Author Topic: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review  (Read 12701 times)

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Offline Martin.M

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #50 on: September 27, 2020, 12:13:00 pm »
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?  ;)

[attachimg=1]
« Last Edit: September 27, 2020, 12:18:48 pm by Martin.M »
 

Offline Martin72

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #51 on: September 27, 2020, 07:00:22 pm »
Hi,

No... ;)

Offline CChin254

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #52 on: September 29, 2020, 11:14:56 pm »
Block Diagram and IC Identification attached.
 

Offline 1audio

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #53 on: October 05, 2020, 02:47:26 am »
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.
 

Offline Fungus

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #54 on: October 05, 2020, 03:56:10 am »
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
 

Offline 1audio

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #55 on: October 05, 2020, 10:32:45 pm »
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.
 

Offline Caliaxy

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Re: EEVblog #1317 - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
« Reply #56 on: May 12, 2021, 07:27:35 pm »
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...
 


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