Products > Test Equipment
Rohde & Schwarz RTB2004 - Fan Noise
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javadesigner:
Hi Rydda!

Thanks for posting about this amazing modification you did  - Very elaborate and impressive! :-+

When you solve a problem, man you do solve a problem :-DD

Did you 3D print the external fan casing by any chance ?

Also, it is interesting that R&S are using a cheap Sunon fan. (to confirm, that's what you found in the stock R&S unit?). Given that R&S clearly spent time engineering the fan mounting etc, why would would they then nullify that advantage by using Sunon? I would have expected EBM-Papst, Noctua, etc, at least.
Rydda:
Hi
@javadesigner
The fan cover/casing just evolved during my testing. It is manually routed from a chunk of oak wood. If I had known beforehand that I would be satisfied with the noise reduction I would probably have printed it, or just heat formed some abs plastic.

I can confirm that the original fan was 'Sunon HA80251 v4', and also that it was not louder than the Noctua NF8. Both the air borne noise and the vibrations seemed to be just about the same. I must admit I was a bit surprised myself. I had previously replaced the crappy original fan (Sunon E80201S1) in an R&S NGE103 power supply with a Noctua NF8, and the difference was remarkable.

Afaik the rubber fan mounting in the RTB comes with the fan. I doubt the R&S people spend many minutes thinking about fan noise. They are probably more concerned with the fan mtbf.
Harjit:
I went through the reseller and it was a royal pain and slow process.
javadesigner:
An update:

Got a new unit from a different USA reseller. Talked to the reseller's R&S specialist on the phone and requested they ship from their latest inventory.

The unit I ended up getting has the latest Oct 2020 firmware installed, so it is a very recent manufacture.

Turning it on, this unit immediately feels less noisy than the previous one. The previous unit had felt like something was off/not quite right - was as loud as the Rigol 1104Z that I owned previously. The consensus on these forums seems to be that it was a faulty fan/sensor running full-on all the time without ramping down.

I would guess-timate this new unit to be about 30-35% less noisy than the previous unit. Additionally, the fan in this new unit does not oscillate between frequencies - the fan hum is clearly present but constant - much more like pink noise.

For comparison purposes, I have a benchtop power supply that (despite having a fan) is almost inaudible.

1) This new R&S is noticeably louder than the power supply. But not a whole lot louder. 

2) Compared to the previous unit, this unit is noticeably quieter. Quiet enough that it I don't feel something is wrong when it is turned on. Perhaps no R&S unit is going to be totally silent but mine is definitely on the right side of quiet fence - the pink noise just disappears after a while.

In all, this one is a keeper!  I'm very happy with the outcome... :clap:






 
Rich@RohdeScopesUSA:

--- Quote from: javadesigner on February 05, 2021, 05:10:53 pm ---In all, this one is a keeper!  I'm very happy with the outcome... :clap:

--- End quote ---
:-+

-Rich
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