Products > Test Equipment
Zooming *IN* [actually: signal reconstruction]
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tautech:

--- Quote from: Fungus on October 21, 2022, 06:50:37 pm ---
--- Quote from: tautech on October 21, 2022, 06:29:46 pm ---
--- Quote from: DavidAlfa on October 21, 2022, 06:20:58 pm ---How in earth is this dangerous? Innacurate, yes.

--- End quote ---
Youtuber clickbaiters just don't care, they only want views.

--- End quote ---

Relax, this one wasn't an anti-Siglent video.

--- End quote ---
FFS Fungus, that's kids stuff. Maybe you need get a RF gen and find this stuff out for yourself.
balnazzar:

--- Quote from: Fungus on October 21, 2022, 06:53:46 pm ---
Dangerous not in physical sense, of course. I poses a danger to measurements, up to the point that you see a completely different signal. That's a bit worse than just inaccurate.

--- End quote ---

This is where (eg.) the Rigol MSO5000s 8GHz sample rate is a big advantage. It's 6x Nyquist where most scopes aim for 2.5x.

It's not always about "noise". Other numbers matter, too.
[/quote]

True.

...But if it had been just a bit less noisy...  ;D
bdunham7:

--- Quote from: Fungus on October 21, 2022, 06:53:46 pm ---This is where (eg.) the Rigol MSO5000s 8GHz sample rate is a big advantage. It's 6x Nyquist where most scopes aim for 2.5x.

It's not always about "noise". Other numbers matter, too.

--- End quote ---

Sure, it's probably better if you happen to need a solid response to 350MHz on more than two channels at once. 
Bud:

--- Quote from: balnazzar on October 21, 2022, 05:43:12 pm ---Nyquist’s most famous theoremproposes that a signal can be reconstructed perfectly from discrete samples if the following two rules are observed:
1. The highest frequency component sampled must be less than half the sampling frequency and
2. Samples must be acquired in equally spaced intervals

--- End quote ---
There is a flaw in this statement because it gives no guidellines as to how low the amplitude of a high frequency component is considered practically sufficient for satisfactory visual reproduction of the waveform on the oscilloscope screen. Based on the  rules quoted above, a 20GHz s scope would not be able to perfectly reconstruct my 1kHz square wave because the spectrum of my square wave is infinite.
tautech:

--- Quote from: Fungus on October 21, 2022, 06:53:46 pm ---
--- Quote from: balnazzar on October 21, 2022, 06:50:06 pm ---
--- Quote from: DavidAlfa on October 21, 2022, 06:20:58 pm ---How in earth is this dangerous? Innacurate, yes.

--- End quote ---

Dangerous not in physical sense, of course. I poses a danger to measurements, up to the point that you see a completely different signal. That's a bit worse than just inaccurate.

--- End quote ---

This is where (eg.) the Rigol MSO5000s 8GHz sample rate is a big advantage. It's 6x Nyquist where most scopes aim for 2.5x.

It's not always about "noise". Other numbers matter, too.

--- End quote ---
They do.
Turn on all 4 channels and look what happens to your 8GSa/s.
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