Multimeter test Resistor testing electronic components with multimeter

 HOW  TO  TEST  RESISTOR   with  Digital Multimeter and Analog Multimeter

RESISTOR TESTING   Resistor   is  a   basic electronic components. We have to test it when design circuit and  repair equipment.


Step  to  measure  resistor   by  Digital Multimeter

1.   Turn  power  off  or  remove power from circuit under test.  Failure to do this will cause damage to multimeter and electric shock.
2.  During testing  , do not touch  the tip of  test leads.
3.  Insert black test lead to COM- jack  and  red test lead to  VΩ  jack.
4.  Turn  rotary switch to  resistance range / resistance test function.
5. Connect   the  test  leads   to resistor under test terminals.
6. The display will show some resistance value.
Good resistor should show  measured  value that is close to  its specification value.
Bad resistor ( open )  show  "OL"  ( over range )  on meter' display.
Bad resistor ( Degrade , resistance value  is much increasing  or decreasing )  get   measured  value that   is   much different from  its  original   value.


วัดตัวต้านทาน   Test resistor
0.5K ohm resistor and meter show  measured value   0.491K ohm
so  this is the  good resistor.



Step to measure  resistor by  Analog Multimeter
1.   Turn power  off  or  remove power from circuit under test.  Failure to do this will cause damage to multimeter and electric shock.
2.  Never  touch  the tip of  test leads while  testing.
3.  Plug  the  black test lead to  - COM  N  jack  and   red test lead   to  +  P  jack.
4.  Conduct 0 ohm adjustment   the test leads and every time that change resistance ranges  must make  0 ohm adjustment  by this  multimeter   will  provide the  accurate resistance testing.
4.  Turn   rotary switch to  resistance x 1K  range ( and read 7.  about  select  Rx )
5.  Connect the  test lead   to resistor under test terminals.
6.  Read resistance value from  Ω   scale
7.  The good resistance ranges setting  , make the pointer point  in the  area that  easy to read scale. ( Rx1 Rx10 Rx100 Rx1K Rx10  setting )


Test resistor
1K range setting   is not  suitable for  270K ohm as the pointer point at around the edge of scale




Test  multimeter   Test resistor
Easy to read scale the pointer should  point around this area on photo , not at  the edge.



RESISTOR  test   วัดตัวต้านทาน
Better and suitable  resistance  range setting  for  270K ohm is  Rx 10K.
Notice the pointer point at    the easy to read scale.



Good resistor should get the   measured  value that  is closest  to  its specification value.
Bad resistor ( open )  will   always   point  at  ∞  resistance scale.
Bad resistor ( Degrade ,resistance value  is much increasing  or decreasing  )  get  the measured  value that   is much different from  its  original  value.