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DSO Samplerates - From when they´re "enough" and why?
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nctnico:

--- Quote from: alm on January 19, 2023, 10:40:51 am ---Here's a logarithmic 100 Hz to 15 MHz sweep. Looks like a decent approximation within the limited screen resolution to me.

--- End quote ---
I wrote slow which means a long sweep over a small frequency span.
alm:

--- Quote from: markone on January 19, 2023, 12:13:37 pm ---I would say that nowadays those specs, only usable with equivalent time acquisition mode, are simply laughable.

--- End quote ---
Back then you could choose either sample rate (e.g. Tek TDS3000) or memory depth (Lecroy and HP). The former is better at short time bases, but all the extra sample rate is useless as soon as you go to slower time bases, because they don't have the memory depth to sustain their maximum sample rate. And the latter is not very useful at short time bases unless you can use equivalent time sampling, but is much better at longer time bases. Below 100 MHz those scopes should still be fine.

Of course these days you can easily get both.


--- Quote from: nctnico on January 19, 2023, 05:11:46 pm ---I wrote slow which means a long sweep over a small frequency span.

--- End quote ---
This is the worst I could get. Is this the reason you can't live without peak detect on deep memory scopes?
Fungus:

--- Quote from: Martin72 on January 17, 2023, 11:05:13 pm ---200Mhz and 200MSa/s, 500Mhz 500MSa/s, but also a model with 500Mhz and 1GSa/s.
I can not imagine that it was not enough at the time

--- End quote ---

It really wasn't...

(Maybe if you change the persistence to "infinite" and use dot mode)

How old are they? How much sample memory? How much did they cost?  :popcorn:

nctnico:

--- Quote from: alm on January 19, 2023, 05:50:07 pm ---
--- Quote from: nctnico on January 19, 2023, 05:11:46 pm ---I wrote slow which means a long sweep over a small frequency span.

--- End quote ---
This is the worst I could get. Is this the reason you can't live without peak detect on deep memory scopes?

--- End quote ---
It is not about peak detect but the decimation used by DSOs with deep memory can be fooled by some signals. You just didn't find the weak spot yet.
hpw:
My opinion(s) changed on that matter....

So the question is how many samples you like to have on a Rise/Fall edge... 5 or 10 or 20 samples?

At the end of the day, some Ferrari DSO is required as having RIS (LeCroy) on repetitive signal or than TEK for none repetitive.

I do not now know, how the new LeCroy has the repetitive signal limitation as using RIS.

On Siglent 2K+ did not found any RIS functions or I am missing something or may newer once as HD 2K or ??
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