How to check trinistor and triac. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Designs on transistors of different structures. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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There are many home-made probes and measuring instruments for testing performance, as well as an approximate assessment of the parameters of trinistors and triacs. For these purposes, I have been using for many years ... an ohmmeter (you can also use an ohmmeter operating in ohmmeter mode) with a supply voltage of 1,5 V.

When checking the trinistor, I connect an ohmmeter to it with a positive probe to the anode, and a negative probe to the cathode. First, I set the measurement limit "x1" and close the anode and control electrode leads with tweezers. The indicator needle deviates approximately to the middle of the scale. Then I remove the tweezers: if the trinistor is "sensitive", i.e. opens with a small control current and is held open by a small anode current - the position of the arrow will not change.

I carry out similar tests at the "x10" limit, measuring the resistance between the anode and cathode of the trinistor in the open state (some trinistors are held at this limit as well). If the resistance is in the range of 140 ... 300 Ohms, then the trinistor can be safely used in the design.

In the case of checking a trinistor with a high holding current, the indicator needle returns to zero division of the scale after the tweezers are turned off. I try not to use such a trinistor.

I do exactly the same when checking triacs: I connect an ohmmeter to the anode and cathode and bridge the leads of the anode and the control electrode.

Author: V. Sevastyanov, Voronezh

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