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A multimeter can be used to test the health of a triac. Trigger voltage in phase with MT2 at top to allow triac to operate in the first and third quadrants when AC is normally applied.

Yes now it is ok and working Mt2 and Mt1 must be reversed otherwise it is not working I was tried many times I would like to thanks all of you for the tips. First put the multimeter selector switch in a high resistance mode say Kthen connect the positive lead of multimeter to the MT1 terminal of triac and negative lead to the MT2 terminal of triac there is no problem if you reverse the connection.

Thanks for pointing out. How to test a triac.

This is another approach for testing a triac. The multimeter will now show a low resistance reading indicating the switch ON.


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You may also like: Anyway this test is not applicable triacs that require high gate voltage and current for triggering. I just tested it on an actual part. Eric, MT1 and MT2 have to be reversed, as you say. Your email address will not be published.

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MT1 and MT2 are labelled back to front. MT2 should be at the top and MT1 at the bottom, next to the gate G. I agree with the previous comments. This circuit is nothing but a simple arrangement to demonstrate the elementary action of a triac. How to test an LDR. If the above tests are positive you can assume that the triac is healthy. Leave a Reply Cancel reply Your email address will not be published. The lamp must glow indicating the switching ON of triac. Now put the selector switch to a low resistance mode, connect the MT1 and gate to positive lead and MT2 to negative lead.

The multimeter will show a high resistance reading open circuit. Previous post Next post.

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Great step by step instruction. The drive must go from MT2 to G. Wireless mains voltage tester. The triac test circuit shown is incorrect and will not work as shown. Circuit for testing a triac. Almost all type of triacs can be tested using this circuit. I have test this circuit with a TICM triac. MT2 label should be at the top and MT1 label at the bottom side with the gate. IIRC the description of the test circuit has an error: Please research this point and correct the fucking diagram, you retards, instead of wasting peoples time.


The lamp must not glow.

Are these some other types of triacs, in behaviour or so, than the TIC ones? Testing triac using a multimeter.

If the input is AC or pulsed DC, the lamp stays on while S1 is held closed, and then turns off at the next zero-crossing — i. When you release the push button, you can see the lamp extinguishing.

Connect triac to the circuit datassheet shown in circuit diagram and switch S2 ON. They are definately different.