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| Siglent SDS1104X-E noisy fan replacement |
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| coppice:
--- Quote from: tautech on October 20, 2022, 08:08:56 pm --- --- Quote from: coppice on October 20, 2022, 06:10:47 pm --- --- Quote from: ceut on March 24, 2022, 09:49:00 pm ---As I have 2 bigs 12cm Noctua Fan in my computer since some years (on the CPU heatsink, in push-pull configuration) , works very well and I don't hear them at all, I also ordered the Noctua NF-A6Fx25 FLX to try it. --- End quote --- Did you try a Noctua fan, and was it effective? --- End quote --- Our customer did with a Noctua with very similar spec to OEM without gaining any significant difference. Investigating further for him I cut the metal fan grille from mine and this too didn't gain a significant difference. IMO the only way to address this is to undervolt or change the fan to one of a different spec, however then throw the datasheet accuracy spec out the window. --- End quote --- That's very useful input. Thanks. It sounds like you just have to live with this. Its not horrible, but it is annoying. |
| tautech:
--- Quote from: coppice on October 20, 2022, 08:10:55 pm --- --- Quote from: tautech on October 20, 2022, 08:08:56 pm --- --- Quote from: coppice on October 20, 2022, 06:10:47 pm --- --- Quote from: ceut on March 24, 2022, 09:49:00 pm ---As I have 2 bigs 12cm Noctua Fan in my computer since some years (on the CPU heatsink, in push-pull configuration) , works very well and I don't hear them at all, I also ordered the Noctua NF-A6Fx25 FLX to try it. --- End quote --- Did you try a Noctua fan, and was it effective? --- End quote --- Our customer did with a Noctua with very similar spec to OEM without gaining any significant difference. Investigating further for him I cut the metal fan grille from mine and this too didn't gain a significant difference. IMO the only way to address this is to undervolt or change the fan to one of a different spec, however then throw the datasheet accuracy spec out the window. --- End quote --- That's very useful input. Thanks. It sounds like you just have to live with this. Its not horrible, but it is annoying. --- End quote --- The same form factor 2ch SDS1202X-E has a much quieter fan but also less than half the HW inside also and that is where they would be great to be but I think the 4ch X-E would run too hot. The FPGA generates most of the heat as I checked on this recently when doing a warranty repair but the fan is some distance from it so maybe directed ducting and a quieter fan can do the job adequately but we mustn't overlook cooling the PSU also. The mainboard is fixed to the internal metal chassis in numerous places so that too will be adding to the overall heat dissipation picture. To do a proper job IMO exhaust heat and FPGA temp need be monitored while progressively slowing the fan in 30 minute steps to find where temps start lifting and the corresponding fan RPM. However results must be related back to ambient and of course only be valid at those temps but for those working in climate controlled workspaces it could be done successfully. |
| BillyO:
--- Quote from: coppice on October 20, 2022, 08:09:40 pm ---Is there something seriously wrong with your notebook? --- End quote --- No. It's quiet when the fan is off, but when the fan kicks in it's noticeable. Maybe a tad quieter than the SDS1104X-E, but not a ton. If they are both on together they just seem to blend into each other. My UNI-T scope makes the Siglent veritably noiseless. Let's not even talk about my Tek 475 let alone the KORAD KA3305P power supply which re usually on too! I honestly don't know what it would be like to actually do work in lab where the sound of the Siglent scope would be the slightest concern. I guess the point I'm trying to get across is, if your doing any work, you will have stuff turned on. There will be noise. Even sitting in my office right now the sound of the PC and the NAS would drown out the Siglent scope. |
| balnazzar:
--- Quote from: coppice on October 20, 2022, 08:09:40 pm --- Is there something seriously wrong with your notebook? I wouldn't call the SDS1104X-E noisy by test equipment standards, but those standards are pretty low. I have an X220 beside the scope right now, and the scope completely swamps the notebook. --- End quote --- It's something in between a hair dryer and a vacuum cleaner. I regularly use SDS5000s and they are *much* more silent than the 1104x-e. Today, I tinkered with an old 1 GHz Agilent scope at the university. It's as deep as a CRT scope despite being digital, weighs a ton, and needs a lot of cooling. In terms of sheer sound pressure, maybe it's even a bit over the 1104x-e, but since the pitch is much lower (big fan), one finds it to be more bearable (but it worn me off after a while nonetheless). The 1104x-e exhibits both high sound pressure and high pitch. Pity, because it's a good scope. However, consider that the fan always run at maximum rpms, and is made to cool the scope under stress with 40C. From my experience with small fans, if you run them at 9V rather than 12V, the difference in airflow and static pressure won't be dramatic, but the difference in acoustical noise could be substantial. |
| balnazzar:
--- Quote from: BillyO on October 20, 2022, 08:37:47 pm ---My UNI-T scope makes the Siglent veritably noiseless. Let's not even talk about my Tek 475 let alone the KORAD KA3305P power supply which re usually on too! I honestly don't know what it would be like to actually do work in lab where the sound of the Siglent scope would be the slightest concern. --- End quote --- Now I'm really thinking that maybe I got a defective 1104x-e specimen. |
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