Products > Test Equipment
Siglent SDS1104X-E noisy fan replacement
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Neutrion:
So I should learn to read...."above room temperature". So that means we are at around the same ballpark.
(If your text is not edited but it doesn't seems so.)

But still if you would happen to have time and motivation would be nice to know whether the caps were changed.

Isn't the fan on 10v normally? That stands in the SM for the scope.

Did you check if your temp. regulation might causing a cycling internal temp. change of the scope, throwing off the measurements as the fan rpm goes up and down?

Oh I am so fed up with that sticker...
pope:
Maybe there's some replacement fan that would do the job? A noctua or some other brand?

I have both a 1104x-e and a sdg1032x and they are really noisy and annoying.
Neutrion:
That is what I am thinking of as well,(before after 3 years getting rid of some plastic on the exhaust side as a minimum)  so now I checked the overhyped Noctua brand... they don't even provide the pressure-airflow chart of the fan, the bare minimum technical parameter. (Even the current cheap chinese has it in its doc.)
It seems to be the Dyson of the fans.

So I would rather try it with a Papst instead, usually they are very silent not just on the db scale but on the "annoyingness of the noise" scale as well. At least many years ago I did a lot of comparison of 80x80 fans, and nothing come close to them within the same airflow level. Also no commutation noise with them. (The roaring sound some slower turning fans have.)
AdiGital:

--- Quote from: Neutrion on March 23, 2022, 06:57:06 pm ---[...]
But still if you would happen to have time and motivation would be nice to know whether the caps were changed.
[...]

--- End quote ---
As requested, the caps are identified along with the PSU version - see pics. After you mentioned ADCs I measured them with IR camera when disassembled. They showed about 50°C. So just in case I now added heatsinks to them as well.


--- Quote ---Isn't the fan on 10v normally? That stands in the SM for the scope.

--- End quote ---
Double checked - the fan is definitely powered with 12V. I think it's the SDM3055 that's about 10.8V.


--- Quote ---Did you check if your temp. regulation might causing a cycling internal temp. change of the scope, throwing off the measurements as the fan rpm goes up and down?

--- End quote ---
The fan isn't thermally regulated so there is no deviation. It's fixed speed.

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.

Neutrion:
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.
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