Is this thyristor module considered bad ?

Discussion in 'General Electronics Chat' started by LETITROLL, Feb 14, 2014.

  1. LETITROLL

    Thread Starter Member

    Oct 9, 2013
    218
    2
    I have found continuity between the cathode and gate of this high power thyristor module , is this a sign of bad component ??
    or is it something normal for this type of SCRs


    [​IMG]
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,555
    2,375
    If it is zero ohms in both direction, then this indicates most likely shorted, there is normally a difference in resistance depending on polarity of the meter, there is direct continuity between the centre screw and the trigger terminal 5 as seen on the diagram.
    Are you testing on the resistance scale or diode check?
    Max.
     
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    on some of these modules, there is about 21 ohms between the cathode and gate.
     
  4. LETITROLL

    Thread Starter Member

    Oct 9, 2013
    218
    2
    I have just took a test with diode mode , and it displays 000 + beeping .

    i didn't check with ohmeter . i will and see what this is giving
     
  5. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    I get 15 ohms either direction with analog meter.

    Here is how I test.
    Light bulb with 120vac and a 1K trigger.
     
  6. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    Digital meter reads erratic on ohms and diode test.
     
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