Multimeter use how to test TRIAC testing electronic components with multimeter

Multimeter    use   how   to   test    TRIAC      with   Digital  multimeter   Analog  multimeter

TRIAC  TESTING   Triac  has  3 legs  ,     T1   T2  G  and  some datasheet  named as   A1  A2  G and some datasheet named as   MT1  MT2  G.   You can use analog multimeter or  digital multimeter to test   good  Triac or bad Triac.  This   article will   explain   the step  to  test.

                                HOW TO  TEST  TRIAC

Step to test  Triac with  Digital multimeter.
1. Take  triac part number to check with datasheet and find pin function.
2. Set digital multimeter to resistanc test function.
3. Test T1 and  T2 leg  then switch test leads and  do testing  again.

Good triac will show  "OL"    2 time  , for  the first and the second measurement.
Bad triac will show  some resistance .

                                 Example  triac   has  T1  T2   G ( pin number 1 2 3 respectively  )

                               Test   T1 and  T2 leg , good triac show  "OL"  2 time.

Test   T1 and  T2 leg , good triac show  "OL"  2 time.

4.  Test  G and  T1  leg  then  switch the test leads  and do testing  again.
Good triac will show  some resistance 2 time  , for the first and the second measurement.
The resistance value is closest together for the both measurement.
Bad triac ( shorted )  will show 0 ohm  2 time , for the first and the second measurement.
Bad triac ( open )  will show OL ohm  2 time , for the first and the second measurement.

Test  G and  T1  leg , there is some low  resistance for good triac

Test  G and  T1  leg , there is some low  resistance which  closest to the first testing

5.  Test  G and  T2  leg  then  switch the test leads  and do testing again.
Good triac will show  "OL"  2 time  , for the first and the second measurement.
Bad triac ( shorted )  will show 0 ohm  2 time , for the first and the second measurement.

Test  G and  T2   leg , good triac   show OL  2 time.

Test  G and  T2   leg , good triac   show OL  2 time.

Step to test  Triac with Analog  multimeter.
1. Take triac   part number to check with datasheet and find pin function.
2. Set analog   multimeter to resistanc test function   Rx10
3. Test T1 and  T2 leg  then switch test leads  and  do  testing  again.
Good triac will show  very very high resistance   2   time  , for the first and the second measurement ,
the pointer of  multimeter  point   at  ∞ scale.
Bad  triac will show some resistance .

Test  T1 and  T2 leg , good  triac  the  pointer   will point  at  ∞  2 time

4.  Test  G and  T1  leg  then  switch the test leads  and do  testing  again.
Good triac will show  some low  resistance  2 time  , for the first and the second measurement ,
the resistance value is closest each together.
Bad triac ( shorted )  will show 0 ohm   2 time , for the first and the second measurement.
Bad triac ( open )  the pointer  point  at  ∞   2 time , for the first and the second measurement.

Test  G and  T1  leg  , there is some low resistance.

Test  G and  T1  leg  , there is some low resistance , closest to the firs testing.

5.  Test  G and  T2  leg  then  switch the test leads  and  do   testing  again.
Good triac the pointer   will point at  ∞   2 time  , for the first and the second measurement.
Bad triac ( shorted ) the  pointer   will  point at  0 ohm  2 time , for the first and the second measurement.

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