Rigol DS1052E- How many FFT points

[Flavour Flave]

Actually it is the upgraded DS1102E thanks to you guys  
Anyway, does anyone know how many points the Rigol DS1102E FFT function uses? Because I want to work out the FFT noise floor. Couldn't find it in any of the documentation.
Thanks

Just needed to know because I was reading this Analog Devices tutorial here http://www.analog.com/static/imported-files/tutorials/MT-001.pdf

[pfm]

bump.
seeking the same info (number of FFT points) for this Rigol series and can't seem to find it anywhere and found this thread while searching for it. Hoping someone knows and will post here.
Thanks.

[Bored@Work]

Typically, in such simple oscilloscopes the manufacturers just use enough data points to fill the screen. Because of the negative frequencies and the symmetry, this means using twice as many data points (ok, in theory (W - 1)/2) as input to the FFT as the screen is wide.

[slateraptor]

...this means using twice as many data points (ok, in theory (W - 1)/2) as input to the FFT as the screen is wide.

Probably less if their engineers optimized for bezel thickness, e.g. (<total horizontal pixels> - <horizontal bezel pixels>) buckets...viz. information limit is dictated by screen resolution, so it wouldn't make sense to have more buckets than horizontal pixels...unless the number of buckets is base-2 or coprime factorable.

[pfm]

called Rigol, its 600 points. Its kind of eluded to in the "programming guide" as well.
Hope this helps anyone looking for this info.

[slateraptor]

called Rigol, its 600 points. Its kind of eluded to in the "programming guide" as well.
Hope this helps anyone looking for this info.

600 buckets is a curious choice. *shrug*

[IanB]

called Rigol, its 600 points. Its kind of eluded to in the "programming guide" as well.
Hope this helps anyone looking for this info.

I guess the information had been alluding you, then? 

[pfm]

correct 
but I guess I can say I do pretty well for English being my 2nd, or rather make that 3rd language...

[pfm]

does 2) apply to the onboard fft as well ? I got the impression its 600 regardless.
for external fft(using 3rd party programs) it would ofcourse be limited by the current memory depth.

[kusanagi]

'600 points' is curious for FFT process.
If it is so, that is DFT, not FFT.

I checked the manual of Agilent DS1k series, which are brother products of Rigol's.
It clearly states 'Fixed at 1024 points'.
But Rigol says nothing.

If it is 1024-point process, how does it map points to output?
FFT waveform actually occupies 10divs with DS1052E.
Number of pixels for 10div is 250 points.
This is another question.

[slateraptor]

'600 points' is curious for FFT process.
If it is so, that is DFT, not FFT.

I'm more inclined to suspect that the supposed 600 buckets is a misinformed fib rather than a DFT implementation, even if this information is reported from Rigol. Unfortunately, I don't think there's really any way to validate the claim shy of direct firmware disassembly and inspection.

[slateraptor]

I'm not even going to try...