Thyristor module can be divided into bidirectional thyristor
and one-way thyristor, we often when use to test the bidirectional thyristor, that how we can detect the bidirectional thyristor, teach you a simple multimeter is used to inspect the bidirectional thyristor.
First of all, we use a multimeter R * 1 Ω block, two pens and with red, black, respectively measuring arbitrary direction, the resistance between the two pins of bidirectional thyristor, results in the two readings for infinity.
If a group of tens of ohms, the group of red, black table receive two pins for the anode A1 and manipulation of G, the other sold out the foot is the second anode A2.
Determine the A1, G, and then carefully measure the bidirectional thyristor A1, G electrode positive and reverse resistance, reading by the measure of black pens and relatively small pins for the anode A1, red pens and the joint pin for manipulation of the G.
Then black pens and meet established bidirectional thyristor second anode A2, red pens and pick up the top of the anode A1, multimeter pointer deflection shouldn't attack at the moment, resistance to infinity.
With short wires to bidirectional thyristor A2, G very short moment, to G and positive trigger voltage, resistance between A2 and A1 about 10 ohms.
Then disconnect the bidirectional thyristor A2, short connection between G, the multimeter reading should stick to about 10 ohms.
Finally swap the red and black pens and wiring, red pens and pick up the bidirectional thyristor second anode A2, black pens and pick up the top of the anode A1.
Same multimeter pointer deflection should not attack, resistance to infinity.
With short wires will instantly again the bidirectional thyristor A2, G electrode nipple, give G plus negative trigger voltage, resistance between A1 and A2 is around 10 ohms.
Then disconnect the bidirectional thyristor A2, G electrode short wires, multimeter reading should be the same, insist on 10 ohms.
If fit this law, elucidated by bidirectional thyristor three pin was not damaged and polarity judgment is correct.
Warm prompt: in the high power thyristor module, need to be in the multimeter black pen concatenated section 1.
5 v dry cell, in order to improve the trigger voltage.
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