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New 2ch pocket DSO+SG - Zeeweii DSO2512G

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timschuerewegen:

--- Quote from: Faissal on December 04, 2023, 10:45:28 am ---How about my PCB V9.1? is there any chance to update? :)
--- End quote ---
Yes, I think you can upgrade to my modified V1.3.0C firmware (and newer FPGA firmware). First you will have to dump your SPI flash via either an external programmer, or via USB FEL mode. For entering and using USB FEL mode see one of my previous posts. You can also enter USB FEL mode by inserting a microSD card with a special image on it. You can find it here.

Faissal:
Can you share your modified firmware?

timschuerewegen:

--- Quote from: Faissal on December 06, 2023, 08:52:01 am ---Can you share your modified firmware?

--- End quote ---
You can find latest modified V1.3.0C firmware on my Discord server. It is a work in progress. See post 486 for the link. I highly recommend that you first dump your SPI flash so that I can check your V1.2.8B firmware and FPGA firmware, and can upgrade the FPGA firmware in your SPI flash dump.

Dry:
Just have received the thing. Board 9.15, firmware 1.3.0C. Some observations and bugs discovered.
1. The AUTO function doesn’t detect the waveform below 7 Hz. So, if the screen covers the wave only partially, the frequency cannot be displayed. Manual timeline setting should be used.

2. In two channels mode sometimes after the frequency change in one channel the displayed value and the waveform are completely wrong. For ex. when the wave frequency (meander) is 2 MHz, the shown value is 2,29 Hz (!). If I adjust manually the time value, the waveform changes and the displayed value becomes correct.

3. The saved images may change after the capture! If I save a screen with a box over (for ex. when frequency adjusting), the value in the box will be replaced in all saved images with the last one. It looks fantastic, but I rechecked the issue, the oscilloscope changes saved images.

4. The generator makes good waveform shape, but the frequency is not very accurate. In the Hz range the generated frequency sometimes is 10-15% over or under the selected one.

To note that although the last digit changes the frequency, it cannot be saved and is rounded to the previous one.
5. DC detection is not accurate as well. The difference between the values when the polarity changes grows with the vertical scale value. I calibrated the 0 many times, the best results were obtained when the both channels closed and set to the x100 (probes off). However if the 8,25 V battery at 2.00 V per div. shows +8.33 V and -8.54 V, at 10.0 and 20.0 V per div. it shows near +8.00 -9.00 and +7.50 -9.60 V respectively. My old CRT oscilloscope shows it correctly, regardless of polarity. May be nothing to do with one polarity supply scheme, but one should pay attention on it.

I understand that this model is pretty over, but hope that my observations will be useful not only for its owners but also for the developers, if one could transfer its to them.

Aldo22:

--- Quote from: Dry on December 13, 2023, 09:43:33 pm ---1. The AUTO function doesn’t detect the waveform below 7 Hz. So, if the screen covers the wave only partially, the frequency cannot be displayed. Manual timeline setting should be used.

--- End quote ---
That's pretty normal for a DSO.

--- Quote from: Tektronix ---To make automated peak-to-peak amplitude, period and frequency measurements,
the oscilloscope needs to display at least one full cycle of the waveform and have the waveform
fill as much of the vertical axis as possible without the signal going off the top or the bottom of the screen.
This ensures the measurement algorithms have a complete description of the waveform in memory upon which to make
calculations
--- End quote ---

Hantek does the same with "Autoset", see attached image @5Hz

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