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Fan replacement on the Rigol DP832

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invzim:
Great info here, just modded my DP831 with a Noctua NF-A8 PWM.  A 150 ohm 3w resistor in parallel did the trick.

I took one of the adapter cables that came with the Noctua and made this contraption, works great :)


gsezz:
Hey guys, first I want to thank you for the information.

Actually my first thought wasn't fan noise in the form of bearing noise or PWM chirping. It was wind noise, and a lot of it. Caused by constricted airflow and sharp edges.
After swapping the fan to a Noctua, it still was a bit too loud for my liking. I was pretty sure that the fan grill caused a lot of this noise. So I decided to cut the grill, and the difference is huge!
Just out of curiosity I swapped back to the original fan. The difference between Sunon with grill and Sunon without grill is even bigger. I'm sure there could be even some improvement in rounding the edges of the big heatsinks, but I didn't want to to cover the whole thing in metal shavings.
So, if you're looking for an really easy option to reduce the noise without lowering the airflow, just cut the grill from the outside! In my humble opinion this shouldn't even void the warranty, but who am I?
I don't like the fan exposed like this. I'll probably get one of those wire type fan grills. They don't cause a lot of noise.

Also, with the lower airflow fan, I thought it might be a good idea to reverse the direction of the fan, to blow into the case instead of sucking out. I don't have any temperature meassurements, but I observed more air movement around the big heatsinks. I don't know if it helps, but i'm certain it doesn't hurt.

edit.
Another thing I'll try will be a Noctua S12A FLX with a 80-120mm adaptor. In "Ultra Low Noise" mode (series resistor), this fan has almost the same airflow as the Sunon at only 7.4dBA. It doesn't have a lot of static pressure, but i think in this case the flow is more important.

...I'm a silent freak. It can't be quiet enough. ;)


lexaiden:

--- 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.

gsezz:
btw. I did what I mentioned above. I mounted a Noctua S12A FLX with 80-120mm adaptor at the outside. It is rated 65,8 m³/h with the ULNA cable @700rpm. With the removed original sharp edged Fangrill this is almost absolut silent.
I had to cut away a bit of the lower sheet metal edge of the outer case, because it collided with the fan when I wanted to slide it back on. A better solution would bee to find a way to mount the fan from the outside, after the case ist closed. But this was the easy fix.

Downside of this mod: I can't stand the Unit on its back. But other than that, i'm really happy with it.

k8943:
Found a guide to fan grill styles regarding noise/airflow:

https://www.pugetsystems.com/labs/articles/Effects-of-Grill-Patterns-on-Fan-Performance-Noise-107/

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