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DSO-X 3014A: High Resolution Acquisition Mode?

Question asked by flanguasco on Jan 6, 2013
Latest reply on Feb 6, 2013 by flanguasco
On the oscilloscope Data Sheet is reported:

High Resolution Mode 12 bits of resolution when ≥10 μs/div at 4 GSa/s and 5 GSa/s (1 GHz models)
                                    or ≥20-μs/div at 2 GSa/s

and on the oscilloscope User's Guide, page 199, is written:
 
Displayed Sample Rate (sr, per channel, 2 Gsa/s max)...Bits of resolution
500 MSa/s < sr ≤ 2 Gsa/s................................................8
100 MSa/s < sr ≤ 500 MSa/s...........................................9
20 MSa/s < sr ≤ 100 MSa/s.............................................10
5 MSa/s < sr ≤ 20 MSa/s.................................................11
sr ≤ 5 MSa/s....................................................................12

From the Data Sheet I understand that for getting the 12 bits of resolution is enough to to have
a Time Base setting ≥20-μs/div at 2 GSa/s;
but from the User Manual it looks like the 12 bits resolution is available only when the 
Sample Rate is ≤ 5 MSa/s.

Obviously there is something that I don't understand and I would like to know how I have to
interpret the above reported specifications.

Ciao and many thanks in advance for any clarification on this matter.

Franco

Web: http://www.flanguasco.org  

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