FNIRSI-1013D "100MHz" tablet oscilloscope

[Atlan]

https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/3200/

[TriNitron]

I'm starting to think it's impossible to achieve stable measurements without hardware modifications. Maybe the quartz crystal needs to be replaced with a femto-clock or something else. But signal instability is the main problem with this model. If it's not addressed, the rest is pointless.

[engineer.r152]

2 problems were found
1. it was not possible to fully correct the frequency measurement, with a decrease in the scan time from 10 kHz, the frequency became 55.3 kHz
2. there was a problem before, but only now I was able to figure it out, the cursor of the first channel starts moving from the cursor position of the second channel when the second channel is turned off, if the channel is turned on then everything works correctly, the second channel works correctly anyway.
Both problems are presented in the video.
https://rutube.ru/shorts/1ddb197dc822ff16acd40a27dd8636fd/
https://rutube.ru/shorts/c0a5ddd2c4ace965236fe72eff7d754a/

[Atlan]

The error in the touch control has been fixed, as well as anything else that was there. It's more complicated for me with the measurements. I'll fix it later.

[ded]

Hi @Atlan, I think I've the right board with the AL3.
Can you confirm this?

[Atlan]

But this is the first version, with protruding connectors and there may be an EP4 altera But I guess when ALTERS were there, they didn't have their numbers deleted?
As always, you do everything at your own risk.

[pcprogrammer]

Hi @Atlan, I think I've the right board with the AL3.
Can you confirm this?

Yes this looks like an AL3 board. On the Altera based one I have, the IC's markings are not removed and clearly show it is an Altera FPGA.

A simple check is to extract the content of the FLASH near the FPGA and compare it with the bit stream for an AL3 based one. The header part shows the FPGA ID.

[gadak222]

Hello,What is the purpose of the black converter in the photo above, which is soldered to a linear voltage stabilizer?

[ded]

Hello,What is the purpose of the black converter in the photo above, which is soldered to a linear voltage stabilizer?

This is a step up voltage regulator. The base voltage changes as the battery voltage decreases. This step up stabilizes the base voltage. Atlan already described this a few pages ago. I hope I've explained it correctly; otherwise, please correct me.

[ded]

A simple check is to extract the content of the FLASH near the FPGA and compare it with the bit stream for an AL3 based one. The header part shows the FPGA ID.

@PCProgramner, @Atlan
Many thanks for the answer and your great work with the 1013D.

How can I ready the Flash? Must I be desolder the Chip or can I read it directly on the board?
I've order a CH341 Programmer.

[Atlan]

If you use updater 0.02v. It has reduced options. Just unsolder SPI flash near SD card. Solder 4 wires to the connector of spi flash which is for FPGA. If you run updater 0.02v there will be active button DOWNLOAD (firmware fnirsi section), it will allow downloading content from spi flash for FPGA to sd card of oscilloscope. [ so just upload this DOWNLOADED file to forum.] (at the same time it will allow re-uploading of original fpga flash via UPLOAD button)

The Firmware PECO section is used to upload alternative FPGA firmware.

[ded]

If you use updater 0.02v. It has reduced options. Just unsolder SPI flash near SD card. Solder 4 wires to the connector of spi flash which is for FPGA. If you run updater 0.02v there will be active button DOWNLOAD (firmware fnirsi section), it will allow downloading content from spi flash for FPGA to sd card of oscilloscope. [ so just upload this DOWNLOADED file to forum.] (at the same time it will allow re-uploading of original fpga flash via UPLOAD button)

The Firmware PECO section is used to upload alternative FPGA firmware.

Thanks, I'm familiar with that, but I misunderstood. I thought the FPGA had to be programmed with your version beforehand.

[TriNitron]

Atlan, could you please tell me what versions are currently stable for the EFL2 version of the board?
Bootloader?
Updater?

I recently had a black screen when turning on v0.27u. And when selecting the Fnirsi OS, the waveform window interface and meters froze.

Perhaps the problem is a poor-quality stock SD card...
Or maybe there's some conflict between the bootloader version and the EFL2 chip.

I have a second 30GB Samsung SD card, and it had firmware v.0.26.y, along with earlier versions of the bootloader and updater.
I'm using it for now.

I want to make an SD card with all the stable versions of the components, so this doesn't happen at an inopportune moment, somewhere away from home.

And please tell me, if I enable Average Mode, the signal stabilizes. Can I see the jitter of the actual input signal in this mode, or will it be smoothed out? How much will it be smoothed out?

[pcprogrammer]

How can I ready the Flash? Must I be desolder the Chip or can I read it directly on the board?
I've order a CH341 Programmer.

Both are possible, but be aware with the CH341 programmer it might not allow setting the signals to 3.3V and damage your scope due to 5V on the signals. Search the forum on the CH341 Programmer to get more info on this.

The FPGA flash chip can be read in circuit, but make sure the FPGA is up and running before connecting to the FLASH. Do not use the programmers supply to power the FLASH. Let it be supplied by the scope.

Atlans solution will also work, but you have to modify your scope for this.

In your version one of the empty headers is for the FPGA FLASH.

[Atlan]

Atlan, could you please tell me what versions are currently stable for the EFL2 version of the board?
Bootloader?
Updater?

I recently had a black screen when turning on v0.27u. And when selecting the Fnirsi OS, the waveform window interface and meters froze.

Perhaps the problem is a poor-quality stock SD card...
Or maybe there's some conflict between the bootloader version and the EFL2 chip.

I have a second 30GB Samsung SD card, and it had firmware v.0.26.y, along with earlier versions of the bootloader and updater.
I'm using it for now.

I want to make an SD card with all the stable versions of the components, so this doesn't happen at an inopportune moment, somewhere away from home.

And please tell me, if I enable Average Mode, the signal stabilizes. Can I see the jitter of the actual input signal in this mode, or will it be smoothed out? How much will it be smoothed out?

Use bootloader v0.7 it checks for FPGA presence. Bottloader 0.8 just waits a while and goes on, which can cause problems. It is only intended for alternative fpga firmware, I will modify it when I have time.

But. I think the problem is somewhere else. Especially when running fnirsi, flash spi is used, so it shouldn't freeze even with a bad card, but with fnirsi you never know.

[Atlan]

1.00n8 fix for frequency measurement and time-, time + to 50Msa. Try it, I hope it will be OK.

Other errors?

[engineer.r152]

I found one error, at 9000, 12000 and 15000 samples, when you pause the signal at the end of the waveform, when the time scale decreases, it becomes with a broken tail of data, can it be cut off somehow?
Measurements are now accurate in all modes!

[Atlan]

That's a rounding thing, Sample Memory has 16380 samples, and in principle you shouldn't go all the way to the end. So you shouldn't see it. That's just an aesthetic flaw, maybe I'll fix it someday.

[Atlan]

fw 1.00n9 Modified LINEAR plotting function, previously data skipping occurred. CH1 modified function, ch2 original plotting function.
 I think it is clear to everyone what problem the original function can cause.

The video also shows why it is good to have more sample memory available, it is possible to increase the sampling frequency from 5MSa to 50Msa and thus see more in the signal.



P.S. I see that you don't use those oscilloscopes very much, because no one reported that changing the display mode on ch2 doesn't work.

[Atlan]

Why use alternative firmware?

[Russell2024UK]

Hello Atlan  IVE Found the new bootloader v.08.bin & updater v0.02v.bin & dso firmware v1.00n3.bin

Its in your Zip file thank you found as per picture ...

Thanks PS merry Christmas.. 

[Atlan]

Try it, 3000 samples and 50% trigger occurred.

[Russell2024UK]

Hi Atlan I’ve updated to 1.00n6, updater v0.2v, and boot loader v0.8, but I’m not sure what I might have missed or need to do next.

A “failed to open” screen appears, See attached pictures for reference.

Can you help? Thanks.

[Atlan]

It would start in. Reading manual on github (you're wrong, the image on the SD card doesn't really matter) and you don't have a calibrated oscilloscope to restore from a backup on your PC

[Russell2024UK]

Thanks for the update. 

I’ve restored my backup calibration using the 1.1.3 software via USB connection from laptop in the Calibration Tab. Does this look correct now, or is there anything else I should do? Thanks again 

In 2026 i will have more time regards FPGA help etc