Products > Test Equipment

New handheld scope+DMM, Fnirsi 2C23T, 2ch, 10MHz/50MSps (Nov 2023)

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pilatomic:
Your reply made me curious about how the measurements would be so wrong.
I thought I had seen the worst of the code... and boys was I wrong !
Ready for the laugh ?
Here are parts of FNIRSI's code :

--- Code: ---vavg = (vmax + vmin) * 0.5;
vrms = vpp * 0.354 // in AC mode
vrms = vavg // in DC mode

--- End code ---
This explains your issue ...


 :palm:

Panter72:
Hello guys, greetings to everyone!

I`ve bought this little marvel, and I must say, I LOVE IT!
I use it almost every day now. It is as useful as a camera on mobile phone. You have one with you all the time now. When was the last time you`ve grabbed your camera?
And I am not new in electronics (close to 30 yrs in laboratory chemical / biochemical /environment analysis).

Here is the question: Is there a way for this thing to do DMM data logging, since it can be connected to a PC and also has some internal memory? That would really be useful for me. I know I`m coming as ungrateful now, but having a trend-plot option would do a world for me.

Anyone?

P.S.
For now, I`ve only used the option of screen save as .bmp.

slavoy:

--- Quote from: pilatomic on July 15, 2024, 09:08:56 pm ---Your reply made me curious about how the measurements would be so wrong.
I thought I had seen the worst of the code... and boys was I wrong !
Ready for the laugh ?
Here are parts of FNIRSI's code :

--- Code: ---vavg = (vmax + vmin) * 0.5;
vrms = vpp * 0.354 // in AC mode
vrms = vavg // in DC mode

--- End code ---
This explains your issue ...


 :palm:

--- End quote ---
:palm: :-DD

dibu:

--- Quote from: Panter72 on July 16, 2024, 11:04:32 pm ---
Here is the question: Is there a way for this thing to do DMM data logging, since it can be connected to a PC and also has some internal memory? That would really be useful for me. I know I`m coming as ungrateful now, but having a trend-plot option would do a world for me.

Anyone?


--- End quote ---

I'm working on making an open firmware for this gadget, this and similar features can be added, I also think this is quite an useful little gadget, not very powerful but good enough, great value for the money. Unfortunately the firmware is sh!t, full of bugs, and not even the most basic optimization is done,compiled with O0.

I made some progress however this is now kind of on hold being summer and holiday season.

Tunas1337:
Hi dibu, thanks for taking the time to work on that stuff! I am, much like you, interested in reversing the firmware and either making mods, or rewriting it from scratch.

Would you mind sharing your Ghidra file (.gzf format) with me? I'd like to save time and avoid extra work if you've already figured out all the functions.

Thanks in advance!

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