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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
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ebastler:

--- Quote from: Martin72 on November 25, 2023, 05:26:20 pm ---It's not the CPU, it's the same for all 12 bit models (6-core), the memory too.
I also have to say that I measured a significantly longer time on the 804 on the first start than on the subsequent starts.
Maybe the scope has something "up its sleeve".

--- End quote ---

The Rockchip CPU might be the same, I did not check the teardown videos. But didn't the DHO1000 and 4000 have a special chip for the boot disk (FORESEE brand or such), while the 800 and 900 switched to a regular SD card? Maybe there is a speed difference in these?

Alternatively, maybe the newer firmware in the 800/900 does additional stuff upon boot which takes more time, and which will show up in the 1000/4000 in a future firmware release. But they can't do much self-calibration there, with a scope that is not warmed up yet and has undefined signals at its inputs -- hence it seems unlikely that Rigol have found new ways to spend 15 extra seconds there.
Martin72:

--- Quote ---The Rockchip CPU might be the same
--- End quote ---

Is the same, FPGA is different.


--- Quote ---Maybe there is a speed difference in these?
--- End quote ---

That's right, the 1000/4000 don't have an SD card, that's probably why the 800/900 take longer to boot.
If you have to load content from the SD card, that's the bottleneck, as lame as the transfer from there is.
Svannie:
Hi, I'm on my way to buying my first oscilloscope. and the question is, will the HDO1074 be good for use on hifi audio equipment or is the HDO914s a better candidate with bode plot possibility ?
ebastler:

--- Quote from: Svannie on November 29, 2023, 05:27:05 am ---Hi, I'm on my way to buying my first oscilloscope. and the question is, will the HDO1074 be good for use on hifi audio equipment or is the HDO914s a better candidate with bode plot possibility ?

--- End quote ---

The DHO1000 series will give you even better resolution when needed, since it has 14 and 16 bit modes. (Using averaging/interpolation, at a reduced bandwidth, but certainly covering the audio range.) You could still use it for automated Bode plots, but would need to combine it with an external signal generator and a computer which runs a script to drive the generator & scope via SCPI commands -- awkward.

The DHO914s has everything in one package. You may already have found here on the forum that its Bode plotting capability is still faulty at this time (showing periodic amplitude wiggles which are not there), but I think it's fair to assume that Rigol will fix this soon via a firmware update. Whether you are comfortable with the smaller screen is a decision only you can make...

Specifically for HiFi audio work on a budget, you can also use a sound card for Bode plots -- and much more, like THD measurements. 24 bits instead of a measly 12 or 16! ;) There is various PC software around to use sound cards for these measurements. HPW Works is well-established but expensive; I personally like https://www.audiotester.de/, which has also been around for decades now and costs only 39€.

My personal preference would be a DHO1000 as a general measurement tool (with good resolution and a very nice big screen), and the AudioTester + decent USB-connected sound "card" for audio-range Bode plots, FFT, THD measurements etc.

Better make your mind up quickly regarding the DHO1000, since the 40% discount ends tomorrow...
TurboTom:

--- Quote from: Svannie on November 29, 2023, 05:27:05 am ---Hi, I'm on my way to buying my first oscilloscope. and the question is, will the HDO1074 be good for use on hifi audio equipment or is the HDO914s a better candidate with bode plot possibility ?

--- End quote ---

I had the chance to "play" with both the mentioned scopes. IMO, the HDO914S isn't a finished product yet, the bode plot function doesn't only produce erroneous results, it also lacks all kinds of features which make it appear to be a half-baked afterthought add-on. The HDO914 / 804 as an oscilloscope is a nice little gadget with basically all that one can whish for from an entry-level instrument. But...it's small and the reduced resolution (1024x600) screen together with the user interface that it inherited from it's larger siblings (DHO1000 / 4000) - (1280x800) makes the screen always look somewhat busy, especially when several windows are used. Rigol will probably get the initial problems sorted eventually, but how long that may take is unknown to us.

What I learned over time using chinese T&M gear is to never expect anything over and above of what you actually get upon purchase. Serious bugs usually get ironed out, and sometimes even add-ons or improvements are provided, but don't consider this for granted. Usually, the instruments selling in the highest numbers are better off while less common gear may get almost no update coverage, even for obvious bugs (Rigol M300 current measurement switching scheme).

Since I enjoyed the U/I and features of the DHO914S quite a lot, and with the unexpected black-friday offer for the DHO1074, I went for it and so far didn't regret it. It's so much more a "Real" scope than the 800/900 series. I also prefer not to have the additional USB PSU box laying around with its potential interference problems. As @ebastler told, bode plotting will require some work, but in all other details it's on-par or better than the 800/900 instruments. And what I really like: it doesn't have this stenching smell of "hot electronics" that the DHO914S emanated -- and that didn't appear to get any less while I had it for evaluation, which may be a real issue when you have your lab in a residential room.

So my recommendation is clear: If workbench space isn't a concern, get the DHO1074 at the "black friday discount", improve it to full DHO1204 capabilities with memory extension  (how to do this can be found here in the "hacking" thread) and use a work-around for bode plotting if you really need it.
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