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

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Evi:

I do not know how true this is, because the guy only claims to have hacked the device. Without any affirmations.


https://www.nickbel.com/2019/01/28/hantek-2c42-2d42-2c72-2d72-hack.html#cut

tsman:

--- Quote from: Evi on February 04, 2019, 07:50:24 am ---I do not know how true this is, because the guy only claims to have hacked the device. Without any affirmations.

--- End quote ---
He's managed to patch the firmware to reenable the AWG on the C models. He won't release the patch however. He knows roughly what the missing parts are but doesn't know the values or the exact DAC/opamp used.

R915 needs to be removed as otherwise a 400Hz signal is connected to the DAC output as well. Not sure why it is 400Hz. If it was 1KHz then it would have been then the calibration signal.

Microcheap:

--- Quote from: AxGxP on February 03, 2019, 03:55:57 pm ---Any body measured more then 400V in DMM mode?

--- End quote ---
No. The datasheet states that the maximum voltage is 600V, but I don't use nothing that generates such high voltages and if I needed to measure something in this level, I would use a more trustworthy meter.


--- Quote ---Drop voltage in diode mode 0.999 V max, is it a hardware limit?

--- End quote ---
Maybe, I couldn't find the multimeter's chipset datasheet, but apparently the CS7721CN is pin compatible with FS9721 that can measure diodes up to 1.5V. Hantek specifies the maximum 1V diode voltage in the manual, though.

I'm also attaching some slightly better pictures of the PCB. The marking on U12 was erased using some chemical that dissolved the IC's case.  I can barely see only the last 3 letters of what looks like a brand, it is ...FAK or ...PAK.
U14 and U15 are marked "3130", TPS73130 maybe? http://www.ti.com/lit/ds/symlink/tps73130-ep.pdf

AxGxP:
Do you have ST-Link? Can you readout a dump of from your device. It will be interesting to compare it with lower version.

gf:

--- Quote from: AxGxP on February 03, 2019, 03:55:57 pm ---Any body measured more then 400V in DMM mode?

--- End quote ---

Connected to my insulation tester, I measured 946V DC, so there does not seem to be a 400V limit.

DVM is isolated from the oscilloscope, and the insulation did withstand 1kV as well, >= 2000MOhm - beyond the limit of my insulation tester  :-+.

Still it is specified only for 600V CAT II, so one should not go beyond that.

gf

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