Electronics > Beginners
Beginner's - removing diode
nForce:
Hello, I have a simple question.
Why do I have to remove a diode from the circuit if, I want to test if it's OK?
Thanks.
xrunner:
It's possible that the stimulus applied to the diode in-circuit might be corrupted and flow around the diode because other components are connected to it. You can try to test it in-circuit but it might not give the correct reading.
At most you could only de-solder one lead also and test like that.
Zero999:
--- Quote from: nForce on October 03, 2019, 11:58:01 am ---Hello, I have a simple question.
Why do I have to remove a diode from the circuit if, I want to test if it's OK?
Thanks.
--- End quote ---
It depends on the circuit. If the diode has other components in parallel with it, for example it's connected across the base-emitter junction of a BJT, it will read 0.6V in both directions, so will need to be removed from the circuit to be tested. If the diode is in series with the whole circuit, say for reverse polarity protection, it can be tested in circuit, as long as the connections to the power supply have been removed.
Kirill V.:
It depends if you want to test the diode or the rest of the circuit.
And if you are sure that the diode is not shunted, you can not remove it.
nForce:
What about other components: resistors, capacitors, inductors? I think, here you can leave the components in the circuit. Only if we plug out the power supply, right?
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