EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review

[Martin.M]

Just for fun I´ve ordered one now, should arrive on monday. 

you got it from ware house Hamburg, germany.
They have send you also one where the charger is a NEMA type for us plugs? 

[Martin72]

Hi,

No...

[CChin254]

Block Diagram and IC Identification attached.

[1audio]

I'm planning on rewriting the firmware, adding more features like I2C or UART decoding, and maybe even giving access to a Linux desktop!

I'd need access to the winbond SPI flash contents. That's where the firmware is stored (U-Boot, Linux Kernel and app). If anyone can dump it and post it, it would be great. If not, I will have to wait until I receive mine.

Thanks!

Have you made any progress? I just ordered one to use as a waveform monitor. They claim FFT but no screenshots. I do home its in the firmware and reasonably useable. At least through Amazon the return is easy.

[Fungus]

They claim FFT but no screenshots. I do home its in the firmware and reasonably useable. At least through Amazon the return is easy.

It definitely has FFT.

https://youtu.be/EToBC3_FtOs?t=103

[1audio]

I received mine today. One day service from Amazon which was quite impressive. Its all working and looks to meet my needs- waveform display for outputs of a distortion analyzer. I found the FFT and its not particularly useful but at least its something. The autoset seems to work well for this.
I will check its response etc. soon. Of course the label on the front does not match the splash screen or what the Amazon listing indicated. I have not found a reference to a firmware rev level yet. However at this price I can't be too picky. Now I need to find new homes for two Tek scopes.

[Caliaxy]

I got one too. Looks nice and responsive at first glance, but it doesn’t seem to work as it should.

At the time it arrived I was playing with a new rotary encoder (optimizing the denouncing parameters in my code) and thought I should check what the pulses look like on the new little scope. I could not imagine a less demanding job to test it: trigger mode “Normal” on the falling edge, slow time base (2-50 ms/div), to assess the switching noise.

I noticed that at time bases longer than 10 ms/div, the green trigger threshold level and trigger x-position markers simply disappear off the screen and the trace does not seem to synchronize anymore (it still triggers). The only way to get the markers back (and have a stable wave on the screen) is by switching the time base back to 10 ms/div (or faster). The issue is easy to reproduce with a 20 Hz square wave in “Auto” or “Normal” trigger modes. Is this “normal” behavior for these scopes or is it mine particularly defective?

Also, as a bonus, the switching noise is almost gone when checked on this scope...