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| Fan replacement on the Rigol DP832 |
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| ElektronikLabor:
Hello, Some weeks ago I received my power supply Rigol DP832 and I was surprised how loud it is. I decided to change the fan against a quieter one; now I would like to exchange experience with you :) Sorry for the bad sound quality. After modification I can’t almost hear any noise of the power supply. I don’t follow this forum, so I don’t know if there exists another solution for that problem. That’s just my way of solving it. In addition to my explanation you can take a look at some photos here. First I ordered a quiet 80mm fan: Be Quiet Silent Wings 2 When I received the fan I opened the case of the DP832 and I was very amazed to see two fans! One big fan on the back and one smaller one on the right side of the case! I have watched Daves video where he tears down the power supply but there was only one fan, not two! :scared: The second smaller fan makes roughly the same noise as the bigger one, so I immediately bought a second quieter one. I can’t understand why Rigol decided to build in a second fan. I already know about the heat problems of this Supply; I also watched Daves video about this problem. But I don’t understand how the second fan can help! It is blowing directly on the transformer and it is half covered by the case! The two fans are connected in parallel within one connector. Some specs of the original fans: 1st original fan: Model No: Sunon MagLev ME80251V1-0000-A99 Size: 80mm Noise: 33 dBA Speed: 3200 RPM Air Flow: 41 CFM 2nd original fan: Model No: Sunon MagLev ME50151V3-000C-A99 Size: 50mm Noise: 30 dBA Speed: 4900 RPM Air Flow: 13 CFM Some specs of the new fans: 1st fan: Model No: be quieq! Silent Wings 2 Size: 80mm Noise: 14.5 dBA Speed: 2000 RPM Air Flow: 26 CFM 2nd fan: Model No: Sunon MagLev HA50151V4-0000-999 Size: 50mm Noise: 17 dBA Speed: 3200 RPM Air Flow: 7.7 CFM You can see that the new fans are much quieter but also weaker as the original ones! Overall the new fans are 40% weaker! I worked some time with the modified power supply but I didn’t mention any problems even with bigger loads over a longer period of time. To verify the new fans I measured the temperature of the heat sink of the linear voltage regulator which became so hot in the past. I think this regulator powers the internal system of the DP832. I measured it before and after the replacement of the fans, during the measurement all outputs were switched off. You can see the measurement setup on the pictures I mentioned vefore. Below you can find the graph of the heat build-up. I turned on the supply in t=10s switched it off in t=500s. You can see that with the new fans the heat sink gets 8°C warmer after 490s. I will definitely keep a close eye on the heat of my power supply, but like I mentioned before I couldn’t see any problems until now. :) |
| HighVoltage:
I just bought a LeCroy 354 scope and it is loud, like too loud 52 dB(A) ! But then, it has a huge airflow coming out and I might do not get away with a lower airflow fan. |
| peter.mitchell:
The noise from the DP832 fan, is from the fan itself, the "vvirrrrrr" kind of noise. Changing the fan to a lower RPM one just masks the problem - it moves the vibrational noise of the fan into a frequency range where it is hidden behind the sound of the turbulence. You should be able to get a fan that doesn't make the "vvirrrrrr" noise but still moves the air. Be this due to better bearings, better balancing of the prop, a higher number of poles so the motors movement is smoother or tighter manufacturing tolerances. |
| lapm:
I suggest you seriously monitor device after those new fans. Their air flow is much lower then original ones and that may create heat issues... If your lucky, original ones were overpowered and new ones are enough, but anyways keep eye out on temperatures... |
| peter.mitchell:
here are some fans i would suggest in order of preference to replace the sunon 50 mm; GELID Silent 5 50mm 12.9CFM, 23dB(A), 4000RPM nom. MTBF >50kH Deepcool SF-500 50mm 9.6CFM, 23dB(A), 4500RPM nom. MTBF >??? and to replace the sunon 80 mm; Noctua NF-R8 80mm Fan 31.2CFM, 17dB(A), 1800RPM nom. MTBF >150kH Blacknoise NB-BlackSilentPRO P-P 80mm 31.7CFM, 18dB(A), 2000 RPM nom. MTBF >100kH |
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