Products > Test Equipment

Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China

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tv84:

--- Quote from: gf on January 30, 2023, 02:41:06 pm ---The FFT trace looks horizontally mirrored at 100kHz, even the noise seems mirrored. Strange.

--- End quote ---

I would bet it is mirrored! That should say something to those who know this stuff.

Fungus:

--- Quote from: tv84 on January 30, 2023, 05:00:19 pm ---
--- Quote from: gf on January 30, 2023, 02:41:06 pm ---The FFT trace looks horizontally mirrored at 100kHz, even the noise seems mirrored. Strange.

--- End quote ---

I would bet it is mirrored! That should say something to those who know this stuff.

--- End quote ---

Yep. See video three posts up ^^^

tv84:

--- Quote from: Fungus on January 30, 2023, 05:02:20 pm ---Yep. See video three posts up ^^^

--- End quote ---

Sorry, I spoke too soon. Then I saw the rest of the posts.

Shouldn't the FFT stop at 100kHz if you have the 200kSa/s ? That would solve the picture at 200 kSa/s and save Rigol's honor.  :)

But then, why does the 400kSa/s show the same mirroring?  :palm: 

These are the moments where you need an engineer next to the GUI programmers or in the betatesters group...

I wonder how such a bug passed the FFT QC tests?!?  :-//

rf-loop:

--- Quote from: Fungus on January 30, 2023, 04:44:29 pm ---Question: What happens if the input signal is 99.5kHz?

--- End quote ---

You can't deduce that from the data you've received so far.  I'm not surprised - for some reason.

Fungus:

--- Quote from: rf-loop on January 30, 2023, 05:19:46 pm ---
--- Quote from: Fungus on January 30, 2023, 04:44:29 pm ---Question: What happens if the input signal is 99.5kHz?

--- End quote ---
You can't deduce that from the data you've received so far.  I'm not surprised - for some reason.

--- End quote ---

I've been told I'm not allowed to deduce anything from forum posts or screen grabs.

I thought I'd ask a simple, direct question instead.

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