FNIRSI-1013D "100MHz" tablet oscilloscope

[Atlan]

As for the TRIGGER, the original programmer was trying to avoid the imperfection of the flood trigger.
The result is a more stable trigger at high frequencies, but the signal jumps up and down

(all problems are caused by the stupid design of the input and ad converters, and interference with the power supply)

try here is another trigger

[Atlan]

I want some feedback on the filtering and the other trigger. well thank you

[pcprogrammer]

The largest part of the trigger handling is done in the FPGA, and it is basically crap. Since it is done on the samples taken it is bound to the sampling rate and won't catch narrow pulses on longer time bases settings.

I did not implement any filtering in my version of the firmware, but if you want to know more about the original firmware filter setup start reading the posts from here on

That is where I found the code they used to do what they do and it is quite inefficient. Spend quite some time on figuring it out and then dumped it and decided to go without filtering first.

[Atlan]

The filtering is not very important, too much filtering will create a nice picture that has nothing in common with reality.
The filter is only because the whole design of it is bad.
And also because there is such a possibility.  Worse is the bouncing trigger at higher frequencies or sampling

[illiac4]

I have tried both firmwares and both shows the same behavior. On original when I do the test measure  on the back of the oscilloscope the 1khz option the wave is shown. Also there is a clear view of the screen.
On both non original firmwares only one tiny violet line is shown when 1khz test is connected. And screen shows on the yellow tumbs brighter horizontal spots.

[Atlan]

I have tried both firmwares and both shows the same behavior. On original when I do the test measure  on the back of the oscilloscope the 1khz option the wave is shown. Also there is a clear view of the screen.
On both non original firmwares only one tiny violet line is shown when 1khz test is connected. And screen shows on the yellow tumbs brighter horizontal spots.

Please pictures, thank

[illiac4]

Here they are.

[Atlan]

Turn OFF mode X-Y

[illiac4]

Oh. TNX. What about the colors of the screen?

[Atlan]

And screen shows on the yellow tumbs brighter horizontal spots.
fix in firmware 0.019g
This is a question for the flood programmer. I can see a yellow wavefrom on yellow background.

1. Edit Trigger for higher frequencies, and cancel the correction I gave there.
2. 50% TRIGGER to change to calculate it to set it real to 50%
3. Off Move (Tracks) If the channel is turned off.
4. Switching the Sampling Frequency-Repair at WaveFrom Thumbnail

RMS I still didn't look around.

[Atlan]

I started work to integrate RTC DS3231. It will be contributed as a Case and Date Setting menu. And find out if this information can be written to the file. This will require extensive code adjustments. Hardware should not be a problem. Fit 4 wires for large area of 0805 components.

It would not be able to change the file name by date-time and omit the change of file attributes, what do you ?

I will remove the errors described by the bug. Soon a new firmware - modified trigger. I hope it will be good.

[Atlan]

Can someone explain to me the reason why they did not use an analog trigger with a comparator?

[pcprogrammer]

Can someone explain to me the reason why they did not use an analog trigger with a comparator?

Who knows? Money, incompetence, inexperience, etc.

[Atlan]

It is possible when they didn't even give the RTC for 1E.  I have the feeling that they designed it in the simulator and then had it manufactured.  Without any tests.
The whole design looks like it was made by students.

[Atlan]

So if you have time to have fun. the color of the H trigger varies depending on whether the trigger trigger value is found in the samples. red trigger not found - the middle of the buffer of samples is used. green trigger value found (+- 2 bits)

To give you an idea of how "well" a digital trigger based on an AD converter works.

I think there's no point in looking for the trigger value in the samples. in the case of a rectangular course, there is nowhere. you just have to think that it is always in the middle of the sample.

[Atlan]

Version for use: v0.015
Trigger location, fixed in the center of the sample. (real center-4)

[Atlan]

So adding RTC to use the file name in date and time format, maybe I will also leave the serial number.

Is anyone thinking about installing the RTC there?



Even if I don't announce, I constantly remove errors found.  And I added a couple of them too

[Atlan]

I see 15 downloads the last version. Is there a trigger better? Signal less jumps up down?

[Alex62]

Yes. Up down got better. What can not be said about the horizontal, especially less than 100ns.
Thanks for the work.

[Atlan]

Triangle square  sine? Triger 50%? One or 2 period on displej. Pls upload video.

Do you have a lipo to 5V converter installed?  The used linear stabilizer requires a minimum input voltage of 4.3V.  (good idea to power it from a 4.2V battery that is discharging)

[Alex62]

Video without DC-DC at 5 volts.
I put DC-DC on 5 volts - only the interference increased.

[Atlan]

So you have to write it in FNIRSI, because if the captured sample contains the numbers 78,82,77,81 and the trigger is set to 80, it is difficult to find out where the trigger is. That's how a digital trigger works.
Maybe after collecting 10 samples and averaging them, I believe that the signal will be clean, but unrealistic.

The AD converter picks up interference and this has a big impact on the result.

[Atlan]

So the files already have a time and date stamp. 

It is worse with the display of date and time in the thumbnail oscilloscope, the flood programmer took it quite comprehensively and included the path to the file in the name.  Which complicates things quite a bit.

[Atlan]

Fixed error, channel 1 axis could not be moved after autoset, If channel 2 is off.

[Atlan]

Assembly of the RTC module.



It is necessary to program the menu to set the time and date.