Products > Test Equipment
Siglent SDS1104X-E noisy fan replacement
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AdiGital:

--- Quote from: Neutrion on March 24, 2022, 10:22:58 am ---Thank you for the pictures!
Nice little heatsink on the ADC. Did you check whether there is any difference in RMS (or rather standard deviation) noise level before and after the "heatsinking"?
How did you get them BTW?

It is quiet disappointing that the Rubycon caps are gone, and also begs the question wheter Dave might gets "prepared" examples sent to him for testing.

--- End quote ---

I didn't do any other analysis than the temperature plots. In my opinion, the mod should not affect any dynamic parameters in the slightest. The only result is that I raised the "environment" temperature the scope operates in. The highest temperature increase is the FPGA heatsink which raised by 5°C and the other components even less than that. My room temperature is in the range of 22-26°C. So after the mod it's like it was working in 27-31°C without it. Way below 40°C max stated by Siglent. Also, since I used a linear regulator there is no additional noise introduced (like switching from buck converter).

The blue heatsinks are for stepper motor drivers. I bought them a while ago when building 3D printer. I believe these are the ones I used:
https://www.amazon.co.uk/Easycargo-Heatsink-conductive-adhesive-9mmx9mmx12mm/dp/B07G12KXH6/ref=sr_1_7?crid=1KGHHTW5RY9XA&keywords=stepper+motor+driver+heatsink&qid=1648118712&sprefix=stepper+motor+driver+heatsink%2Caps%2C69&sr=8-7
Neutrion:
I was thinking about a possible much cooler ADC actually performing a bit better, but not a lot is told in its tech doc about this topic.. But in your case the difference is not much anyway, as for the cooling fins you also have  a slightly higher inside temp.
ceut:

--- Quote from: AdiGital on March 23, 2022, 10:18:55 pm ---I also included a shot of my mod. I know under-volting the fan isn't the best method but since the scope can work in 40°C environment, I assumed there is enough room to lower the air flow. It's been working for a couple of days and no issues noticed. As I mentioned earlier it's much quieter. Now having all 4 instruments on isn't a problem anymore.

--- End quote ---

Hello,
Thank you for sharing your mods !
I have ordered this one: https://fr.aliexpress.com/item/32954848967.html 
and select "10pcs Type A".

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.


MathWizard:
I'm going to tinker with my sds1104 and sdm3065, when 1 or both are on, next to my PC, it's too loud. And I don't like turning off the DMM since it has no memory of my settings.

I live in a fairly cold place, so I'll be fine turning it down a little, or trying some old PC case fans I have.
tautech:

--- Quote from: MathWizard on May 10, 2022, 10:21:53 pm ---I'm going to tinker with my sds1104 and sdm3065......And I don't like turning off the DMM since it has no memory of my settings.

--- End quote ---
Oh yes it does !
Goto:
Utility (Shift + Dual) > Store/Recall > Power On = Last. < Last used settings saved for next boot.
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