Showing posts with label Test MOSFET. Show all posts
Showing posts with label Test MOSFET. Show all posts

Tuesday, November 30, 2021

Multimeter use how to test MOSFET

How   to   test    MOSFET  with   multimeter

Multimeter   use   how   to   test    MOSFET  with  Digital  Multimeter   and   Analog    Multimeter 
MOSFET  TESTING    Mosfet working principle  is  input voltage control output current  , we can use  basic bias to test whether it is a  bad or good mosfet .  Mosfet has  Gate  Drain and source legs , take  part number  to find  leg function from datasheet then connect test leads as photo. Note  analog  multimeter on this testing  when set to  resistor  test function or Ohmmeter  , the black test  lead supply  V+  and  the red test lead supply V-  ; the reason is  the black test  lead is connected with positive polarity of internal battery and the red test lead is  connected with negative  polarity of internal battery. If you are unsure about polarity of  your multimeter test leads , you can check it with  multimer manual  or   ask   the multimeter  expert.

TEST   MOSFET  with Multimeter
TEST   MOSFET  with  multimetro  मल्टीमीटर
Connection diagram   to  test  MOSFET  with  Analog Multimeter.

Step to  check MOSFET  with  Analog Multimeter.
1.  Set analog multimeter to  Rx10K  as  this range the multimeter  will  supply 9VDC  from internal battery.  9VDC is  high enough  to bias gate leg so mosfet is working as  ON state.
2. Discharge  mosfet   by shorting  or connecting  3 leg  together  by  using  resistor's leg.   then do not  touch   the  legs.
3.  Connect test leads with mosfet leg as photo above
4. Use  resistor's  leg to temporarily  connect  between  G  leg and  D  leg ; the  pointer  of multimeter move  to  indicate  some  resistance  on ohm's   scale   as  photo.
5. After removing resistor's   leg  from mosfet's leg  the  pointer can  hold the same  position.