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REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol

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marmad:

--- Quote from: EV on December 26, 2013, 11:43:29 am ---My old TEK TDS3032 has 2.5 GS/s and 5 samples per division with 1 ns time base. It is so regardlss whether both or only one channel is on.

--- End quote ---

But that doesn't make sense mathematically. If 2.5GSa/s is the maximum rate, 400ps is the smallest sample period. That would be 2.5 samples per div @ 1ns. 5 samples per div would require a 5GSa/s rate (200ps sample).

marmad:

--- Quote from: EV on December 26, 2013, 02:13:09 pm ---I do not know about the math, but look at the picture.

--- End quote ---

Math is math; there is no getting around it. Drawing dots on a display is something else.

Either one of the following HAS to be true:
1) Your DSO samples at a maximum of 2.5G and it gets a sample every 400ps - and then, for whatever reason, it's doubling the number of actual sample points it draws on the screen.
2) Your DSO, for whatever reason, has the 5GSa/s rate of the TDS3052, and it gets a sample every 200ps. Then the number of points on the screen equals the actual real sampling rate.

Carrington:

--- Quote from: marmad on December 26, 2013, 03:15:29 pm ---Math is math; there is no getting around it. Drawing dots on a display is something else.

Either one of the following HAS to be true:
1) Your DSO samples at a maximum of 2.5G and it gets a sample every 400ps - and then, for whatever reason, it's doubling the number of actual sample points it draws on the screen.
2) Your DSO, for whatever reason, has the 5GSa/s rate of the TDS3052, and it gets a sample every 200ps. Then the number of points on the screen equals the actual real sampling rate.

--- End quote ---
Maybe it's magic...

No seriously, as Marmad says: "Math is math".

Carrington:

--- Quote from: marmad on December 25, 2013, 07:33:43 pm ---Well, I guess it's technically a bug - but in an unimplemented - and perhaps unfinished? - portion of firmware. So not very relevant.

EDIT: BTW, does not happen when saving via RUU.

--- End quote ---
I agree is true, it is not relevant.
RUU -> Superb work.  :-+

EV:
OK, I have deleted my posts.


--- Quote from: Teneyes on December 26, 2013, 06:53:05 pm ---from Tek 3032B Manual
Separate Digitizers. Ensure accurate timing measurements with
separate digitizers for each channel. Each digitizer can sample at up
to the maximum sample rate (2.5GSa/s); acquisition on all channels is always
concurrent to provide full single-shot bandwidth on each channel.

So IMO, Tek is  combining samples from 2 channels,
if so Let's deleted all this dicussion, Please

--- End quote ---

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