Testing Triak In Circuit Test

Discussion in 'General Electronics Chat' started by AHMARAFAH, Jul 30, 2006.

  1. AHMARAFAH

    Thread Starter Member

    Jul 11, 2006
    20
    0
    I Want To Know Clear Steps In Order To Test Triak Using Meter In Circuit Test:)
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Here is one of several test techniques that can be found by using google to search the Internet.

    http://www.uoguelph.ca/~antoon/gadgets/triactst.htm

    It is easiest to check a triac more thoroughly if you can isolate all three terminals from the circuit in which it is used.

    hgmjr
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    Yes, do the test out of circuit. If the tirac is of any size - meaning current capability - then it should exhibit no conduction anode to cathode and reverse, same for gate to anode. But the conduction gate to cathode shows low resistance in both directions. There's no pn junction foreward and reverse visible. If it's not a dead short, it's probably ok.
     
  4. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    I find I can switch the gate into an ON state using an Analogue meter (who remembers them..?) Red probe to gate, black to MT1. By carefully manoeuvring the probe on the gate onto MT2, I can then measure a short across the main terminals. Lifting the meter probes for a second switchs the Triac off, and a quick measure between MT1 and MT2 should now show open.
     
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