| Products > Test Equipment |
| SOLVED: “LCR-T7” tester - reliable? |
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| eti:
--- Quote from: py-bb on December 28, 2022, 01:32:20 am --- --- Quote from: eti on December 27, 2022, 04:47:23 pm --- --- Quote from: py-bb on December 27, 2022, 07:45:05 am --- --- Quote from: eti on December 27, 2022, 06:19:31 am --- --- Quote from: eti on December 27, 2022, 02:23:17 am ---Does anyone here in England have an LCR-T1 or LCR-T7 with a *genuine* Atmel chip to sell? --- End quote --- Attention!! ^ urgent --- End quote --- I really like mine but it did take a while to arrive from China, happy to buy another one if mine's of use: IC's an APT32F172 I really like it, very useful device, I was skeptical at first because .. well ebay and ships from China right? As others have noticed the soldering work is sub-par - there's a little spatter on blank areas of the board on mine but it was cheap and very useful and gives consistent readings so I'm happy overall. --- End quote --- That’s very kind but I’m looking for one with a genuine Atmel IC. What do you want for it? --- End quote --- Enough to cover P&P and the cost of a new one and I'm happy. As long as I'm not out of pocket. It's basically brand new, it arrived on the 23rd (it took a while obviously from China), but as I'm UK also you'd get it much quicker. They're better than you'd think and I fully intend to replace it if you do buy it from me. I just don't mind waiting for a replacement. --- End quote --- I appreciate it very much, but times are tight for now. I think I’ll wait it out for an Atmel-based model. Thanks so much for the offer though. Happy 2023! God bless you. |
| elecdonia:
--- Quote from: Swainster on December 26, 2022, 12:36:25 pm ---In my experience (of a single T7 version), it has been fine… …Had a look inside --- End quote --- Thanks for the PC board photos of your LCR-T7. Your unit contains a genuine Atmel ATmega324 MCU. This is confirmed by the MCU chip having 11 pins on each side, 44 pins total. This 44 pin package is unique to the Atmel MCU chip family which includes the ATmega324 and the ATmega644 . The other Atmel MCU chip frequently used in transistor testers ( ATmega328 ) has 8 pins on each side, 32 pins total. To the best of my knowledge all of the alternate Chinese MCU chips recently showing up in transistor testers also have 32 pins. Some are (deliberately) mislabeled as ATmega328. However their pinout and internal functionality is completely different. The Chinese manufacturers have cobbled together their own proprietary firmware. Its quality varies: 1) Usually several of the expected transistor tester features are missing 2) Some measurement results may be very inaccurate 3) It is impossible to upgrade or replace this proprietary firmware At this time none of the extensive library of open-source transistor tester software/firmware supports any of these alternative Chinese MCU chips. |
| elecdonia:
--- Quote from: Swainster on December 27, 2022, 05:57:55 am ---Oh, I just noticed that my component tester actually says LCR-TC2 on the front. I dont know why I thought it was a T7... though then again it says T7+ on the PCB :-// --- End quote --- The LCR- model number suffixes ( TC1, TC2, T7, T7+, etc.) printed on the outer case of these units seem to be randomly interchangeable. I haven’t yet determined whether the internal labeling on their PC boards is meaningful. |
| py-bb:
--- Quote from: elecdonia on December 28, 2022, 03:15:10 pm --- --- Quote from: Swainster on December 27, 2022, 05:57:55 am ---Oh, I just noticed that my component tester actually says LCR-TC2 on the front. I dont know why I thought it was a T7... though then again it says T7+ on the PCB :-// --- End quote --- The LCR- model numbers ( TC1, TC2, T7, T7+, etc.) printed on the outer case of these units seem to be randomly interchangeable. I haven’t yet determined whether the labeling on the internal PC boards is meaningful. -E --- End quote --- When I was buying one I was wondering about that, the specifications given on ebay listings are very poor, I decided based on pictures of things shown measured. The specs are also wrong like the one I have is supposed to top out at measuring 5Mohm, it measured 9.7 earlier. I've also found that it'll measure certain features only between certain ports, so say 1 and 3 is generally better (measures more) than 1 and 2. I'll take some pictures of mine soon - it can't hurt. That said I really like it. It's unusual in that it's a better product than the listings imply. |
| elecdonia:
--- Quote from: py-bb on December 29, 2022, 02:03:47 am ---When I was buying one I was wondering about that, the specifications given on ebay listings are very poor, I decided based on pictures of things shown measured. The specs are also wrong like the one I have is supposed to top out at measuring 5Mohm, it measured 9.7 earlier. I've also found that it'll measure certain features only between certain ports, so say 1 and 3 is generally better (measures more) than 1 and 2. I'll take some pictures of mine soon - it can't hurt. --- End quote --- When you get different results testing the same resistor (or capacitor) on different ports of the transistor tester (such as 1-2, 2-3, or 1-3) this means you need to perform the "self calibration" procedure. To do this you first need to assemble 3 very short wires (< 2 inches) twisted or soldered together. Then place them into the ZIP socket on the tester to short out all three port pins at the same time (1, 2, and 3). Next press power button on tester. Display should be "selftest." After some time passes it will display "isolate probes." Now remove the shorting wires. Selftest will continue and eventually the tester will shut off. Next time you test a resistor (or capacitor) the result should be nearly identical no matter which set of test ports (1-3, 1-2, or 2-3) the component is connected to. Note: Inductors and some other 2-wire components may require using ports 1 and 3 to test. |
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