Hi there I just wanted to your video is great. (Like Richards video which was good)  I really appreciate your honest opinions.

Like you, I have a FNIRSI 1014D oscilloscope with firmware 3. I also own a £500 touchscreen Rigol oscilloscope with lots of features, but I still use my 1014D for quick and accurate measurements.

I've now made mine fully portable by adding a built-in battery. Running it from the battery completely eliminates power supply noise, which is a nice bonus.
The way you explained the SMPSU was excellent. You're absolutely right that it's easy to damage an oscilloscope when measuring mains voltages on live equipment. However, with the isolated FNIRSI 1014D, that risk is greatly reduced.

Well done again, and please keep making honest videos. I can remember back in the 1980s in our Service Dept when an oscilloscope with far fewer features than our 1014D—such as an analogue Hameg—would cost hundreds of pounds. Those were the days! RCF

Thanks for the video pal. Very informative.

Bardzo pomocny materiał,  pozdrowienia z Polski

Does this scope have AC DC coupling as in other scopes to block DC component ?

Would an isolation transformer achieve the same as battery powered ?  (Minus the portability).

you have to explain first , floating ground, bridge configuration used into the amp output, thanks for a great effort !!

I find this information useful, thank you. How do I adjust the amplitude of the sinewave signal from the signal generator?

Hi, Can you please, explain to me shortly how to connect the amplifier to test the watt power? Thanks

The advantage this scope has is the easy adaptation of USB power block to make it fully floating. Now, the big and important issue in the audio world is Bode plots (Frequency measurements) using the built in generator. The FFT is very difficult to work out, no manual available, and a lot of "hidden" (non logic) setups for this to happen. Can you guide us through this?

I don't understand. You are saying the problem is that the probe is grounded to the chassis of the scope. Isn't that how all scopes are?

Thanks, just one thing that if we power it from a power bank, it will short the speaker -ve to ground, isn't it. Btw which scope is better for signal decoding and reverse engineering?

How do you get it to generate a signal?

Sir is it still working fine?

Would this be adequate for a tube amp ?

The Fnirsi 1014D does not have switchable DC/AC coupling on the input?  Why?  That's absolutely crazy.  Even a cheap $30 scope has AC coupling.

I just checked the manual and it does have AC coupling.  That would remove that 4V offset.  You need to learn when to use that.

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Unfortunaly it isnt a video, how to use it for absolute beginners....

Tam gdzie elektronika muszi byc Polak :hand-purple-blue-peace:

Nice toy for showing, not very suitable for work.  Sensitivity 100mV, range 30Mhz, 200MSa.  Pay extra and buy a Hantek - you can at least call it an oscilloscope.

FFT was not meant for sine waves. It is for square waves.