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How to choose a transistor-meter ?
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myf:
Hi everybody !

I want to test and sort transistors, Zener diodes and others components, i am looking for a solid case and an English display.
 
I prefer devices powered by a rectangular 9V-6F22 battery, but I only find device with small lithium-ion battery.

Theses devices t7 and tc1 are on aliexpress and ebay for about 15-20eur (= usd17-22).

http://www.aliexpress.com/item/LCR-TC1-3-5-160-128-TFT-Color-Display-Graphic-Multi-function-Backlight-Transistor-Tester-for/32974681318.html
http://www.aliexpress.com/item/2016-T7-New-Transistor-Tester-TFT-Diode-Triode-Capacitance-Meter-LCR-ESR-meter-NPN-PNP-MOSFET/32782708054.html

I don't know which I'll choose. Which one has one a more electrical robustness ?
User manual explains that more than 4.5Volt input may destroy the device.

Can I test :
  BJT npn and pnp  gain ? Even for Draligton transistors ?
  capacitance ? with its serial resistor ?
  Zener diode and led ? until 30Volt ?
  Triac and thyristor ?
  mosfet transistors ?

Do you have any advice about this device? (or other ones)

I post in this beginner forum because I don't want to change the device firmware

Thank you a lot.

F. from France.
schmitt trigger:
Scrolling down on the 2017 T7 New Transistor Tester TFT Diode Triode Capacitance Meter LCR ESR meter NPN PNP MOSFET IR Multifunction tester multimeter webpage, there is a table which describes the device performance and capabilities. What you can read from there, is what we can also read.

It does not specifically list Darlington BJTs, but very likely it would.
But if you want to be 100% sure, because the feature is particularly important to you, then you should contact the seller and directly ask the question.

For the price, I would not expect them to be very robust. Things that usually fail in cheap devices, are flimsy connectors becoming intermittent, the onboard battery not holding the charge, stuck display pixels, etc.

But this is an entry level product, which hopefully will last long enough for you to acquire something better later.
Kleinstein:
Testing zener diodes will be limited with these cheap 1 µC solutions, as there is obviously no voltage higher than some 5 V. So only low voltage zeners would  shown as such.

I don't know about gain with darlingtons, but this is likely also difficult. Here the measurement may not be accurate. In addition some Darlingtons include resistors that alter the behavior at low currents that are usually used for such test. So a single gain number is not a good description.

Triacs and tyristors can also be tricky as the test current is limited. So higher current devices may not be detected and AFAIK there is no measurement for the trigger current.

MOSFETs usually are detected, except for a few with a rather high threshold (e.g. > 4 V)
kripton2035:

--- Quote ---Testing zener diodes will be limited with these cheap 1 µC solutions, as there is obviously no voltage higher than some 5 V. So only low voltage zeners would  shown as such.
--- End quote ---
no I tested 27v zeners with one comparable tester and they were detected fine. there is a small transformer inside these testers (the one that have a KAA marked on the bottom of the zif socket) and they test zeners till 30V normally.
kripton2035:

--- Quote ---Triacs and tyristors can also be tricky as the test current is limited. So higher current devices may not be detected and AFAIK there is no measurement for the trigger current.
--- End quote ---
yes agree. don't buy these kind of testers in the idea to test triacs and scr's you can only test low current low voltages ones and they aren't many.
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