I checked on two thyristors (the third kind came out to me), in each direction it shows the same.
Czy wolisz polską wersję strony elektroda?
Nie, dziękuję Przekieruj mnie tam
brofran wrote:I understand that you refer to my post because @ HD-VIDEO he wrote nothing about the picturePins KAA what are the contacts, what are they used for?
For testing Zener diodes, up to 30V. The T7 tool on the KA pins exposes approx. 37V. Probably through some inverter, because the battery after 3.7V, I wrote in the topic.
CMS wrote:Provide the thyristor symbol. I have found three identical thyristors or maybe triacs and on all the correct identification depends on the method of insertion. The subtitles on those found were not completely worn off, I was able to read that they were KT205 / 600 or KT206 / 600. 5 - triac, 6 - thyristor. I also noticed that Darlington mentioned earlier (BDP647), depending on the way it was inserted into the socket, is identified as PNP or NPN. In fact, there is NPN. I still do not know if this is a malfunction of my tester or if all or most of them work similarly but to be sure, I recommend unmarked "three-legged" elements to measure in two different positions.I checked on two thyristors (the third kind came out to me),
vodiczka wrote:It seems that triacs have these types. Fast on T7: - trike Tesla KT207 / 600 (inscriptions indelible) - no matter how I insert it = transistor NPN, hFE = 28, Ube = 465mV, Ic = 3.3mA - triac KT774 - identified as a triac, but in one of the combinations as NPN, hFE = 0 (!), Ic = 0uA I will try Thyristors tomorrow.I still do not know if this is a malfunction of my tester or if all or most of them work similarly but to be sure, I recommend unmarked "three-legged" elements to measure in two different positions.
vodiczka wrote:One is surely BT169G, I will not recall the other one at the moment, I will check tomorrow.Provide the thyristor symbol.
Stanley_P wrote:It is strange, after all, the same "tests" should take place on all legs. It comes to my head that it may work so that the test lasts until the first "sensible measurement", and then no longer checks other possibilities. Why, then, did it work for me in all directions?It seems that triacs have these types. Fast on T7: - trike Tesla KT207 / 600 (inscriptions indelible) - no matter how I insert it = transistor NPN, hFE = 28, Ube = 465mV, Ic = 3.3mA - triac KT774 - identified as a triac, but in one of the combinations as NPN, hFE = 0 (!), Ic = 0uA
CMS wrote:That's exactly what I thought, if the test was done equally for all combinations, the tester would "see" the difference and should display the error or both results for a change, eg every 2s.It is strange, after all, the same "tests" should take place on all legs. It comes to my mind that it may work so that the test lasts until the first "sensible measurement" is obtained, and then no longer checks other options.
CMS wrote:And why on Stanley one did not work on either sideWhy, then, did it work for me in all directions?
Stanley_P wrote:and on the other (KT774) just like on my - one way? This is where the differences in parameters decide.triak Tesla KT207 / 600 (inscriptions not marked) - no matter how I insert it = NPN transistor , hFE = 28, Ube = 465mV, Ic = 3.3mA
TechEkspert wrote:measurement Bestler transistor TG72 I wonder how would employees of "TEWY" would react if in 1965 they received such a device from Gulson? Of course, due to the mistake of Poczta Polska ...I wonder what the tester would say on the germanium transistor, does its characteristic mean that we are not dealing with silicon?
vodiczka wrote:Hello. There was no time for playing with the thyristors, but I took one more time for a quick pair of KT207 / 600 triacs. I have a box of never whisked kites, maybe 30 pieces. At 10pcs it came out to me: - 3 x NPN - 5 x Thyristor - 1 x Resistor 149.4? - 1 x in one or two combinations detected NPN, then a thyristor, sometimes always a thyristor. I did measurements in all pin combinations (I counted 6: 1-2-3, 2-3-1, 3-1-2 and then the same, the item rotated). This confirms the thesis that, at least in this case, there may be (also) the effect of parameter differences between copies. I would like to emphasize that measurements are made with a tester marked by eyed eyes T7 , i.e. a different model as being the main subject of this thread. However, as you can see the results of "research" are similar, and yesterday I happened to find a copy of the triac, which according to T7 is a transistorThis is where the differences in parameters decide.
EDIT Adamcyn wrote:I'm afraid you'd have to give them first aid quickly ...I wonder how the employees of "TEWY" would react if in 1965 they received such a device from Gulson?
TechEkspert wrote:The voltage of conduction. Silicon will never come down that low. And zero currents. Germanowe have quite a lot of them. This tester will not detect. At most "abnormally" high gain at low currents.I wonder what the tester would say on the germanium transistor, does its characteristic mean that we are not dealing with silicon?
bestler wrote:High probability (by analogy) that I have KT205 / 600 triacs and not KT206 / 600 thyristors as I initially thought. All 4 items are exactly the same as your friend's.Triak legend KT207 / 400 - detected once as a thyristor and after reversal as a transistor
TechEkspert wrote:He was checking someone, or perhaps the Chinese forgot to secure the prock before reading. Because you can have fun, but it would be good to desolder the original uC and replace it with a clean (fresh) / programmed by colleagues from the east with a batch, or yet another, and that original hide into a drawer for a rainy dayAs for the links provided by Wlodek22 and earlier https://www.mikrocontroller.net/svnbrowser/transistortester/ did anyone dare to exchange the firmware in the tester obtained at elektroda.pl? If so, I think that you can present how the update process works and what benefits it brings, and maybe someone managed to add the elektroda.pl logo displayed at the device startup
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Wlodek22 wrote:And that's it. Anyway, I would like to keep the original, because it's a matter of time when the day comes, probably it will be Friday, at the end of the working day ... And as with the previous tester, I will forget to discharge the capacitor before the measurementoriginal to the drawer, and experiments on the new one.
. Although now on a PCB with different sockets, it will also be a "discharger" so that you do not have to look for "something that has a higher resistor than a screwdriver" 
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Would this tester save me a few days of combination and showed differences in inductance or resistance on these windings (triple wire fi 0.5mm long about 15cm)?
TL;DR: LCR-T4 auto-tests 14 part types, draws only 12-15 mA per measurement, and “will be useful in every workshop” [Elektroda, TechEkspert, post #16556695] Accuracy stays within ±2 % for most resistors. Firmware flashing adds live-scan mode and Zener tests. Why it matters: you get multimeter-level insight from a €10 gadget.
• Supply: 9 V battery; 12-15 mA active, 20 nA sleep [Elektroda, 16556695] • R range: 0.1 Ω – 50 MΩ, C range: 25 pF – 100 000 µF, L range: 0.01 mH – 20 H [Elektroda, 16556695] • Typical accuracy: ±1 % R, ±3 % C, ±5 % L (user tests) [Elektroda, 16556695] • ESR read-out for electrolytics ≥1 µF [Elektroda, post #16556695] • Open-source firmware: AVR-based, 40 V boost for Zener mode [Elektroda, 16666684]
