Products > Test Equipment
Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
Fungus:
--- Quote from: Martin72 on January 30, 2023, 09:22:35 pm ---Although...if batronix would lend me one....
--- End quote ---
Batronix said they wouldn't be selling them because Rigol won't let them so long as they're selling Siglents.
Let's check...
Nope. No HDO series on Batronix. >:(
2N3055:
--- Quote from: Fungus on January 30, 2023, 09:31:00 pm ---
--- Quote from: Martin72 on January 30, 2023, 09:22:35 pm ---Although...if batronix would lend me one....
--- End quote ---
Batronix said they wouldn't be selling them because Rigol wouldn't let them so long as they were selling Siglents.
Let's check...
Nope. No HDO series on Batronix. >:(
--- End quote ---
No DHO1000... They are selling 4000 tough... So weird....
Martin72:
Yep, DHO4000 is on sale, DHO1000 not.
And Conrad Electronic offers the DHO1000 for commercial customers only.... :-//
switchabl:
--- Quote from: gf on January 30, 2023, 08:47:50 pm ---The mirror reminds me on the array returned by Matlab's/Octave's fft() function. It contains DC and the positive frequency bins in the first half of the array, followed by Nyquist and the negative frequency bins. For a real-valued signal, plotting1) the log magnitude of this array shows a mirrored spectrum, as we are seeing it here. However, FFT on scopes usually does not display any negative frequencies, but hides them. I would not a priori overstate the bug -- it could be an easy to fix careless mistake in the software.
1) E.g. plot(20*log10(abs(fft(samples))))
--- End quote ---
I am not sure that the part to the right of fs/2 is actually a perfect mirror image. If you look at the second screenshot in https://www.eevblog.com/forum/testgear/rigol-hdo1000-and-hdo4000-12bit-oscilloscopes-launched-in-china/msg4668886/#msg4668886 the image seems to be a few dB down. Also in this case sampling rate is 200 kSa/s (acquistion) -> 256.41 kSa/S (FFT). That suggests an interpolation/resampling filter. In the next screenshot there is downsampling 2 GSa/s -> 25.64 MSa/s, which actually makes some sense to improve resolution at low frequencies.
Unlike the 2x upsampling case, that actually has potential for introducing less-obvious images < fs / 2. So here's hoping they got that right.
Fungus:
Remember that China is still in all sorts of lockdowns. It's easy to sit here saying they ought not to have released it and that they should be fixing it, but... we have no idea what's going on over there.
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