (Hz) on the screen.
the best way is to compeair the data sheet of that transistor to the readings of that transistor. . . . .and u can get the readings of that transistor by using a fungction genrator and a c.r.o
To check the resistance in a wire, you can use a multimeter. Set the multimeter to the resistance (ohms) setting, then touch the probes to each end of the wire. The multimeter will display the resistance measurement in ohms.
Because two diodes is not a transistor. There is an interaction between the junctions in the transistor, because of their proximity, that you don't get in the two diodes. The only use of modeling a transistor as two diodes back to back is to test a transistor with a multimeter as a quick go-nogo test for basic operability.