| 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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