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Fnirsi -TC3

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siealex:
Today I received a new motherboard for TC3 and installed it into my TC2. In general it works properly, however, there are several strange bugs.
1. Generator. The output frequency is exact only in Square and Pulse modes, in other modes (sine, triangle, sawtooth) it's way off, up to 2%, and changes only in large steps.
2. Oscilloscope. On high voltage ranges (1 V/div and higher) in DC mode the zero line is off by 100..300 mV in a random direction (depending on the range), usually up. Can this be adjusted?
3. Oscilloscope. Low time per division ranges (5 μs/div and less) have incorrect X scale. For example, a 500 kHz wave on the 2 μs/div range must be EXACTLY 1 large box wide, actually I see 14..15 waves per 12 boxes. A 100 kHz wave on the same range must be 5 boxes wide, actually it's 4 boxes (is it 2.5 μs/div???). The 10 μs/div range seems to work properly.
4. Voltage. There is a calibration mode with two points: 5 V and 20 V. After calibrating (using AD584 for 5 V and a step-up converter for 20 V), it displays 5 V, 7.5 V and 10 V correctly (+/- 5 counts), but 2.5 V is 1% off (high). Why?

solidhit:
I just received my TC3 today. The ESR meter is completely broken and always produces false results. I wonder, all those YouTube reviews and no one found the ESR meter doesn't work! 

indman:
solidhit, Don't trust Youtube reviews! Fnirsi DSO-TC2 and DSO-TC3 are toys in a beautiful case, nothing more! Isn't this clear?
I can’t say anything good or bad about the operation of the oscilloscope, since this functionality with such funny parameters interests me little.
It is of little use as a component identifier since the original code of the respected Markus Reshke and Karl-Heinz Kübbeler was transferred to the STM platform very poorly. Therefore, you cannot trust such a device to check components, and this is confirmed by many owners of these toys. And the resistance can be measured successfully and with greater accuracy with a conventional multimeter.
Here is one of the few examples of measurements that I posted in an extensive topic '$20 LCR ESR Transistor checker project"
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg4785317/#msg4785317
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg4785317/#msg4786418

solidhit:
Can anybody provide me with v0.2 of the firmware as I cannot find it on the official page? Just to verify the problem I have with the ESR meter has nothing to do with my present firmware version (v0.3).

kru.czekdb:
Hello, I damaged my dso tc3. charged capacitor 😔 I replaced u6., it works but I don't want to calibrate. can anyone help?

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