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Hantek 2000 series - 2C42/2C72/2D42/2D72

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AxGxP:
42 and 72 has hardware differences.

The firmware is the same.
You can change the name of the device fro, 42 to 72 by changing one byte in the flash, but it is only the device name.
There no difference in functions.

Microcheap:

--- Quote from: AxGxP on February 13, 2020, 05:45:08 pm ---42 and 72 has hardware differences.

--- End quote ---

Do you know what are the differences between them?
I have the 2D42 that was changed to be recognized as a 2D72. I remember that I calculated the BW with and without the "hack" measuring the rise time of a fast rising edge pulse. The difference was clear what makes me believe that there is at least some sort o BW limitation in the FW depending on the model.

I'll try to repeat the test later and post the results here.

mostorer:
Hi Microcheap, I have a 2c42 from a few weeks and found this forum, so I decided to buy the DAC, opamp and what is needed and hack the scope to add AWG.
After adding and changing the needed components, except the R61, I flashed the dfu to calibrate but ...
... the screen appears upside down and, when pressing "calibrate" it says to me "calibration failed".  |O

Going back to the last firmware version from Hantek, the amplitude of the waveforms is a bit too much: a square waveform at 1V appears on the scope as 6V, while sine or triangular appear truncated. :(

where could I have gone wrong?

Microcheap:
To calibrate the awg you need to connect the Gen Out to the CH1 of the device using a coaxial cable, did you do that?

What is your FW and FPGA version?

mostorer:
Checked with the help of another scope...
Found that the 150ohm resistor at pin 2 of EL5166 was in short circuit, so changed with a new one. After that the things were better, but not exactly as expected.
I checked the outputs from DAC and levels were ok, so I decided to change the feedback resistor on the output opamp. From 560 to 186.
Now it works like a charm.
 :-DD

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