Author Topic: Siglent SDS1104X-E noisy fan replacement  (Read 2494 times)

0 Members and 1 Guest are viewing this topic.

Offline Bob Sava

  • Regular Contributor
  • *
  • Posts: 89
  • Country: us
Siglent SDS1104X-E noisy fan replacement
« on: May 11, 2018, 03:07:46 pm »
For anyone contemplating fan replacement, here are specs of the fan used in SDS1104X-E:

Sleeve bearing, 60mm DFM6025S, 0.11A, 3300RPM, 17.41CFM, 2.56mH2O, 24.64dBm (yeah right  :-DD)


http://www.szdosense.com/eng/products-detail.asp?cpid=177


EDIT: as I was testing few replacement fans I realized that a lot of noise is from enclosure and vent holes, not the fan itself.  Well rated and reviewed Noisebreaker XR2 (15dBm) was still too noisy, and even 11dBm XR1, while totally silent outside, it can be heard once mounted.
« Last Edit: May 15, 2018, 08:01:53 pm by Bob Sava »
 
The following users thanked this post: 17_29bis

Offline TWMIV

  • Contributor
  • Posts: 18
  • Country: us
Re: Siglent 1104X-E noisy fan replacement
« Reply #1 on: May 11, 2018, 03:56:03 pm »
Slap this in there and enjoy the silence then!
https://noctua.at/en/nf-a6x25-flx

This is something that I will probably hold off on until the factory warranty expires. The fan is quite loud though...
 
The following users thanked this post: 17_29bis

Offline Bob Sava

  • Regular Contributor
  • *
  • Posts: 89
  • Country: us
Re: Siglent 1104X-E noisy fan replacement
« Reply #2 on: May 11, 2018, 04:29:17 pm »
I think two low RPM fans, one blowing (at PSU and Zynq) and other exhausting would be more optimal and pretty much silent.

As to warranty, from what I read, at least in USA, Siglent cannot invalidate warranty w/o proving it was caused by modification.  And, if scope has been running fine for months already the only thing I can think of that could break it are firmware upgrades.
 

Offline Fungus

  • Super Contributor
  • ***
  • Posts: 11463
  • Country: 00
Re: Siglent 1104X-E noisy fan replacement
« Reply #3 on: May 11, 2018, 05:23:55 pm »
As to warranty, from what I read, at least in USA, Siglent cannot invalidate warranty w/o proving it was caused by modification.  And, if scope has been running fine for months already the only thing I can think of that could break it are firmware upgrades.

I definitely regret not upgrading my Rigol fan sooner. If it's six months old then it's unlikely to fail due to hardware.

(unless you put in a completely unsuitable fan and it overheats, obviously)
 

Offline Bob Sava

  • Regular Contributor
  • *
  • Posts: 89
  • Country: us
Re: Siglent SDS1104X-E noisy fan replacement
« Reply #4 on: May 15, 2018, 02:06:34 pm »
I ended up installing two Noisebreaker XR1 fans, one blowing in, the other exhausting (pic).  I  also tried more powerful XR2, which is close to original fan in specs, but two were just too noisy and likely too much.  XR1 attach with no tools, with rubber mounts that came in the box (blue part in the pic) and piece of doublesided foam under blowing fan to keep it in from sliding up and down.

Two fan push-pull configuration seems to work well and is quiet.  I keep wondering why Siglent engineers did not put their single fan on the left side, instead of right, blowing air in - it makes a lot sense to have one on the left since PSU's heatsink, Zynq processor and ADCs are on that side.

« Last Edit: May 15, 2018, 03:05:54 pm by Bob Sava »
 

Offline sibir

  • Contributor
  • Posts: 5
  • Country: us
Re: Siglent SDS1104X-E noisy fan replacement
« Reply #5 on: March 27, 2020, 12:10:11 am »
Just got my SDS 1104X-E (HW version 01-04, whatever that means) and I am seriously bothered by the vent noise.

My Kill-A-Watt tells me that it is using 23 W. Not a whole lot. So I wonder how much air flow is actually needed. Has anybody looked at the running, open unit with an IR camera (I am aware if the emissivity caveat)? How warm do the various parts get? And the Zynq SoC's heatsink? Which component is most critical? Maybe a thermistor based fan speed controller is the solution? Maybe a tiny fan mounted on the heatsink?

If the airflow through the vents is causing the noise and not the fan, I don't understand how having to fans would make it quieter unless the flow is lower despite having 2 fans.

I also came across this interesting comparison of different vent pattern designs with regard to noise:
https://www.pugetsystems.com/labs/articles/Effects-of-Grill-Patterns-on-Fan-Performance-Noise-107/

Judging by the stacked vent patterns and the partially occluded fan I have the impression Siglent has not paid any attention to the noise issue >:(

My warranty period is apparently 3 years, so I am reluctant to open up my unit just to try things...
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 19673
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SDS1104X-E noisy fan replacement
« Reply #6 on: March 27, 2020, 12:59:57 am »
Just got my SDS 1104X-E (HW version 01-04, whatever that means) and I am seriously bothered by the vent noise.
..........................

Judging by the stacked vent patterns and the partially occluded fan I have the impression Siglent has not paid any attention to the noise issue >:(
Welcome to the forum.

Well that might be your impression but reality is different.
Designers must consider all environments where an instrument might be used and provide adequate cooling to ensure the stated specifications are met. Period.
If a quieter fan can be used in SDS1004X-E models they already would be using one as has already been done in SDS1202X-E units that are somewhat quieter than in early units.

Fan mounting OTOH can be improved so to transfer less harmonics into the chassis so it doesn't reverberate noise such as a loudspeaker might and if you are to attempt to reduce noise I recommend modifying the fan mounting and nothing else. 

Quote
My warranty period is apparently 3 years, so I am reluctant to open up my unit just to try things...
Wise.
If you can leave it for a year to lower the infant mortality risk the need to rely on warranty support should be greatly diminished.
FYI, of the many dozens I've sold just one had a very rare dodgy fan that occasionally would squeal and it was replaced under warranty without issue. Siglent wanted to know everything about that fan as I don't believe they have had other issues with them.
Avid Rabid Hobbyist
 
The following users thanked this post: sibir

Offline bluejedi

  • Contributor
  • Posts: 36
  • Country: nl
Re: Siglent SDS1104X-E noisy fan replacement
« Reply #7 on: April 20, 2020, 03:21:05 pm »
Another option to further reduce fan noise and improve airflow would be to remove the punched (circulair) grill fom the inner metal casing where the fan is mounted to (using a dremel tool or similar).
The plastic outer casing already contains a (striped) grill that mechanically protects the fan.

Similarly the punched (striped) metal grill on the right side (without fan) will also increase noise and reduce airflow, but probably (much) less substantial.
Removing it may further reduce noise and increase airflow.

As manufactured there are double grills both on the left (fan) side and right side of the scope: both in the metal inner casing and in the plastic outer casing.
Placing one grill behind another increases noise & turbulence and reduces air flow. This will be worse when the grills have different patterns (more obstruction of air flow), which is the case here on the fan side.

No-grill will provide the least noise and best air flow but is not safe. Therefore placing a single grill is standard. The double grills on the SDS1x04X-E however are far from optimal.

Based on my logic and limited knowledge, removing the punched grills from the metal inner casing should not cause any safety issues because the outer plastic casing already provides grills and also the power supply is already shielded with its own metal cover.
If removing the punched metal grills would be an issue (for whatever reason) then they can be replaced with wire grills which are more optimal.

Questions:
  • Does removing the grills from the metal inner casing have any negative impact on safety (regulations), even while the plastic outer casing already provides grills?
  • Could removing the metal grills have any substantial negative impact on RF/noise shielding?

« Last Edit: April 20, 2020, 03:38:16 pm by bluejedi »
 

Offline bluejedi

  • Contributor
  • Posts: 36
  • Country: nl
Re: Siglent SDS1104X-E noisy fan replacement
« Reply #8 on: April 20, 2020, 03:43:30 pm »
I ended up installing two Noisebreaker XR1 fans

Do you mean Noiseblocker BlackSilent XR-1 ?
 

Offline Bob Sava

  • Regular Contributor
  • *
  • Posts: 89
  • Country: us
Re: Siglent SDS1104X-E noisy fan replacement
« Reply #9 on: July 26, 2020, 06:13:58 pm »
You're right: I used two NoiseblockerXR-1 1600rpm 60mm fans.  Later, I also added some copper tape around the fans, just because I could.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf