Hi
Thanks for Your input...
As english is not my native language and it seems, that I like to complicate even simple things things, let my rephrase my question to make it hopefully bit more clear.
Well ..... I'm not at idea of substituting AudioPrecision System2 or R&S Audio System with 1500USD scope../ actually how AP2 cost, as everybody seems to recommend it.... I need to finally check that..
/
There is no denying that usually scopes ADC are 8bit and 10-12 bit high precisions modes are using kind of multi-sampling that comes at expense of speed on so on....
And finally I'm doing measurements with 24bit Audio Sound card and I know they can give pretty impressing results.. but with frequencies higher than 30-40kHz they start to just give up, and this is bit low for many situations and requires Laptop PC Software and some additional work around, so it is not convenient for quick measurements..
My question is how actually high precision scope mode works in real life... and specific in FFT , as this is possibly the only tool that can use it effectively, as seeing difference between 8 and 10 bit in time mode on usual scope screen is questionable.. .this is agreed.
OK..lets try these way...
My trusted old 8bit scope is able to show FFT down to -70dB but pretty big part is noise, so effectively it can be used to -60-65dB .
So going back to the "high precision" ... with 10 bit in theory we should get into -100dB region and with 12bit mode possible at new Rigols, at speeds lower than 5us, as I recently find out, we should be able to reach -110dB and this starts to be really interesting.../ well of cause if my dB calculations are OK /
But this is theory and I'm looking for real life info on it ....
Question is what can be REALLY seen at FFT's is there any more useful information, as possibly should be, any influence from memory depth, WFMS/S or any other scope parameters ??
So well any of You guys have any first hand experience regarding that nice looking features...from scopes marketing brochures....
Maybe Dave, could have a deep(!!) look at it with one of his scope reviews...??
Rosendorfer