Rigol DHO 914 (all DHO800/900 series) Fan mod

[Gadjet]

Just got my Rigol DHO914 and I like it but the fan noise is really getting on my nerves, not specifically how loud it is but the tone of it.

I'm playing with the idea of adding a replacement fan on the rear, a NoctuaNF-B9 Redux-1600, this fan runs slowere and much much quieter but as it larger it moves more air and even mounted on the rear of the case with a 3D printed bracket, the short test I did ran 2 degrees cooler than with the stock fan and I couldn't even hear it.

Now this is a first off proof of concept and needs some more fiddling to get the bracket so it doesn't hit the desk when leaning back and to be able to mount it on the VESA mount but it proves, to me, that the larger slower quieter fan is the way to go.

Does anyone know if there's a 3D model of the rear cover out there?

[Gadjet]

Changed the mount and printed it in a closer colour match to the Scope and used a thinner fan (15mm) so it will sit on the bench without resting on the mount.

The finger guard is a work in progress.

[thm_w]

Similar idea: https://www.eevblog.com/forum/testgear/rigol-just-launch-its-new-function-generator-dg800pro-900pro/msg5433680/#msg5433680
80 or 90mm fan works for the gen.

[Gadjet]

Oh yes, thanks for that link, I tried a flat plate to begin with but wanted to enclose the fan and have a finger guard but what I've found is that if I have a 3D printed finger guard over the fan with a 5mm hexagon pattern it makes the fan more noisy whenever the guard is place over the fan so I've ordered a wire finger guard and I hope that's more quiet.

With the Noctua 12V 92mm fan @ 8V and no finger guard it's virtually silent.