Author Topic: FNIRSI-1013D "100MHz" tablet oscilloscope (Read 932449 times)

Atlan · « **Reply #2700 on:** February 03, 2025, 07:59:22 am »

It was enough to edit the bytes on the SD card that select the boot mode

pcprogrammer · « **Reply #2701 on:** February 03, 2025, 08:11:58 am »

Quote from: Cadstar70 on February 03, 2025, 07:54:03 am

I got the FEL issue resolved by just formatting the sdcard in a pi and starting fresh.

Clearing the sector with the settings would have done the trick. Not sure where it sits now though. Atlan added new settings and may have moved it to another sector.

If it happens again just write with 0xFF from sector 16 to 800. That should do the trick.

pcprogrammer · « **Reply #2702 on:** February 03, 2025, 08:13:27 am »

Quote from: Atlan on February 03, 2025, 07:59:22 am

It was enough to edit the bytes on the SD card that select the boot mode

Missed this one while posting mine. Problem with this is that you have to know which bytes are used for this.

Cadstar70 · « **Reply #2703 on:** February 03, 2025, 08:13:54 am »

Yeah I can't past the 300mV calibration - I think my cheapy bench supply isn't stable enough. My AN8008 shows it bouncing around from 280 to 320mV. I may have to come up with a way to generate the 300mV and 600mV. I think the next step was 1.5V and I am stable by then so maybe I can come up with a quick circuit to generate some low voltage or something.

Cadstar70 · « **Reply #2704 on:** February 03, 2025, 08:19:12 am »

Since my track record on finding info around here is so low let me just - who has a link where I can buy one of those RTC modules, because I certainly need one of those!

Cadstar70 · « **Reply #2705 on:** February 03, 2025, 08:29:32 am »

Actually I may have just forgot to set the notification confirmation on because I just tried again and got through calibration successfully!

pcprogrammer · « **Reply #2706 on:** February 03, 2025, 09:35:33 am »

Quote from: Cadstar70 on February 03, 2025, 08:19:12 am

Since my track record on finding info around here is so low let me just - who has a link where I can buy one of those RTC modules, because I certainly need one of those!

You can search on Aliexpress. I bought mine from this supplier there: https://www.aliexpress.com/item/1812869576.html

Cadstar70 · « **Reply #2707 on:** February 03, 2025, 09:56:00 am »

Sweet, thank you. Looks like I can get one from Amazon, it'll cost a lot more but I'll have it quick. Seems pretty easy to install.

Is the DC shift calibration documented someplace? I'm not sure I understand what is being done in Atlan's video. Looks like I need a sign wave. I'm working on finishing up a little pi pico based AWG, hope to have it done tomorrow to use for this.

Atlan · « **Reply #2708 on:** February 03, 2025, 10:16:04 am »

Use any 5V power supply, a limiting resistor for the LED, a stable voltage source can be used, the red LED has 1.2V, a 10uF and 100n capacitor for the LED, and a 50k trimmer. You can set the required 300 and 600mV with the trimmer. And in fact it is not critical, the original firmware does not calibrate anything and everyone is happy

Cadstar70 · « **Reply #2709 on:** February 03, 2025, 10:27:38 am »

With all the hard work that has been put into this project, I would be remiss if I didn't calibrate fully with nice stable sources! The fact that stock firmware doesn't have this level of sophistication just makes me want to calibrate all the more!

Cadstar70 · « **Reply #2710 on:** February 04, 2025, 07:44:32 am »

I whipped up a quick circuit to stabilize my lower voltages and re-calibrated again nicely. Finished up my little pi pico based AWG too and although it works quite well it has a limitation I didn't think about. There is no dedicated amplifier so I am limited to the power available on the pi. Best 10K sine wave I can produce maxes out at about 3.22V - I cannot get a 4V signal out of this. There is no offset adjustment at all on it either.

Not sure if I should bother trying to wing it on the DC shift with a lower voltage. Going by the video we want 4V to do this. I do need to get a good AWG but don't have the funds at the moment so that may have to wait a bit.

Really loving this firmware so far, feels like a different scope! Should have my RTC in tomorrow, hopefully get it installed right away. I'm not sure if my favorite new feature is the battery level numeric display or the RTC...

Atlan · « **Reply #2711 on:** February 04, 2025, 09:31:41 am »

It is not very important that you have 4V, set the sensitivity to 500mV/div and 2V will be enough. It is important to set the voltage and sensitivity so that there is a DC shift. Bring the signal through a capacitor to the potentiometer and set the offset to 1V with it. Or use an operational amplifier that will provide a signal shift. Otherwise, icl3083 generator kits cost a few euros.

Cadstar70 · « **Reply #2712 on:** February 04, 2025, 11:11:00 pm »

OK, I think I will be more comfortable if I have an AWG I can trust. Certainly need one for my bench regardless. Found one of those cheap little Koolertron units they sell on Amazon open box from a private seller for $50 so that should do everything I need. The icl3083 based units look interesting for the price but I couldn't pass up the deal on a nice 15MHz Koolertron.

Cadstar70 · « **Reply #2713 on:** February 05, 2025, 08:06:36 pm »

Hey can I flash that new FNIRSI firmware without messing up my new V0.026c installation?

I did read that it didn't really fix anything but I would be interested in looking at it at least. I would just try it myself and find out but I'm still new to this scope and the past few days I have found it best to just ask when I can't find the answer in the thread myself.

pcprogrammer · « **Reply #2714 on:** February 06, 2025, 07:00:44 am »

Quote from: Cadstar70 on February 05, 2025, 08:06:36 pm

Hey can I flash that new FNIRSI firmware without messing up my new V0.026c installation?

It won't interfere with the V0.026c installation, but it might screw up things on the original side. There is the issue of different LCD and touch panels being used, so make sure to have the backups at hand you made with the backup program I wrote.

Cadstar70 · « **Reply #2715 on:** February 06, 2025, 08:49:05 pm »

I knew about the different LCD panels but I thought we could assume an official Fnirsi update would work on any Fnirsi branded device. If there is reason to doubt that I will just leave well enough alone.

pcprogrammer · « **Reply #2716 on:** February 07, 2025, 06:53:29 am »

Quote from: Cadstar70 on February 06, 2025, 08:49:05 pm

I knew about the different LCD panels but I thought we could assume an official Fnirsi update would work on any Fnirsi branded device. If there is reason to doubt that I will just leave well enough alone.

At some point in time FNIRSI had two firmwares for the 1013D on their download site. The only difference between the two was the timing settings for the display. Why there it only one version now I don't know, but doubt that they found a way to make it work without some special instructions to the user. For as far as I know there is no way to tell what the timing settings for a display are from within the hardware. You can't query these type of displays for any information. You can only write the pixel data within a defined frame setup. (Horizontal and vertical synchronization)

Cadstar70 · « **Reply #2717 on:** February 07, 2025, 07:24:48 pm »

That's very interesting, thanks for clear explanation. I'm really curious now to know if they posted something that may brick scopes. Too bad there is no changelog or explanation of some kind although I really am not surprised.

Got my Koolertron AWG today, turns out to be the 30MHz version. This thing is incredible compared to the little pico based one I built. DC shift no problem now.

pcprogrammer · « **Reply #2718 on:** February 07, 2025, 07:50:20 pm »

Quote from: Cadstar70 on February 07, 2025, 07:24:48 pm

I'm really curious now to know if they posted something that may brick scopes.

These scopes are reasonable robust and in case of FLASH problems easy to revive.

The hardware won't break with a "wrong" firmware. In case of the display the image is just shifted over some range of pixels in both horizontal and vertical directions. For the touch panel the orientation of where the touch is can be swapped or limited in both directions.

All fixable with the knowledge gathered in this thread.

The one remaining mystery in these scopes is what they used to make the "special ic". The 8 pin sop that is not used in the open source firmware because it is totally unnecessary for the functionality.

Atlan · « **Reply #2719 on:** February 07, 2025, 08:06:06 pm »

I've had 5x soldered flash for FPGA, so it's possible to brick it by programming flash for fpga. And there were times when the firmware had an error and it ended up freezing the firmware, and only completely erasing the SD card helped. No conveniences like now when in case of a problem you can run FEL or fnirsi and upload the repaired firmware

Cadstar70 · « **Reply #2720 on:** February 08, 2025, 12:50:26 am »

Quote from: pcprogrammer on February 07, 2025, 07:50:20 pm

All fixable with the knowledge gathered in this thread.

That's what I find odd about them posting a questionable update. It's not like there is a link this thread in the Fnirsi update document.

kd4e · « **Reply #2721 on:** February 14, 2025, 01:20:03 am »

I can't find it now but I read this in a Comment, somewhere online (I have it because I sent it to a friend)
statement about the 1013D

"... it says 2 channel, but ch2 is fixed at 200mv. hardly a real 2 ch scope."

Was this true of the early model or might it have been an operator error?

If accurate, has it been fixed (firmware and/or hardware) in the "Upgraded" model?

FNRSI Upgraded 1013D Plus 100X Probe, dual channel 100MHz bandwidth 1GS
sampling rate

Or in the custom firmware, please?

Thanks for all the work done to analyze and improve this instrument!

pcprogrammer · « **Reply #2722 on:** February 14, 2025, 06:21:59 am »

Quote from: kd4e on February 14, 2025, 01:20:03 am

"... it says 2 channel, but ch2 is fixed at 200mv. hardly a real 2 ch scope."

I have not seen this on the two I have. These are the ones with the BNC's backed into the housing. From what I have seen online in videos it did not come up either. The user interface provides buttons for both channels to select the sensitivity, so it does not make sense either.

The hardware also provides for setting the sensitivity for both channels, so in my opinion the statement is as false as can be.

It being a good scope is debatable, but it is a real 2 channel scope for sure.

kd4e · « **Reply #2723 on:** February 14, 2025, 02:12:18 pm »

OK, cool. I'll check that one off as False.

Sometimes Comments get posted on Amazon that are for a different device.

Thanks!

kd4e · « **Reply #2724 on:** February 14, 2025, 02:27:29 pm »

What about this one, please?

"the minimum voltage you can observe is 38 MilliVolts on the 50 mv range using the 1X probe. Or you can not observe any signal less than 380 mv with the 10X probe."

I take it that I'd notice this when trying to look at a microphone or audio and rf pre-amps?


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Author Topic: FNIRSI-1013D "100MHz" tablet oscilloscope (Read 932449 times)

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