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While JFETs also BJTs look alike, they operate differently. It remains important to know how to test every type.

Electronic circuits need that is all of the components contained inside that circuit function properly. If every about the components fail, it can have disastrous results to every devices connected to that circuit. Failed active components --- these kinds of like transistors, diodes and microchips --- are in many instances additional tough to diagnose besides failed passive components --- such as resistors; active components behave differently besides passive items while subjected to some range of voltages. If you suspect that a transistor has failed, the transistor must be tested previous to you strength the circuit upwards again.

Difficulty: Average

Directions

Things You'll Need

2 1000-Ohm resistors Needle-nose pliers Digital multimeter

Junction Area Effect Transistor (JFET) Test Procedure

1 Twist particular lead from the first resistor to the drain terminal on the transistor. Twist one lead from the next resistor to the source terminal on the transistor. Twist the free leads out of the two resistors jointly with the gate terminal on the transistor. Wait 30 seconds, and then remove the resistors from the transistor terminals.

Turn the multimeter on; set the measurement scale to "Diode Check." For an n-channel JFET, place the red multimeter probe on the transistor gate terminal, plus place the black multimeter probe on the drain terminal. For a p-channel JFET, place the red multimeter probe on the drain terminal also location the black probe on the gate terminal.

3 Examine the multimeter show. If the multimeter exhibits a "Pass" rating, the JFET is working properly. If the multimeter exhibits any "Fail" rating, replace the JFET.

1 Turn on the multimeter and sent the measurement scale to "Diode Check." For an NPN transistor, place the red multimeter probe on the transistor base terminal, and place the black probe on the collector terminal. For a PNP transistor, place the black multimeter probe on the base terminal, and place the red probe on the collector terminal.

2 Test the multimeter show. If the multimeter displays a "Pass" rating, remove the multimeter probe from the collector, place it on the emitter terminal, plus proceed to the next step. If the multimeter displays a "Fail" rating, remove the multimeter probes out of both terminals and replace the transistor.

3 Verify the multimeter display. If the multimeter shows a "Meet" rating, the transistor yous functioning properly. If the multimeter shows a "Fail" rating, the transistor need to be replaced.

Suggestions & Warnings

You may need to use the needle-nose pliers to twist the resistor leads to the transistor terminals if the transistor is installed from a little space.

References. electronic cigarette.

"Electronic Devices"; Thomas Floyd; 1996 All About Circuits: Meter Check regarding a Transistor: Junction Field Effect Transistor All About Circuits: Meter Check of a Transistor: Bipolar Junction Transistor

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