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Fnirsi -TC3

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CharlotteSwiss:

--- Quote from: tautech on August 16, 2024, 11:05:01 pm ---
If you do general repair ST42 is a very useful tool.
Cap ESR and LED test capability are what I've found the most useful recently plus all the other things SMD tweezers can do of course.

Nearly 2 decades of SDM tweezer use and couldn't be without them....far more useful than a DMM for measuring components.
And don't think they limit you to testing only SMD components............

--- End quote ---

I have always measured the ESR caps on my lcr T4. So with tweezers is it possible to measure it even with the component on the circuit? But the value expressed may not be too truthful, I imagine. Bye  :)

tautech:

--- Quote from: CharlotteSwiss on August 17, 2024, 12:58:26 am ---
--- Quote from: tautech on August 16, 2024, 11:05:01 pm ---
If you do general repair ST42 is a very useful tool.
Cap ESR and LED test capability are what I've found the most useful recently plus all the other things SMD tweezers can do of course.

Nearly 2 decades of SDM tweezer use and couldn't be without them....far more useful than a DMM for measuring components.
And don't think they limit you to testing only SMD components............

--- End quote ---

I have always measured the ESR caps on my lcr T4.

--- End quote ---
We each have our own ways of measuring what we need but I started my smart tweezers journey nearly 2 decades back after borrowing a benchtop LCR nulling bridge and shortly after also got into SMD.

That I also couldn't measure unmarked SMD caps always annoyed me, armed with just a DMM so I took the plunge and spent big for me at that time (long before tautech days) on a top of the line brand of SMD smart tweezers which served me well until ST42 came along which are next level and some.
ST42 has proven itself to be a many tools in one device and all I need for component measurement.

--- Quote ---So with tweezers is it possible to measure it even with the component on the circuit? But the value expressed may not be too truthful, I imagine.
--- End quote ---
Experience has taught me to be very wary of any in-circuit measurements and only when I can see the circuit is simple or there are no parallel paths will I trust such measurements.

KungFuJosh:
In circuit is always iffy. So are any ESR measurements from the TC1/2/3 etc devices.

Phil1977:

--- Quote from: indman on August 16, 2024, 05:54:54 pm ---
--- Quote from: Phil1977 on August 16, 2024, 05:48:20 pm ---But the cheapest of these clones just use the architecture of the original Karl-Heinz Kübbeler design and you can often flash them with the open source software.

--- End quote ---
Not exactly, you're wrong. Chinese firmware for such clones is blocked for reading. If the controller burns out, the author's firmware can only be downloaded if you install a new Atmega and if the pinout on the PCB allows it.

--- End quote ---
I can't confirm this. I have two chinese clones that could be programmed with the open source firmware. They still have a brownout problem - that´s why I want to install a new MCU anyhow - but not too soon.

indman:

--- Quote from: CharlotteSwiss on August 17, 2024, 12:58:26 am ---I have always measured the ESR caps on my lcr T4. So with tweezers is it possible to measure it even with the component on the circuit? But the value expressed may not be too truthful, I imagine.

--- End quote ---
You can test capacitors with a T4 even in a circuit. For this purpose, the author's firmware has a special mode C/ESR-in circuit, which reduces the measurement voltage on the test pins to 0.3V. Many owners of such clones even adapt special tweezers with protective diodes, so as not to damage the ports of the controller high voltage and it was more convenient to test the parts in the circuit. But, as you have correctly noted, the validity of such measurements in the circuit will be about 50/50, however, as with similar meters.
In-circuit measurements presuppose a lot of experience in such cases and a good knowledge of the circuitry of those nodes on the board, which you check. ;)


--- Quote from: Phil1977 on August 17, 2024, 07:34:40 am ---I can't confirm this. I have two chinese clones that could be programmed with the open source firmware.

--- End quote ---
What controller are your clones built on?

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