Products > Test Equipment
DHO1074 horrible fan noise
brandmeist3r:
Hi there,
I just got my new DHO1074 fresh out of the box directly from Rigolshop EU and I am a little disappointed.
So far I have not found any topic regarding the fan noise, so I made a quick video.
The fans are so loud, that working without headphones is not possible.
https://youtu.be/TvXG3V9IeCQ
@EEVblog Dave if you want to include the video or parts of it, you may do so.
I will tear it down, check out the fans and update the post later.
Anyway, what replacement fans should I get? Thinking of Noctua.
How was your first experience with the new DHO1000 series?
ebastler:
Yes, the fans are very loud indeed -- especially considering that the enclosure is large and would have room for a large, slow-running fan. My first impression after powering up my new DHO1074 last year was "Ready for lift-off!".
I decided to return the scope, mostly for other reasons. But there is a way to make it noticeably quieter via a software change only -- the fans have PWM control, Rigol just does not use it: https://www.eevblog.com/forum/testgear/hacking-the-hdo1khdo4k-rigol-12-bit-scope/msg5231181/#msg5231181
(You can also look into installing quieter fans of course. But that's probably not something you want to do right away, in case you decide to return the scope or need a warranty repair. The software modification is easily reversible.)
Edit: There are multiple temperature sensors on the main board which can be read via a dialog in the Utility (?) menu. So you can check temperatures before & after reducing the fan speed to make sure the scope is still in a healthy state.
brandmeist3r:
Yeah, ready for liftoff is the right description, it sounds like the bearings are broken.
I will try to adjust them via PWM first, thanks for pointing me in that direction.
Really a bummer, that the warranty will get void if opening the case. I might swap the fans later tho.
NE666:
It's not quiet but honestly, this is lab equipment and not the latest ipad, PC or consumer electronics item. People should hold expectations accordingly.
brandmeist3r:
Agreed, but I have never experienced such loud lab equipment and I did not have that expectation.
I also have previous experience with industry test equipment, never had such a loud unit.
Also, in the video it is not as loud as irl, I guess my iPhone did some suppression there.
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