Products > Test Equipment

New toy(?) scope Fnirsi DPOX180H, claimed 180MHz/500MSps (May 2023)

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infino:
I don't understand your situation? Do you have the trigger set on channel one or channel two?
I emulated your situation and set all settings on the first channel and everything works without errors.


According to your screenshot, you have the sensitivity set to -5mv on channel 2,
and the oscilloscope probe is reacting to interference.
Either disconnect the probe or short the probe.

And 200mv is the setting in your first channel.

I would like Fnirsi to correct the information on the screen, if the second or first channel of the oscilloscope is off, it should not be displayed on the screen and not misleading.
In my example, the second channel of the oscilloscope is off in the menu and the screen shows its sensitivity as 5mv

csuhi17:
I tried the other settings a bit and uploaded the picture from CH2, I tried to see if the error was the same on both channels.
I made a video, although the focusing didn't work out, if it's not clear I can try to make a better recording.

Turn the volume down a bit, I didn't manage to record the button being pressed.
https://youtu.be/Yu_mY6qaujg

They behave a little differently, CH1 is denser while CH2 is less frequent.
If both channels are active, there was no error.

I also did the factory reset and then the calibration.


I changed the video link, the old one was of very poor quality.

battlecoder:

--- Quote from: csuhi17 on October 02, 2023, 02:29:05 am ---I tried the other settings a bit and uploaded the picture from CH2, I tried to see if the error was the same on both channels.
I made a video, although the focusing didn't work out, if it's not clear I can try to make a better recording.

Turn the volume down a bit, I didn't manage to record the button being pressed.
https://youtu.be/lXHz0NwcT0w

They behave a little differently, CH1 is denser while CH2 is less frequent.
If both channels are active, there was no error.

I also did the factory reset and then the calibration.

--- End quote ---
Couldn't replicate this, but I assume it's just picking up noise from the environment. If you are doing this near strong switch-mode DC supplies, LED strips or AC halogen lights try turning them off and see if it makes any difference. Normally oscilloscopes wouldn't pick up much noise without probes attached (which would them act like antennas) but I don't think this device has a lot of shielding other than the tin can covers on both channel inputs (which is honestly more shielding than I was expecting from a device like this).

Nik:
Found a way how to edit FNIRSI's custom wave that is used for scope generation. it is by drawing samples in an audio software and tweaking in hex editor due to a bug in audio editor :-DD

https://youtu.be/OiMUORkPghE

Below are screenshots before and after modification.

There upto 298 samples per capture that you can edit and then supply into Fnirsi DPOX180H back to use as output for its generator.
The format of samples is 8 bit. Low values corresponds to high amplitude. So to output max amplitude, draw waveform down. That is why the picture in audio editor looks mirrored vertically. Samples with values (low amplitude) will be clipped in output up to the values that shown on the screenshot below. It seems the very first 4 bytes in file are not samples as they have following format: 2 bytes is waveform number shown in built-in browser and the next 2 bytes is the length of waveform. I prefer to do not touch it as I am afraid it can broke or hang the scope. Sample number starting from 4 are the ones that safe to modify for the first Capture. I noticed that last sample in waveform is 0. Not sure does it go to generator to make waveform or used for other reason. All captures are stored in one file.

I tried to find its limit by output single sample at a highest frequency. Rise time is 20ns per volt.

I found that sometimes this audio software mess up with the file by incrementing every byte by one when it save file, including the metadata such as capture number and length of waveform making it useless. Sometimes it works fine. Not sure what cause issue. Sounds like an issue in that particular audio software. So final tweaks I made in hex editor, otherwise FNIRSI hangs upon opening captures browser.

How to modify:
- Capture some waveform with the scope
- connect scope to pc
- copy file Captures\data.cap to Captures.raw
- open the file Captures\data.raw with the audio software WavaPad as unsigned 8 bit raw data. That software accepts file extension raw, so before loading file needs to be renamed as .raw.
- Click on the draw button and draw by holding down the mouse button over waveform starting from sample number 4 upto the amount of samples written in bytes 3 and 4 (u16). There also audio effects, including filters and a form generator to have more fun.
- You will also see your previous captures there and be able to adjust them.
- When finish, save the file
- Open in hex editor to make a final tweak with data if necessary as audio software can mess up with indexes and frame length by incrementing data by 1.
- Rename back to data.cap.

Which waveform would be cool to see?

I also looked at the format of saved waveforms, the ones that creates by pressing SAVEW button. It seems 16 bit, 48k samples per file and can also be seen with the audio editor using the same technique. I guess audio data can be played, but might need some speed and pitch effect to be applied.

battlecoder:

--- Quote from: Nik on October 02, 2023, 04:32:16 am ---Found a way how to edit FNIRSI's custom wave in scope generator by drawing in an audio software  :-DD

--- End quote ---

--- Quote from: Nik on October 02, 2023, 04:32:16 am ---I also looked at the format of saved waveforms, the ones that creates by pressing SAVEW button. It seems 16 bit, 48k samples per file and can also be seen with the audio editor using the same technique. I guess audio data can be played, but might need some speed and pitch effect to be applied.

--- End quote ---
This is very useful information! We can totally make a waveform editor with this.
 :clap:

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