Products > Test Equipment
Upgrading the Hantek DSO4072C and DS4104C oscilloscopes bandwidth up to 250MHz
bianchifan:
--- Quote from: rlohmann on April 26, 2019, 08:48:31 pm ---But finally, after adding the missing parts:
- DAC902E (U62)
--- End quote ---
Are you shure it's the correct one?
When looking at the (not really sharp) pics all 14! data lines bit 1 thru 14 seem connected.
Compared to my shortly arrived 6074, where bits 13 and 14 are not!
So maybe DAC904 is used at DSO40nn...
Microcheap:
--- Quote from: bianchifan on April 27, 2019, 09:25:43 am ---Are you shure it's the correct one?
--- End quote ---
Yes, the DSO4004C series uses DAC902E and, as far as I know, the 6074BC used it as well, unless Hantek has changed it in a new PCB revision.
For the new Hantek2000 series devices, Hantek is using now a Chinese DAC (made by 3Peak) but, it is pin compatible with the DAC902E.
tkoop:
I've just checked on my scope. On the left resistor network is only the clock signal active.
Muellmann:
I recently bought a Hantek DSO4084C and did the upgrade to DSO4254C.
The Info screen now shows the upgraded model but it seems not really work on 250MHz.
When I set 20ns timebase I see the signal with high time resolution (amazing!). When I switch to 10ns to take a closer look the waveform shows this with higher resolution and suddenly jumps to a filtered one (frustrating!). So obviously the software does not fully recognize the Model cheating.
I'm using:
Software 1.1.2(190701.0)
Hardware 501 001.001.000.000.000.000.000
FPGA a005
Does anybody know how to fix this behaviour? Did I miss something in hacking? Should I use an older firmware (is a downgrade possible?)?
Rainer
W1ZZT3XX:
Do you maybe have the AutoRange enabled?
Check that AutoScale -> AutoRange is OFF.
I did the same as you did and converted a DSO4084B to a DSO4254C. Everything went fine so far. The signal stays stable even at 200 MHz. I use the same specs You do.
I wrote a little hacking summary, that I will attach as pdf.
Edit: Uploaded updated hacking manual with added EEPROM hack. You can always see the current document on my github .
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