Author Topic: DP832 - Fan Replacement 2018  (Read 971 times)

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Offline Gandalf_Sr

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DP832 - Fan Replacement 2018
« on: March 16, 2018, 09:53:13 pm »
After working with my new DP832 this week, I decided that the fan was sooo noisy that it had to go.  I googled and found this blog/website describing how to switch the noisy Sunon Maglev ME80251v1-000C-A99 fan for a Noctua NF-R8 redux 1800; I got the fan and a 2W 27 Ohm resistor and did the change yesterday.  A few comments and then some pictures...

It's a pain to change as you have to take the PSU apart - take lots of pictures showing where all the different plugs go before unplugging everything.

The link I posted above says that the old resistor that measures the fan current (R44) is 15 \$\Omega\$ but mine was only 7.5 \$\Omega\$ which worried me a bit but he also lists the current drawn by his Noctua as 110 mA - the one I got was only 60 mA and still claims 53.3 m3/Hr.  My calcs were that 7.5 \$\Omega\$ x 0.15 A = 1.125 V (old) and 27 \$\Omega\$ x 0.06 A = 1.62 V (new) so I would have been better with a 19  \$\Omega\$ resistor but I figured that the OpAmp that was checking the voltage probably didn't care about 1.62 vs 1.125 volts so I stuck in my 27 \$\Omega\$ resistor. 

My new fan had 4 wires so I cut the plug off the old fan and connected the new fan to that 2 pin connector (black is 0V and yellow is +12V).

I put it back together and powered up, it seems to work perfectly - no failed fan messages when I turn the outputs on - and the fan is almost inaudible now - it does the short burst of full speed on start up and I can tell that it has quite some capability if it needs to move air.  I live in Michigan so the DP832 is likely going to never see more than 90 degrees F ambient and only 72 indoors.

Pictures:
Old Fan
New Fan fitted
R44 (in red box)
System Info showing no-load temp (get that detailed view by viewing the ordinary system info and then pressing buttons under screen (numbers from L to R) 1 - 3 - 2)
 

Offline taydin

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Re: DP832 - Fan Replacement 2018
« Reply #1 on: March 16, 2018, 10:00:54 pm »
Thanks for this info, my DP832A is also starting to get on my nerves with its constant fan noise. Might change mine, too, if I can find this nice fan, that is ...
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Offline Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #2 on: March 16, 2018, 11:01:45 pm »
I bought my fan from Amazon https://www.amazon.com/gp/product/B00KF7MVI2/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Just out of curiosity, what is your fan temperature with no load? (follow 1-3-2 steps above) I didn't record mine before I did the modification.
 

Offline PTR_1275

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Re: DP832 - Fan Replacement 2018
« Reply #3 on: March 17, 2018, 02:22:54 am »
Did you do anything to get the bottom half of that screen showing? (With the temperature)

My dp832 shows the first 3 lines, but it’s fw 00.01.14

 

Offline JDubU

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Re: DP832 - Fan Replacement 2018
« Reply #4 on: March 17, 2018, 05:02:50 am »
I can answer that:

Press Utility > SysInfo > M1, M3, M2
where "M1" is is the left-most button on the bottom of the display.
 
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Offline taydin

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Re: DP832 - Fan Replacement 2018
« Reply #5 on: March 19, 2018, 06:02:51 am »
Mine doesn't show temperature, either. Just device model, serial number and digital version, which is 00.01.13
Real programmers use machine code!

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Offline Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #6 on: March 19, 2018, 06:57:39 am »
When you are seeing the 3-line System Info do this...

Press M1, M3, M2 (where "M1" is is the left-most button on the bottom of the display) and the extra information will magically appear.
 

Offline taydin

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Re: DP832 - Fan Replacement 2018
« Reply #7 on: March 20, 2018, 02:05:03 pm »
Ok that worked. Immediately after turning on my 832A, the temperature is 28.9 celsius.
Real programmers use machine code!

My hobby projects http://mekatronik.org/forum
 

Offline Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #8 on: March 21, 2018, 10:13:52 am »
Cool, so you have the same temperature reading as I do.  I have run it at about a 100W and it was quiet and cool :D
 

Offline bson

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Re: DP832 - Fan Replacement 2018
« Reply #9 on: March 21, 2018, 02:30:43 pm »
Interesting, my DP832 non-A doesn't have the temperature readout...

Edit: never mind, I did a firmware update to 1.14 and I now have it, too.
« Last Edit: March 21, 2018, 03:33:20 pm by bson »
 

Online Wolfgang

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Re: DP832 - Fan Replacement 2018
« Reply #10 on: September 30, 2018, 10:59:00 pm »
I started an opinion poll about the RIGOLs

http://www.eevblog.com/forum/testgear/what-is-your-opinion-of-the-quality-of-the-rigol-dp832(a)/msg1856247/#top

Please give a rating of your own experiences with this stuff - good or bad, whatever it may be.

Thanks
  Wolfgang
 


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