SDS1204X-E Knob and Fan - Page 1
Forum section: electronics / testgear

author: PatrickB
author_rank: Regular Contributor
timestamp: September 02, 2025, 05:43:08 pm
content: Hello,on a Siglent SDS1204X-E oscilloscope, the fan is a little noisy, and the rotary knob used to select different parameters (the one at the top) is too sensitive.Have you replaced this knob with a less sensitive model than the original and the fan with a quieter one?Do you have any references or suppliers to replace these components?I think this topic was already covered a long time ago, but I couldn't find it.Thank you for your information.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 02, 2025, 06:04:45 pm
content: @Tautech here is the Siglent representativeFor sure he would say, is the scope has the latest Fw installed ?send him a pm ...

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: September 02, 2025, 06:11:42 pm
content: fan is Sleeve bearing, 60mm DFM6025S, 0.11A, 3300RPM, 17.41CFM, 2.56mH2O, 24.64dBm or similarbut there is a lot of noise from the shape of chassis inlets and outletsfriend of mine tested some noctuas and eventually he made some adapter to mount large noctua 12 cm ULN on side trimmed to desired airflow ratio but almost anything from shop will be betther than that one there

author: sonpul
author_rank: Regular Contributor
timestamp: September 02, 2025, 08:48:20 pm
content: I was also not very happy with the behavior and shape of the selection knob. But I made one rearrangement and I am happy with everything. I swapped the Intensity Ajust and Horizontal knobs. When the Intensity Ajust knob became larger, it became much more convenient to work and press and there are almost no errors. And the small Horizontal knob is also very convenient to use. The only thing is that I had to put a piece of something in the large knob in its new place because it sat too deep and touched the body when pressed.

author: tautech
author_rank: Super Contributor
timestamp: September 02, 2025, 08:55:34 pm
content: Quote from: PatrickB on September 02, 2025, 05:43:08 pmFan replacements and airflow path modifications don't always get much noise reduction....been there done that and earned the T shirt.This is a complex job to do scientifically as multiple internal temperature readings are required over a range of ambient temperatures.Instead a minor RPM reduction can be made by installing a series resistor to reduce fan noise, some have done this and have a result they can live with.Multipurpose encoder response is a personal issue in the way you use it where placing the hand atop the scope to steady it results in better encoder control OR press it to have the virtual keypad appear and use that for any inputs/adjustments.

author: Ringmodulator
author_rank: Regular Contributor
timestamp: September 04, 2025, 10:46:00 am
content: Hi,on my former two dsos, i had replaced the encoder on the top left for selecting various parametes with a detented one.This was sustantially more conveniant for me.I have not yet found a matching replacement for the SDS1204X-E encoder.Any hints are welcome.Chris

author: PatrickB
author_rank: Regular Contributor
timestamp: September 06, 2025, 08:51:02 am
content: Before I disassemble my oscilloscope to see the manufacturer's name and part number of this rotary knob (the one in the top left corner that's used to change many parameters), does anyone have this information?Siglent doesn't manufacture these knobs, they must come from a manufacturer somewhere in China.Do you know if this knob is soldered directly onto a circuit board or mounted on a connector?

author: tautech
author_rank: Super Contributor
timestamp: September 06, 2025, 09:24:22 am
content: Quote from: PatrickB on September 06, 2025, 08:51:02 amIt's on a PCB with the other encoders and the keypad.