Products > Test Equipment
Siglent SDS1104X-E noisy fan replacement
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imk:
Have spent some time testing PC fans and much quitter fans can be bought for not a lot.
But maybe adding a fan speed controller would help, as from my experience you only have to reduce the power a little for a quitter fan.
I guess many of us have temperature multimeter probes so would be interesting to see how hot it gets inside the scope in a warm sunny environment with fans running flat out.
tautech:

--- Quote from: bluejedi 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?
--- End quote ---
I haven't noticed any resulting from an experiment with my SDS1104X-E completely removing the fan side metal grille which BTW didn't offer any noticeable improvement in fan noise.


--- Quote from: imk on June 16, 2021, 09:30:27 pm ---Have spent some time testing PC fans and much quitter fans can be bought for not a lot.
But maybe adding a fan speed controller would help, as from my experience you only have to reduce the power a little for a quitter fan.
I guess many of us have temperature multimeter probes so would be interesting to see how hot it gets inside the scope in a warm sunny environment with fans running flat out.

--- End quote ---
This I believe is the only solution by slowing the fan slightly which must be done very carefully in a scientific manner while monitoring IC and/or exhaust gas temps along with ambient temp changes.
1audio:
I think this https://www.quietpc.com/ac-arctic-f12-tc would be a better choice. Slow unless the sensitive part gets hot. I have used similar in other instruments and it works very well. Key question- where to sense?

These are all quiet compared to a Tek 547. It could be much worse.
Neutrion:
Did anyone ever actually measure, how off the measurements can be with lower airflow? Because I think if the temp is going slowly up and down again, in case of a not properly done temp. control, the measurement values could start oscillating. Was removing the grill causing more measurement noise?
Because from air cisrculation and noise perspective (in case of a properly designed fan of corse.) removing anything downwards from the traiiling edge of the fan blade would absolutely make sense, even in changing efficiency. I would try a Papst with the same dimensions, and pressure curve first to be on the safe side. But don't want to loose the warranty...
pope:

--- Quote from: Bob Sava 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.



--- End quote ---

Hi, just wondering whether your scope is still working OK after 3 years? I'm thinking of doing a similar mod so I thought I'd ask for your experience  :)
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