Multimeter use how to test IGBT and testing electronic components with multimeter

Multimeter  use  how  to   test   IGBT  using  Analog  Multimeter   and   Digital   Multimeter

IGBT  testing  with  multimeter    IGBT  has 3 legs  , namely  , Gate ,   collector  and  Emitter  , Its working principle  is  input voltage control output current.   we can use this basic bias to test whether it  is a   bad or good  IGBT. Important note analog Multimeter  use on this article it  is  a version that  black test lead  supply V+ and red  test lead supply V- , when  setting    to  resistance test function.



IGBT  testing  How to test IGBT




TEST    IGBT   Check  IGBT



Test  multimeter   Testing  electronic  device
                   Sample  IGBT  has  Gate  Collector   and   Emitter ( pin No.  1 2 3 respectively )



Step to test  IGBT  ON / OFF TESTING
1.  Take  IGBT  part number  to find  leg function from datasheet.
2.  Connect test leads with  IGBT  leg as photo above.
3.  Set analog multimeter to  Rx10K  as  this range it will  supply  9VDC  from internal battery.  9VDC is high enough  to  bias gate leg  so  IGBT is  working as  ON state.
4. Use  resistor's  leg to temporarily  connect  between  G  leg and C leg ; the pointer's of multimeter move  forward  to  low resistance  as shown  on  photo.
5. After removing resistor leg  the pointer 's of multimeter  hold
the same position  because   IGBT  is still working  as  ON  state , this is  for a  good  IGBT indication   but  the bad  IGBT  can not  hold  ON state  so  the  multimeter's   pointer   move backward  to   ∞  position after  removing resistor's leg.

6. Test OFF state ,  use resistor leg  to temporarily  connect  between  G  leg and E  leg.
the  pointer's of multimeter  that hold  the ON  state it  does  not  hold any more  ,  because  V -  from  E  leg will   bias   IGBT   to OFF  state.
6. Good IGBT  can bias to ON  state and  OFF state  but    bad  IGBT can not  bais to ON and OFF state.

IGBT  testing    check   IGBT
                    Bias   Mosfet  to  ON ,   temporarily  connect   G and C  leg


วัดไอจีบีที  Test   IGBT  test   electronic  components
                   Good IGBT  hold the ON state after removing  resistor leg
                  , the pointer  stay the same position but bad IGBT  can not hold  ON  state.



Test   multimeter   Test   IGBT

Bias   IGBT   to OFF  , temporarily  connect   G and E  leg   , the   pointer   ( ON state indicating ) will move backward  to ∞   position or   OFF  state.



Step to  check  IGBT  with  Digital Multimeter.

1.  Take  IGBT  part number  to find  leg function from datasheet.
2. Discharge 3  legs  by shorting  or connecting  it  together  then do not touch the leg.
3.  If   there is a diode at  C and  E  leg  , set  Digital Multimeter to diode test function ,
 Good diode will show  0.5-0.8V  voltage across it  when forward bias.
  and show "OL"  when  reversing  bias.
Bad   IGBT  ( shorted ) will   show 000V.
Bad   IGBT   ( open )  will show  "OL"  2 times
4. If there is  not  a  diode at  C and  E  legs.
    Set  Digital Multimeter to resistor  test function , the good  IGBT   has  result ;
Good  IGBT  will show  high  resistance   1  time  and   show  "OL"   1 time.
Bad mosfet ( short )  show  0 ohm  2 time.
Bad mosfet (Open)  show  "OL"   2 time.
IGBT
                                 Some model of  IGBT   has  Diode  at  C-E leg




Test  multimeter   TEST    IGBT  with Digital  Multimeter
                    
                     C-E leg testing   that   has  Diode ( test as same as  Diode)
                   Good  IGBT  show  voltage  drop  0.4-0.8V     1   time



Test  multimeter   TEST    IGBT
                   C-E leg testing  ( reverse test lead )  that   has  Diode  ( test as same as  Diode)
                   Good  IGBT show   "OL"   1 time.


Test  multimeter   Testing  electronic  device
                    C-E leg  testing   that  IGBT  has   not   Diode connected at C-E leg,
                    Good  IGBT  show  high  resistance   1  time



test  IGBT   Testing  electronic  device
      C-E   leg  testing  ( reverse test lead )   that  IGBT  has   not   Diode connected at C-E leg  ,
      Good   IGBT   show  "OL"   1  time.



5. Check  G  and C  leg  , connect test leads to  G and C leg.
6. Set digital multimeter to resistance test function.
, do  testing   then  switch   test leads and  do  testing  again.
Good   IGBT   will  show   "OL"   2 time  because there is an insulator at gate leg junction so  it  is very very high resistance  that multimeter can not measure that resistance ( show "OL" ).
Bad  IGBT (gate leak ) will   show  some  resistance.
7. Check  G and E  leg  , set digital multimeter to resistance test function.
8. Connect test lead to G and E leng ,  do testing   then  switch test leads and do  testing  again.
Good  IGBT  will show   "OL"   2 time  because there is an  insulator at gate leg junction   so  it  is very very high resistance  that multimeter can not measure this resistance .
Bad  IGBT  ( gate leak )   will show some resistance.


testing electronic components with multimeter
                    G and C  leg  testing  ,Good  IGBT  will show   " OL"   2 time.



Test  multimeter   test     IGBT
                   G and E  leg testing  ,Good  IGBT  will show   "OL"   2 time.



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