Products > Test Equipment
Rigol DS1000Z series buglist continued (latest: 00.04.04.04.03, 2019-05-30)
Njk:
--- Quote from: tautech on November 27, 2022, 01:40:51 pm --- :-//
Don’t these have a Exclusive FFT mode that doesn’t show the source waveform ?
--- End quote ---
No and that's the problem
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WBR
Njk:
--- Quote from: RoGeorge on November 27, 2022, 02:01:32 pm ---In fact, the FFT functionality in Rigol DS1054Z is unusable in practice. It works, but it's too cumbersome to operate the settings, too low resolution, and too slow to make any use of it, other than maybe a didactic demonstration.
--- End quote ---
It could be better but I'm trying to be positive. Some niche areas, e.g. education..
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WBR
Fungus:
--- Quote from: RoGeorge on November 27, 2022, 02:01:32 pm ---In fact, the FFT functionality in Rigol DS1054Z is unusable in practice. It works, but it's too cumbersome to operate the settings, too low resolution, and too slow to make any use of it, other than maybe a didactic demonstration.
--- End quote ---
It does work, but it takes a LOT of fiddling with the parameters.
Then if you change the timebase for a different signal you pretty much have to start over. >:(
The DS1054Z isn't the 'scope for you if FFT is something you use a lot. This has never been a secret.
Njk:
--- Quote from: Fungus on November 27, 2022, 02:42:21 pm ---It does work, but it takes a LOT of fiddling with the parameters.
--- End quote ---
I was of the same opinion, initially. But now I've to say that actually it's an efficient and elegant UI design, for given environmental constraints. I can't propose anything better (maybe the now popular touch screen technology provides more opportunities, but its advantages are offset by a scratched screen surface, dirty with fingerprints. Not everybody likes that). It's something like a scientific calculator, which uses stack-oriented input notation. Clumsy and inconvenient, but only to those without the idea. To all others, it's very convenient and super efficient.
What is really missing is the documentation. Every new user have to learn how it work. BTW the similar situation is in open source. Looks like the OSS guys are playing their game preventing the things from easy commercialization by competitors. But the Chinese are not dumb, they're thinking in they own way. Perhaps it's as difficult for them to explain something to a westerner, as it was for me to locate an affordable restaurant with casual European kitchen in Taipei. So omission is they favorite game as well.
Concerning the FFT function, the problem is how to configure the two numerical values, the frequency scale (Fscale) and the central frequency (Fc). The latter ranges from zero to the FFT sampling frequency divided by two. It's quite a bandwidth and if you want to achieve high precision and to avoid inconvenience and excessive mechanical wear, two tuning methods are requited, coarse and fine. But there are two controls in all, one is for Fscale and the other is for Fc. Instead of adding one more control, Rigol had decided to overload the existing controls with tuning method selection.
For each FFT sampling frequency, six Fscale values are available. Each Fscale value is associated with unique Fc increment/decrement (step) value. Consider 1 GSa/s sampling frequency as an example:
Fscale = 1 MHz -> Fc step is 20 kHz;
Fscale = 2.5 MHz -> Fc step is 50 kHz;
Fscale = 5 MHz -> Fc step is 100 kHz;
Fscale = 10 MHz -> Fc step is 200 kHz;
Fscale = 25 MHz -> Fc step is 500 kHz;
Fscale = 50 MHz -> Fc step is 1 MHz.
The Fc value can be set in the range of 500 MHz with 20 kHz precision. The procedure is as follows:
1. Select the highest Fscale value. Coincidentally, pressing the multi-function knob for Fscale does just that.
2. Tune close to desired Fc. That's coarse tuning.
3. Select the finest Fscale.
4. Tune exactly to desired Fc. That's fine tuning.
5. Finally, set Fscale at desired value.
That's it.
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WBR
Njk:
That's funny, my FFT experiments resulted in the scope's death. The RSoD syndrome. Definitely I'm not the first one. There is an advisory note of Aug 1, 2022 at the Rigol NA web site with the procedure the user is advised to follow in that case before service application. Did not worked. The Rigol FAE guy was confident that the problem will be easy to fix. Then he realized that in my case they have to order a replacement main board from China.
In the thread about MSO5000 the users reported that the scope is quite hot when operating. It was not like that, but I never took the unit apart to check how hot the parts are. So it might be a coincidence
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WBR
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