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| buy a better oscilloscope than the Siglent SDS1104X-E |
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| uargo:
--- Quote from: 2N3055 on August 16, 2023, 11:38:29 am --- --- Quote from: Fungus on August 16, 2023, 09:54:20 am --- --- Quote from: Performa01 on August 16, 2023, 08:03:35 am ---Here also ... have you ever tested one? If so, why not show us the results, so everyone can see this "perfect capability" with their own eyes? I do not doubt that it can do it, but seeing is believing... --- End quote --- Dave's video was about pretty much nothing other than noise measurement: --- End quote --- Errm... it is not? As I said before, it seems Rigol uses decent ADC this time. And it seems to be (very?) decent noise levels, hardware vise. But that is hardware "promise". With half baked FFT and unfinished software not there yet. Problem in the real world is that measuring microvolt levels is not easy, and it is questionable if OP can make setup that will be better than the scope he has now... As Nico says, probing, grounding, shielding etc is critical here. It is unclear (even to OP) what he really needs. Saying "600 uV levels on power supply" without stating is it RMS or P-P or what BW is not really clear requirement. Also depending as to what this power rail is for maybe such low noise/ripple levels are not needed at all, i.e. devices powered also have it's own PSRR that might be sufficient for power not to be critical at all... --- End quote --- 600uVpp, I use a 2.5vdc CJ431 (Chinese TL431) voltage reference and the 12-bit adc from an STM32F401RCT6, so 2.5vdc/4096 steps = 0.0006v each step. but there is noise that I would like to reduce. and if I use a digital filter. The source consists of: 1 - 12vdc input 2 - 12vdc input, dc-dc source with a Tps54331 and 5vdc output 3 - 5vdc input, linear source with Ams1117-3.3 with 3.3v output STM32F401RCT6 and Cj431 voltage reference at 2.5v powered at 3.3vdc |
| 2N3055:
--- Quote from: Fungus on August 16, 2023, 02:00:25 pm --- --- Quote from: 2N3055 on August 16, 2023, 11:38:29 am --- --- Quote from: Fungus on August 16, 2023, 09:54:20 am ---Dave's video was about pretty much nothing other than noise --- End quote --- Errm... it is not? --- End quote --- Confirmed, there's no arguing with Siglent/BMW owners. Clue: Nobody's saying you're wrong. --- End quote --- You are the king of arguing with irrelevant or nonconnected data. Dave unpacked that scope for 23 minutes and then for 7 minutes has shown it has less waveform noise and better resolution that scopes with less resolution a larger noise. He could have shown comparison to several low noise 8 bit scopes (that includes several Siglents and a litlle Micsig) or compare it to other 12 bit low noise scopes. But that is beyond point. What would be interesting and "on point" for this topic would be showing how well Rigol DHO(HDO) would fare measuring a PSU noise. Where you need an FFT, and high sensitivity, and low noise etc... What he has shown is Rigol has nice packing, and unfinished product. That video is not a good recommendation. Rigol has to quickly debug and finish software and make a new video that shows it actually works.. Like Mike says, modern DSO are signal analysis machines. Rigol at this stage of development is an analog scope with some analysis options... How well those develop with time will shape how I judge it's usability for the task.. |
| 2N3055:
--- Quote from: uargo on August 16, 2023, 02:09:48 pm --- --- Quote from: 2N3055 on August 16, 2023, 11:38:29 am --- --- Quote from: Fungus on August 16, 2023, 09:54:20 am --- --- Quote from: Performa01 on August 16, 2023, 08:03:35 am ---Here also ... have you ever tested one? If so, why not show us the results, so everyone can see this "perfect capability" with their own eyes? I do not doubt that it can do it, but seeing is believing... --- End quote --- Dave's video was about pretty much nothing other than noise measurement: --- End quote --- Errm... it is not? As I said before, it seems Rigol uses decent ADC this time. And it seems to be (very?) decent noise levels, hardware vise. But that is hardware "promise". With half baked FFT and unfinished software not there yet. Problem in the real world is that measuring microvolt levels is not easy, and it is questionable if OP can make setup that will be better than the scope he has now... As Nico says, probing, grounding, shielding etc is critical here. It is unclear (even to OP) what he really needs. Saying "600 uV levels on power supply" without stating is it RMS or P-P or what BW is not really clear requirement. Also depending as to what this power rail is for maybe such low noise/ripple levels are not needed at all, i.e. devices powered also have it's own PSRR that might be sufficient for power not to be critical at all... --- End quote --- 600uVpp, I use a 2.5vdc CJ431 (Chinese TL431) voltage reference and the 12-bit adc from an STM32F401RCT6, so 2.5vdc/4096 steps = 0.0006v each step. but there is noise that I would like to reduce. and if I use a digital filter. The source consists of: 1 - 12vdc input 2 - 12vdc input, dc-dc source with a Tps54331 and 5vdc output 3 - 5vdc input, linear source with Ams1117-3.3 with 3.3v output STM32F401RCT6 and Cj431 voltage reference at 2.5v powered at 3.3vdc --- End quote --- You will need a better reference..... For interesting solution, lookup low noise designs based on old 723.. but you will need to power it with 12 V directly.. That would also be lower tempco... Use it as VDDA and ref... |
| uargo:
--- Quote from: 2N3055 on August 16, 2023, 02:30:34 pm --- --- Quote from: uargo on August 16, 2023, 02:09:48 pm --- --- Quote from: 2N3055 on August 16, 2023, 11:38:29 am --- --- Quote from: Fungus on August 16, 2023, 09:54:20 am --- --- Quote from: Performa01 on August 16, 2023, 08:03:35 am ---Here also ... have you ever tested one? If so, why not show us the results, so everyone can see this "perfect capability" with their own eyes? I do not doubt that it can do it, but seeing is believing... --- End quote --- Dave's video was about pretty much nothing other than noise measurement: --- End quote --- Errm... it is not? As I said before, it seems Rigol uses decent ADC this time. And it seems to be (very?) decent noise levels, hardware vise. But that is hardware "promise". With half baked FFT and unfinished software not there yet. Problem in the real world is that measuring microvolt levels is not easy, and it is questionable if OP can make setup that will be better than the scope he has now... As Nico says, probing, grounding, shielding etc is critical here. It is unclear (even to OP) what he really needs. Saying "600 uV levels on power supply" without stating is it RMS or P-P or what BW is not really clear requirement. Also depending as to what this power rail is for maybe such low noise/ripple levels are not needed at all, i.e. devices powered also have it's own PSRR that might be sufficient for power not to be critical at all... --- End quote --- 600uVpp, I use a 2.5vdc CJ431 (Chinese TL431) voltage reference and the 12-bit adc from an STM32F401RCT6, so 2.5vdc/4096 steps = 0.0006v each step. but there is noise that I would like to reduce. and if I use a digital filter. The source consists of: 1 - 12vdc input 2 - 12vdc input, dc-dc source with a Tps54331 and 5vdc output 3 - 5vdc input, linear source with Ams1117-3.3 with 3.3v output STM32F401RCT6 and Cj431 voltage reference at 2.5v powered at 3.3vdc --- End quote --- You will need a better reference..... For interesting solution, lookup low noise designs based on old 723.. but you will need to power it with 12 V directly.. That would also be lower tempco... Use it as VDDA and ref... --- End quote --- thanks |
| Martin72:
--- Quote from: Veteran68 on August 15, 2023, 11:21:16 pm ---What mood is that, exactly? --- End quote --- In any case, already no car club nonsense.... ;) No, I sometimes have the feeling that some overestimate the measuring equipment for small money or expect too much from it, because you have to spend quite a lot on it in relation to other hobby expenses. |
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