Can anyone tell me what the missing components are for? I assume that some may be for zener testing. Is there a full schematic, showing the missing components? Is it worth the trouble adding a rotary encoder and other missing features?
In the upper left corner are several unpopulated pads. Near the center are missing C9, U2, D2 & L1.
Hi, I'm looking for this kind of tester. I've checked the PDF (https://github.com/madires/Transistortester-Warehouse/blob/master/Documentation/English/Clone-Comparison-Chart.pdf) that lists all the clones and it looks like the Hiland M644 is a decent option. But the PDF is a few years old and I can't find this particular model anywhere on eBay or Aliexpress.
I liked that it can test Zener diodes above 5V and would have liked it to have external power too.
Are there updated recommendations? If not, what happened to this model and where to find it?
Cheers!
... https://de-m.banggood.com/Original-Hiland-M644-Transistor-Tester-LCR-Diode-Transistor-Zener-Quartz-Measurement-p-1279042.html
Greeting Horst
Is the display PCB also available?
I just found a post by snapper on the German forum where he made an updated version of the Hiland M644 PCB.
I'm not sure if he published it anywhere though?
same for a mega 2560 ... nothing so far ... but code is there ...
I tried your settings with a 16MHz ATmega644 tester but couldn't reproduce what you've seen. Also after running the RCL monitor a 1µF cap measured fine for all probe combinations.
Could be the test current (too low). Low wattage zeners need about 3 - 5 mA.
I have purchased an LCR-TC2 which appears identical to that in Swainster's pics(Reply #8574 on: May 09, 2023, 05:00:09 am). My pcb is marked T7-PLUS V2.0 also and f/w is V3.1E.
My tester exhibits odd behaviour when measuring resistors of 15 Ohms and 18 Ohms in that it identifies them as Inductors with some arbitrary value of inductance and with the nominal resistance shown. If I use 12 Ohms or 22 Ohms these values are correctly identified as Resistor with the nominal values displayed.
Have you run the self-adjustment (shorting all three probe pins)? BTW, that TC2's MCU is an LGT8F328.
Have you run the self-adjustment (shorting all three probe pins)? BTW, that TC2's MCU is an LGT8F328.
That procedure is not mentioned anywhere in the instruction pamphlet - so, no, I didn't do it.
Have done it now shorting 1-2-3 together and running a test. Shows 0.11 Ohms 1-2 and 0.14 Ohms 2-3. Then ran a test on the 15 Ohm resistor again and no difference - still says it is an inductor.