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| Siglent SDS1104X-E vs. Rigol DS1054Z Advice? |
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| JS:
--- 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 --- High res doesn't do that, average does... In average you can program the number of captures to average. High res uses oversampling or a moving average. In both cases it will filter out the input noise as well as the random noise from your source which you might want to look at. Also, you can't use average for single shot capture. Lower sensitivity ranges only differ in not being digitally amplified, so only the first ranges, which are zoom of a higher range gets higher noise, then the noise stays pretty much the same, could change a bit depending on the gain of each stage but can even get higher at some point where the Eon dominates over Ein. You could use a preamp to go to the lowest ranges and keep the noise as the others, but you can't get very much from them, and they are kind of a pain, expensive if you buy one or hard to build properly. I don't know why scopes don't have other filtering options, if you want to look at an audio signal a 100kHz BW limit could do a lot of good and implementing this in SW could be quite nice. Having one filter or two per decade would be great. High res does something like this but as I said it's not very straight forward knowing what it's doing, and as you don't know you don't know what it could be doing behind, it will change the response as you change the horizontal scale. With math you also can do something like that but it's not great, sone times helps to have a better look at the signal but doesn't quite cut it. JS |
| 2N3055:
--- 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 --- It depends on what you do.. If you work with analog, low level sensors, power supply stuff.. Yes, than it might be important. I agree that for general work you might not need it. And yes. Hires mode helps a lot. It will also reduce effective sampling frequency for same factor. So you end up with a 5 MHz scope. Real low noise and sensitivity with full bandwith cannot be replaced sometimes. I have a real 12 bit scope and it is amazing what detail can you see sometimes... Point is, I wasn't criticizing, quite the opposite. Many people swear by Keysight DSOX3000T series as "best scope to use" and it has same input sensitivity specs as ds7000. So it might not be important to many people out there. Many people need good MSO for their mixed signal work, not for low level analog stuff. |
| nctnico:
--- Quote from: JS on August 29, 2018, 09:48:39 pm ---I don't know why scopes don't have other filtering options, if you want to look at an audio signal a 100kHz BW limit could do a lot of good and implementing this in SW could be quite nice. --- End quote --- GW Instek and MicSig oscilloscopes have freely settable filters (low-pass, high-pass and band-pass) so it already exists and these are very useful for some purposes. Not just for audio but try looking at a signal with a noisy DC-DC converter nearby. |
| KungFuJosh:
I'm reading the manual for the Siglent while I'm waiting for it to arrive. A couple things I noticed I like better already. For example, on the Rigol, to set the scope to default you have to press Storage, and then press Default on the soft buttons. On the Siglent it's a single "Default" button in a good spot. That works well for me. One thing I think is stupid that the Siglent shows in the manual: "Curr means the current memory depth." Why wouldn't they just write Mem? Cur means a crappy dog. Is that what they want their scopes associated with? Crappy dogs? :palm: |
| tautech:
--- Quote from: KungFuJosh on August 30, 2018, 01:03:08 am ---I'm reading the manual for the Siglent while I'm waiting for it to arrive. A couple things I noticed I like better already. For example, on the Rigol, to set the scope to default you have to press Storage, and then press Default on the soft buttons. On the Siglent it's a single "Default" button in a good spot. That works well for me. --- End quote --- Have a study up on User definable Default, a very useful feature. ;) --- Quote ---One thing I think is stupid that the Siglent shows in the manual: "Curr means the current memory depth." Why wouldn't they just write Mem? Cur means a crappy dog. Is that what they want their scopes associated with? Crappy dogs? :palm: --- End quote --- Page # ? Please offer a suggested manual edit ? |
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