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This circuit is nothing but a simple arrangement to demonstrate the elementary action 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.

If the above tests are positive you can assume that the triac is healthy.

M10LZ47 Datasheet PDF – Toshiba

Thanks for pointing out. Yes now it is ok and working Mt2 and Mt1 must be reversed otherwise it is not working I was ratasheet many times I would like to thanks all of you for the tips.

Are these some other types of triacs, in behaviour or so, than the TIC ones? MT1 and MT2 are labelled back to front.

Previous post Next post. The drive must go from MT2 to G. Testing triac using a multimeter. I agree with the previous comments. Great step by step instruction. The triac test circuit shown is incorrect and will not work as shown. Please research this point and correct the fucking diagram, datasgeet retards, instead of wasting peoples time.


Your email address will not be published. Almost all type of triacs can be tested using this circuit. Now press the push button switch S1.

Volt 20A TRIAC TO Isolated – NTE

IIRC the description of the test circuit has an error: The multimeter will show a high resistance reading open circuit. You may also like: MT2 should be at the top and MT1 at the bottom, next to datqsheet gate G. How to test an LDR. A multimeter can be used to test the health of a triac.

Now put the selector switch to a low resistance mode, connect the MT1 and gate to positive lead and MT2 to negative lead. If wired that way it will work correctly. The lamp must glow indicating the switching ON of triac.

Connect triac to the circuit as shown in circuit diagram and switch S2 ON. Wireless mains voltage tester. The multimeter will now show a low resistance reading indicating the switch ON. First put the multimeter selector switch in a high resistance mode say Kthen connect the datashet lead of multimeter to the MT1 terminal of datashfet and negative lead to the MT2 terminal of triac there is no problem if you reverse the connection.


If the above tests are positive then we can assume that the triac is healthy. Anyway this test is not applicable triacs that require high gate voltage and current for triggering.

I just tested it on an actual part. The lamp must not glow. Thanks for your help! They are definately different. Circuit for testing a triac. When you release the push button, you can see the lamp extinguishing.

This is another approach for testing a triac. MT2 label should be at the top and MT1 datxsheet at the bottom side with the gate. Eric, MT1 and MT2 have to be reversed, as you say. I have test this circuit with a TICM triac. 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.