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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China

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Martin72:
First test weekend is over..
Summary so far:

Pros:

-Good building quality
-The display is bright and clear and has the same high resolution as the screens of the R&S RTB2000 series.
-New UI, mostly intuitive to use
-Good response of the touchscreen
-Mostly fast response/performance in general

Cons:

-Brutal loud fans
-No bode plot
-Meager FFT features
-FFT is buggy
-No dot mode
-No deactivating sin(x)/x possible
-No complete screenshot possible (except via webserver)
-Auto memory mode not on all acquisiton modes avaible
-In average mode only max. 10M memory

Next things I´ll test are the decoder functions and I want to test the ultra acquire mode somehow to get an idea for what´s in real good for(there are a lot of limitations(refer to the manual) when this mode is active)
Further waveform update rate, just for curiosity.

mawyatt:
Martin72,

Thanks for the testing. Any chance you could run a two tone IMD test on the Rigol and Siglent HD DSO for comparisons? Think you have a SDG2042X, so you could use the Waveform Combine feature. Maybe just 10KHz and 11KHz at 1VPP if you have the time.

Best,

Martin72:
Hi,

Yes will do, maybe tomorrow, no problem.
The rigol can remain here for another 10 days before I have to send it away again.
We can play around with it until then, but I will have the most time for it again next weekend.
I will do the two-tone test earlier.

TomKatt:
I'm not nearly smart enough to fully understand all this, but I always thought sin(x)/x was some kind of 'approximation' that restored curvature to the sample data.

According to this Agilent brief, sinx(x)/x can create an identical waveform as seen by the input...

https://siglent.fi/data/technical-common/Sin%28x%29x_Agilent.pdf


--- Quote from: Siglent ---Digitizing real-time oscilloscopes provide the backbone of high speed time-domain measurements made in the
industry today. Modern oscilloscopes use high-speed digitizers to capture the input signal. An oscilloscope’s
sample rate is often touted as a banner specification for the instrument; higher being better. In reality, as long
as the rules of Nyquist are not violated, an oscilloscope can reconstruct a user’s signal identically. This
reconstruction process is often referred to as sin(x)/x interpolation. Whether the sample rate is 25x the Nyquist
frequency, or 2.5x the Nyquist frequency, interpolation can be used to reproduce the waveform exactly as it
appeared at the oscilloscopes input connector, removing all doubt about a signal’s behaviour between samples.
--- End quote ---

Kleinstein:
The sin(x)/x interpolation gives the interpolation that has no signal in the higher Nyquist regions. So it would be the true signal after a brickwall filter at fs/2.
There is just no information what high frequencies could be there - so assuming no high frequencies is OK.

It can still help to just see the dots and no interpolation at all.

The simple linear interpolation is more a thing for faster drawing and no other real advanatge. So one can well live without that option if the scope is fast enough with sin(x)/x.

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