Products > Test Equipment
Hantek 6254BD 250MHz 1GSa/s PC/USB DSO
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Neekeetos:

--- Quote from: eevblogfan1 on October 28, 2019, 02:57:49 pm ---The iic itself seems to be the same for 0x13FD bytes as the cy_eeprom_dso6074bc.zip firmware posted by neeketos, but neeketos seems to have additional data beyond that.
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Bet this data is calibration and nothing interesting. I tested your version of cypress fw, but i see no changes in features, no functional gen appeared and bw not improved. It seems to me that functional cap is done via different fpga fw for particular models of scope. But, great that there is no need in dedicated programmer for cypress, as it flashes itself via usb....


--- Quote from: eevblogfan1 on October 28, 2019, 02:57:49 pm ---If anybody would like to decode the iic file, one way would be to go to section 3.4.3 Serial EEPROM Present, First Byte is 0xC2 of the manual here.  Although there might be better ways, perhaps sigrok has some utilities that automate the process, I don't really know to much about the project other than it seems they are fx2 gurus.
--- End quote ---

The great need in this "anybody" who knows cypress well and can extract info on how fw works. This is due to my findings - fpga eeprom is connected directly to cypress pins , thus could be read and programmed!
Pins are (PD* are cypress port pins ) :

* PD0 : flash_nCS
* PD1 : flash_CLK
* PD2 : flash_SI
* PD3 : flash_SO
* PD4 : flash_nWP
There are also 3 unsoldered jumpers nearby:

* PD5 : R197
* PD6 : R198
* PD7 : R199

Appocalypse_br:

--- Quote from: Microcheap on November 01, 2019, 02:40:54 am ---I'm not sure if I understood your 2nd problem, but there was a bug in the software version 2.2.4 (the one you are using) that I helped Hantek to identify and that introduced an offset error in the oscilloscope's channels. You need to update the software to Ver2.2.5 or downgrade to version 2.1.36 and run the self-calibration again.

https://www.eediscuss.com/forum.php?mod=redirect&goto=findpost&ptid=14725&pid=18097&fromuid=26055

--- End quote ---

Ok, but is not an offset problem, i have only proble 3 connected, no input signal in other channels, but as you can see the signal in channel 3 over shoot the screen and affect the other channels. Even in v2.2.5 screenshot down.

Microcheap:
...

Ah, ok I managed to reproduce the problem. I first thought it could be coupled noise in the inputs but it looks like it just another bug in the software, it happens when using a x1 probe and the vertical scale is set to 100mV or smaller and the signal is >= 2Vpp so it gets out of the screen area.

Not really an issue since that, for a 2Vpp signal, you will have to set the volt/div to a scale greater than 100mV to be able to see the waveform correctly anyway.
Appocalypse_br:
Yes thanks for the 2.2.5 info, but its a bug confirmed.
PointLess:
Anyone ran into a problem that 6254 stopped displaying signal waveform in software and solved that? I've already tried restarting/reinstalling/etc, even other PC, still no luck...
I use Windows 10 x64 1909 and latest 2.2.5 software, it shows 6254 connected, turning voltage knob makes relay clicking noises.
Need help badly if anyone knows any suggestions.
I got a eeprom programmer so reading/writing all 24/25/etc eeproms is not a problem.

PS Problem solved. Looks like the 3.3v PWM dc-dc is a weak point in schematics, so changing it to a typical linear LDO 3.3v stabilizer like 1117-3.3 closes the case forever. I was really surprised why they used PWM instead of linear dc-dc because it makes little sense in minimizing noise over power supply lines for such sensitive equipment.
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