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| Siglent SDS1104X-E vs. Rigol DS1054Z Advice? |
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| Fungus:
--- Quote from: pascal_sweden on August 29, 2018, 07:55:52 am ---As a side question. How is the noise on the new Rigol DS7000 series? This is much lower han lower Rigol series and Siglent? --- End quote --- I'm not sure anybody has one yet (apart from Dave). |
| rf-loop:
--- Quote from: pascal_sweden on August 29, 2018, 07:55:52 am ---As a side question. How is the noise on the new Rigol DS7000 series? This is much lower han lower Rigol series and Siglent? --- End quote --- From Dave's video. This may give some preliminary idea before further tests (if we can see real professional grade tests and measurements or just entertainment show as usually - this we know later) Note that in this image there is BW limit on. I have not get any answer what is BW limit 20M, 100M or what? Also it looks like there is not much sample data on image...only 25k one wfm. If it is 20M... better that I do not say anything if it looks high or low... (need note that 1mV/div is magnified from 4mV/div what is most sensitive full resolution) |
| 2N3055:
--- Quote from: rf-loop on August 29, 2018, 03:29:09 pm ---Note that in this image there is BW limit on. I have not get any answer what is BW limit 20M, 100M or what? Also it looks like there is not much sample data on image...only 25k one wfm. If it is 20M... better that I do not say anything if it looks high or low... (need note that 1mV/div is magnified from 4mV/div what is most sensitive full resolution) --- End quote --- It has two settings : 20 MHz and 250MHz. But, unfortunately when making DS7000 they made it as bad as Keysight DSOX3000T, which also has 1 mV/DIVand 2 mV/DIV magnified in software from 4 mV/DIV, and pretty high noise. Both of those scopes are fast, but not low noise scopes. Actually, DS7000, in many ways is "inspired" by philosophy of Keysight DSOX 3000/4000 series: high wfms/sec, hardware decoding, etc etc.. Except they put much more memory on it... Low noise, high sensitivity input channels were not high on a priority list.. |
| Fungus:
--- Quote from: 2N3055 on August 29, 2018, 03:46:31 pm ---....Keysight DSOX3000T also has 1 mV/DIVand 2 mV/DIV magnified in software from 4 mV/DIV and pretty high noise. ... Low noise, high sensitivity input channels were not high on a priority list.. --- End quote --- Maybe it's simply not a problem for real work. Maybe it's mostly something for volt-nuts to obsess over in forums. Realistically, how much of a problem is <1mV of noise on (eg.) a 5V system? A 1V system? Even a lowly DS1054Z has a "high res" mode which will eliminate all random noise on a repetitive signal by averaging multiple waves together. Any noise you see in high res mode is in the signal, not in the 'scope. |
| nctnico:
--- Quote from: Fungus on August 29, 2018, 05:59:41 pm --- --- Quote from: 2N3055 on August 29, 2018, 03:46:31 pm ---....Keysight DSOX3000T also has 1 mV/DIVand 2 mV/DIV magnified in software from 4 mV/DIV and pretty high noise. ... Low noise, high sensitivity input channels were not high on a priority list.. --- End quote --- Maybe it's simply not a problem for real work. Maybe it's mostly something for volt-nuts to obsess over in forums. Realistically, how much of a problem is <1mV of noise on (eg.) a 5V system? A 1V system? Even a lowly DS1054Z has a "high res" mode which will eliminate all random noise on a repetitive signal by averaging multiple waves together. Any noise you see in high res mode is in the signal, not in the 'scope. --- End quote --- If you did any real work with an oscilloscope you'd know the answer: noise does matter because the noise doesn't get smaller when setting the input to a less sensitive setting. So it is easy to get a band of noise across the screen (I hated my Agilent DSO7104 for that even with BW limit on) which obscures the interesting part of a signal. Try to do accurate cursor measurements on a band of noise. Sure high-res mode can do some filtering but you get aliasing artefacts when zooming out and usually you can't use it together with peak detect so you miss other parts in a signal. All in all the less noise an oscilloscope has the more convenient it is to use. |
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