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RIGOL DS2000 mod - silent fan

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ilcibernetico:
Hi guys,
i finally bought a fantastic DS2072 oscilloscope.
After an initial inspection, I updated the firmware to the latest version and installed all options thanks to this blog:
https://www.eevblog.com/forum/testgear/sniffing-the-rigol 's-internal-i2c-bus /
The only flaw I found is that the fan is very noisy, my lab is very quiet.
To solve the problem, I purchased a quiet fan NOCTUA 60x60mm model NF-A6x25 FLX : http://www.noctua.at/main.php?show=productview&products_id=48&lng=en

In order not to void the warranty, I removed the seal without damaging it.
I used the hot air station to heat the seal without damaging it.
The first step is to remove the 4 screws that hold the lids.
After removing the screws, start to heat seal the lid away slowly ....



the seal will remain attached to the lid.





Remove the nut of the BNC connector and all the screws that hold the shield



Here is the Noctua.
It provides as an option, the use of 3 speed settings for full flexibility
Providing 3000, 2400 and 1600 rpm speed settings via the supplied Low-Noise and Ultra-Low-Noise Adapters.
I have not used adapters.



Remove the connector on the motherboard and the fan screw.



The noctua involves the use of a fixing system in silicone to reduce vibration and therefore decrease the noise





here is the fan fixed with silicon supports





I had to get a plug adapter for the electrical connection.
Here is the fan installed :



At the end of the installation, I approached the cap carefully, leaning against the seal and gently pressing to adhere the adhesive.
Et voila changes you make with success!



Now the noise is acceptable  :=\ and the fan still guarantees a good ventilation.
I hope this guide will be of help to people like me who has the sensitive hearing!
Thank you and congratulations for the contribution given to the forum.

Bye

ilcibernetico

nctnico:
I like the silicone mounting hardware. But... did you check the amount of airflow of the fan? As far as I can tell from your pictures the old one is 0.19A and the new one is 0.12A which leads me to suspect the new fan doesn't move as much air as the old one.

Clint:
What does it sound like with the original fan and the new silicone mountings ?

Also the mountings look like they stand the fan away slightly this would reduce the flow somewhat.

ilcibernetico:
The absorption of the fan is influential on performance.
The original fan is thinner and is an "economic" model compared to the Noctua.
Ta original fan has an air flow of 0.52 M3/min = 31.2 m3 / h
The Noctua has an air flow of 29.2 m3 / h



ilcibernetico:

--- Quote from: Clint on November 21, 2013, 09:16:37 am ---What does it sound like with the original fan and the new silicone mountings ?


--- End quote ---

The silicon supports reduce vibration but I think the more noise is produced by the original fan speed (5500rpm) compared to the 3000RPM noctua.
The acoustical noise of original fan is 39dB(A) and acoustical noise of Noctua fan is 19.3dB(A) at same Airflow  :-+


--- Quote from: Clint on November 21, 2013, 09:16:37 am ---
Also the mountings look like they stand the fan away slightly this would reduce the flow somewhat.

--- End quote ---

I do not think will affect much anyway you could put a small neoprene frame...

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