EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: malagas_on_fire on June 16, 2019, 08:56:41 pm
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Hi.
I was testing some BT136 Triacs, that have been used in some projects, using two LCR T4 board, one from fleebay and other from local distribuitor . Both read fine some of the triacs, identifing properly its pins but some of them are being detected as NPN transistors ... Should i assume this ones are faulty or make a DUT with low power such as a light dimming circuit to check them out?
Edit forgot to place image of the LCR T4.
- LCR T4 H
- LCR T4
Both are powered by NIMH 9V battery same brand and model, not clear about charge status... but results are consistent in both units.
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It cannot provide necessary current to properly test less sensitive triacs.
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Hi.
I was testing some BT136 Triacs, that have been used in some projects, using two LCR T4 board, one from fleebay and other from local distribuitor . Both read fine some of the triacs, identifing properly its pins but some of them are being detected as NPN transistors ... Should i assume this ones are faulty or make a DUT with low power such as a light dimming circuit to check them out?
Edit forgot to place image of the LCR T4.
- LCR T4 H
- LCR T4
Both are powered by NIMH 9V battery same brand and model, not clear about charge status... but results are consistent in both units.
Here are more photos from the testing
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It cannot provide necessary current to properly test less sensitive triacs.
Thanks for the reply. These are from the same manufacture NXP and same model :P So it cannot provide Igate to test them due to tolerances? About batteries they are outlet / stock off 9V NIMH battery from local market ...
Maybe i'll test them for real, but was expecting to avoid using these testers... cheapo testers...
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I guess these are without E suffix. Look into datasheet https://www.promelec.ru/pdf/BT136-600-NXP.pdf (https://www.promelec.ru/pdf/BT136-600-NXP.pdf), max trigger current can easily be 7 times higher than typical value. Not to say these testers barely provide enough current to work even with typ. trigger current value. You should consider with a grain of salt anything such testers show.
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Technical Specifications
Graphic LCD Resolution: 128×64 pixel
LCD Backlight : Yes
Controller: ATMEGA328P
Power Volatge: 9V layer-built battery / 2 li-ion batteries to form a 8.4V battery pack
Testing Speed: 2 seconds (1 minute is normal for large capacitor)
Shutdown Current: 20nA
Capacitance: 25pf-100mF (resolution 1pF)
Inductance: 0.01mH-20H
Resistance: ≤2100Ω
Resolution of Resistance Measurement: 0.1 ohms
The Highest Measured Value: 50M ohms
Provided Testing Current: Approx. 6mA
Product Size: 7.2 * 6.25cm (L * W)
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Thanks again for the info. Then It's is trying hard at its limits the triac with 6mA . I noticed two of them are marked BT136 - 600D but one as been detected has transistor and other has triac, I've marked with a sharpie the ones that hadn't been detected as triacs and tomorow i'll do a proper test.
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Had the same with some BT137, it did not bother me.
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Use another real tester, this one is under development for ever.I had good bjt showed as unipolar...for real standard devices the tester does the job but for some others,no.
Or make some testing rig,takes 5 mins.
Regards,pierre
Envoyé de mon iPad en utilisant Tapatalk
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Thats the plan b, using a dimming circuit which is up and running . I believe mentioned in the first post
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I've gonne ahead and tested with a current project for a smooth wake up light based on some dimming lamps :
https://youtu.be/DMxqZ8vKSeQ
They all performed fine :D
I've also ordered some BT137 that were in promotion on a local store, lets see what they can do....
Thanks for all info.
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Hi
sorry for the delayed post but also tested the BT-137 brand new from a local store both testers report as transistors and therefore not much current for driving the gate . But they worked fine with improvised light dimmer.
Again thanks for the help.