Electronics > Projects, Designs, and Technical Stuff
Fan replacement on the Rigol DP832
Pinkus:
I second the comment with recommending cutting away the grill.
I measured the noise: just cutting and replacing the grill reduces the noise by 50%. As you then can lower the air flow, you may reduce the noise further just by adding a 47 Ohm resistor in the existing fan power line.
See here my post about it:
https://www.eevblog.com/forum/testgear/dp832-fan-replacement-2018/msg2612937/#msg2612937
drummerdimitri:
--- Quote from: lexaiden on July 12, 2018, 09:06:28 am ---
--- Quote from: raptor1956 on September 11, 2016, 01:29:22 am ---The problem I have with just about all these quieting mods is that the fans they use to replace are quieter because they've been designed to run slower and move less air. The modified unit will be quieter but it will also tend to run hotter because the fan doesn't move as much air. (...)
--- End quote ---
That was exactly my thought and I came up with a 92mm fan...
In my Rigol DP832 is a SUNON ME80251V1-000C-A99 fan installed:
RATED SPEED: 3200 RPM
AIR FLOW: 69.65 m³/h
STATIC PRESSURE: 4.57 mm H₂O
ACOUSTIC NOISE: 33 dB(A)
I could not find a 80mm fan which had a similar air flow and is much quieter. Luckily there is just enough room in the power supply for the 92mm fan and a fan duct. So I came up with the 92mm fan NOCTUA NF-A9 PWM:
RATED SPEED: 2000 RPM
AIR FLOW: 78,9 m³/h
STATIC PRESSURE: 2,28 mm H₂O
ACOUSTIC NOISE: 22.8 dB(A)
Maybe my solution is also interesting for other users, I uploaded the thing here: https://www.thingiverse.com/thing:2994987
It is not completely quiet, but quiet enough for my taste. The Noctua NF-A9 FLX with 64,6m³/h air flow and 17.1dB(A) would maybe also an option.
--- End quote ---
What resistor value did you use to get the NF-A9 working and how did you connect it since I am in the process of doing the same modification as well.
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