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 2When 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!
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.