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Beginners / Re: Absolutely overwelmed by oscilliscope features & prices for a basic scope
« Last post by tggzzz on Yesterday at 11:55:57 pm »I have read the sampling rate should be 5x the MHZ.
The only important signal parameter is the transition time, since that determines the signal's bandwidth. FFI see https://entertaininghacks.wordpress.com/2018/05/08/digital-signal-integrity-and-bandwidth-signals-risetime-is-important-period-is-irrelevant/
In order to reconstruct the signal from the samples, there need to be at least two samples per period, e.g. a 10MHz signal needs at least 20MS/s. In practical scopes there needs to be at least 2.5 samples per period, i.e. 25MS/s for a 10MHz signal. For convenience, many scopes have much higher sampling rates (e.g. 10 samples per period) - but that does not change the signal's bandwidth-transition time relationship.