Products > Test Equipment
Siglent SDS1104X-E noisy fan replacement
coppice:
--- Quote from: BillyO on October 20, 2022, 10:27:12 pm ---I just did a little test. Turned everything off in the lab then did a sound test on the UNI-T and the Siglent. The UNI-T was 6dB louder than the Siglent. That is quite a bit. The Siglent was just under 3dB louder than the Lenovo X230 notebook with the X230 blowing as hard as it could. So it is noticeably louder than the notebook, but very much quieter than the UNI-T. The UNI-T sound is not only louder but has more high frequency noise so it even more annoying.
Anyway, I guess I'm just used to working in noisy environments as the noise it makes is generally not noticeable to me when things are normal (lots of stuff blowing). Maybe I'm going deaf.
--- End quote ---
The fans in the Uni-T scopes I've used seem to get the chassis into resonance, which can be quite unpleasant for long periods.
sja:
Tautech:
What about something like these cheap fan controllers: https://www.aliexpress.com/item/4000120607047.html?spm=a2g0o.productlist.main.5.3e033c8bpmZxY2&algo_pvid=6ce9d057-c345-46c6-bd57-ee2536774044&algo_exp_id=6ce9d057-c345-46c6-bd57-ee2536774044-2&pdp_ext_f=%7B%22sku_id%22%3A%2210000000332499657%22%7D&pdp_npi=2%40dis%21EUR%213.35%212.88%21%21%211.72%21%21%402100b1a616664275073707418d0764%2110000000332499657%21sea&curPageLogUid=gWuAS4LC4PNt
I have only used them in manual mode to provide cooling for devices without fan headers.
In the model that I have, the temp sensor cable is 9.5 cm from the tip to the top of the connector. Would that be long enough?
tautech:
--- Quote from: sja on October 22, 2022, 08:41:01 am ---Tautech:
What about something like these cheap fan controllers: https://www.aliexpress.com/item/4000120607047.html?spm=a2g0o.productlist.main.5.3e033c8bpmZxY2&algo_pvid=6ce9d057-c345-46c6-bd57-ee2536774044&algo_exp_id=6ce9d057-c345-46c6-bd57-ee2536774044-2&pdp_ext_f=%7B%22sku_id%22%3A%2210000000332499657%22%7D&pdp_npi=2%40dis%21EUR%213.35%212.88%21%21%211.72%21%21%402100b1a616664275073707418d0764%2110000000332499657%21sea&curPageLogUid=gWuAS4LC4PNt
I have only used them in manual mode to provide cooling for devices without fan headers.
In the model that I have, the temp sensor cable is 9.5 cm from the tip to the top of the connector. Would that be long enough?
--- End quote ---
Depends on where the sensor is best to be located as there are a # of things to be considered:
PSU heat and the need to keep its caps cool.
Mainboard temps, to keep operating temp stable (after warm up) and system accuracy temperature stable.
Cooling the FPGA in particular where all the hard work goes on and it's the only device sporting a heatsink.
To do this properly it's within the realms of a thermal engineer and temp stable environs so to test different ambients to see how well the cooling system can keep the system temps stable.
By far the simplest solution is to throttle back the fan a little to reduce noise by how much, that is the issue.
I don't have the equipment to test temperatures accurately and all the locations needed and the fan adjustment could be quite simple with a 1W wirewound pot as we are only dealing with ~60mA fan current.
Maybe a 200 Ohm pot has the range to make adjustments.
A noncontact RPM meter can give us a OEM measurement and post mod measurement that we should be able to correlate to fan charts for flow and pressure results that might also point toward a better fan replacement.
It's just not a 5 minute job to do properly.
chemary:
I bought this scope 4 years ago, it's a great scope more than enough for my hobby projects but it's loud fan is really annoying (sometimes I want to leave the data-logging overnight but my flat is small and I have it close to my bed).
While trying different solutions I noticed that closing the plastic enclosure increases the noise. The air exhaust is really bad designed as it's partially obstructed by the plastic enclosure and probably it creates some turbulence that increases noise. I have put some anti-vibration foam between the metal and the plastic and the noise has drop a little, I have not measured it so it's just my impression.
I tried different fans I have lying around from old computers but the original is by far the less noisy, then as suggested on this forum I was trying different fan voltages I added two 1N4148 diodes to drop the voltage 1.2V as it's hot where I live and dropping the voltage to 9V seems too much.
LogicalDave:
@chemary Did the two diode-drops reduce the noise significantly?
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