【 Weak current College 】 TRIAC judgment method 】

TRIAC apart from one electrode G still call control extremely, the other two electrodes are usually no longer call the anode and cathode, which are collectively referred to as the electrode T1 and T2. TRIAC is a N-P-N-P-N-5-layer structure of semiconductor, its symbols and internal chart shown in Figure 1-1.



Multimeter distinguish TRIAC electrode: first of all find out main electrode T2. The multimeter in R× 100, with black table amount received TRIAC of electrodes, red table pens respectively TRIAC's other two electrodes, if table-fixed on the black table amount received is the main electrode T2. Or you'll get black table pen and then swap to another electrode, measured by the methods above, until you find the main electrode T2. T2 OK then pressing the following methods to identify T1 and G. Figure 1-1 visible T1 and g is composed of two parallel PN reverse because of design needs and structural reasons, T1 and g resistance value between, there are still differences between forward and backward. Multimeter R× 10 or 1 stop logging R× T1 and G between, reactive resistance, if one is around 22 Ω, one at a time is around 24 Ω, the smaller the resistance once (forward resistance) black table amount received is the main red table T1, the electrode pen received is controlled very G.