How to check a triac (with a light bulb) скачать в хорошем качестве

How to check a triac (with a light bulb)

I'll show you how to test a triac with a light bulb. The triac is installed on the control boards of most instruments and household appliances. A triac mounted on a board can be checked without desoldering it. To check, you only need to disconnect the control electrode and de-energize the entire circuit, disconnecting it from the working power source. First of all, it is necessary, using a reference book or the Internet, to determine the polarity of the electrodes of your triac A1, A2, G. To check the triac you will need a digital or pointer tester and a light bulb. A triac (symmetrical triode thyristor) or triac (from the English TRIAC - triode for alternating current) is a semiconductor device, which is a type of thyristor and is used for switching in alternating current circuits. In electronics it is often thought of as a controlled switch (key). Checking with a digital or dial tester: To check the part, you need to use a multimeter in resistance measurement mode, that is, as an ohmmeter. The contacts of the multimeter are connected to the working contacts of the triac, and the resistance value should tend to infinity, that is, be very large. After this, a small voltage from the power supply or battery must be applied to the control electrode. The triac should open and the resistance should drop to almost zero. If this is what happened, most likely the triac is operational. When the contact with the control electrode is broken, the triac should remain open, but the parameters of the multimeter may not be enough to provide the so-called holding current, at which the device remains conductive. The device can be considered faulty in two cases. If, before voltage appears at the contact of the control electrode, the resistance of the triac is negligible. And the second case, if when voltage appears at the contact of the control electrode, the resistance of the device does not decrease. Testing using power supply and light bulb: There is an option to test a triac with a simple tester, which is an open single-line circuit with a power source and a test lamp. You will also need an additional power source for testing. Any battery can be used, for example, type AA with a voltage of 1.5 Volts. The details must be called in a certain order. First of all, it is necessary to connect the contacts of the tester with the working contacts of the triac. The control lamp should not light up. Then it is necessary to apply voltage between the control and working electrodes from an additional power source. The working electrode is supplied with a polarity corresponding to the polarity of the connected tester. When connected, the indicator lamp should light up. If the triac transition is configured for the appropriate holding current, then the lamp should light even when the additional power source is disconnected from the control electrode until the tester is turned off. Since the device must pass current in both directions, for reliability, you can repeat the test by changing the polarity of connecting the tester to the triac to the opposite one. It is necessary to check the functionality of the device when the current flows in the opposite direction through the semiconductor junction. If, before applying voltage to the control electrode, the control lamp lights up and continues to light, then the part is faulty. If the control lamp does not light up when voltage is applied, the triac is also considered faulty, and it is not advisable to use it in the future. By following these simple rules, you can reject low-quality or worn-out parts. ▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰ Video sections (chapters): 0:00 Introduction 0:20 Triac on the vacuum cleaner control board 0:32 Marking triacs 1:00 Methods for checking a triac 1:10 Checking the triac with a tester 3:20 Checking the triac with a light bulb 5:13 Replacing the triac on the vacuum cleaner control board 5:32 Installation of a cooling radiator on a triac 6:27 Checking the operation of the vacuum cleaner after repair 6:36 Conclusion ▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰ And in this video I will show you DIY LED lamp repair    • Ремонт светодиодной лампы MAXUS  . ▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰ Subscribe to our channel and watch a video on the topic #howtocheckatriac, #triac. ▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰ Our social media channel following the links: Facebook -   / 1147375328749226   Instagram - https://www.instagram.com/delo__maste... Telegram - t.me/delo_mastera_boitsa Odnoklassniki - https://ok.ru/delomasteraboitsa VKontakte - https://vk.com/club141674316 ▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰ Thank you very much for your support friends 💕