Author Topic: DP832 - Fan Replacement 2018  (Read 1776 times)

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Online Gandalf_Sr

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DP832 - Fan Replacement 2018
« on: March 16, 2018, 10:53:13 am »
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)
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Offline taydin

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Re: DP832 - Fan Replacement 2018
« Reply #1 on: March 16, 2018, 11:00:54 am »
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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Online Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #2 on: March 16, 2018, 12:01:45 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.
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Offline PTR_1275

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Re: DP832 - Fan Replacement 2018
« Reply #3 on: March 16, 2018, 03:22:54 pm »
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 16, 2018, 06:02:50 pm »
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 18, 2018, 07:02:51 pm »
Mine doesn't show temperature, either. Just device model, serial number and digital version, which is 00.01.13
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Online Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #6 on: March 18, 2018, 07:57:39 pm »
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.
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Offline taydin

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Re: DP832 - Fan Replacement 2018
« Reply #7 on: March 20, 2018, 03:05:03 am »
Ok that worked. Immediately after turning on my 832A, the temperature is 28.9 celsius.
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Online Gandalf_Sr

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Re: DP832 - Fan Replacement 2018
« Reply #8 on: March 20, 2018, 11:13:52 pm »
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
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Offline bson

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Re: DP832 - Fan Replacement 2018
« Reply #9 on: March 21, 2018, 03:30:43 am »
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, 04:33:20 am by bson »
 

Offline Wolfgang

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Re: DP832 - Fan Replacement 2018
« Reply #10 on: September 30, 2018, 12:59:00 pm »
I started an opinion poll about the RIGOLs

https://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
 

Offline Pinkus

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Re: DP832 - Fan Replacement 2018
« Reply #11 on: August 13, 2019, 01:31:58 pm »
I have finally found time to replace the fan of my DP832.... the volume of the fan noise was always annoying me.
Though a surprise was waiting:

I wanted to replace it with the above mentioned Noctua, thus I purchased one for about 10 Euros.
But during the conversion I noticed that it was not necessary at all, these 10 Euros can be saved.

1) The Noctua allegedly has the same air performance as the original Sunon fan, but subjectively it produces much less air. It rotates with 1600 rpm where the original Sunon runs with 3200 rpm.

2) The fan cover on the back of the DP832 covers approx. 50% of the surface, i.e. the fan has to produce an unnecessary amount of power to squeeze the air out of the small openings.

Here I thought, to compensate the lower air pressure of the Noctua I would just remove the fan cover of the back of the DP832.
Therefore I separated the fan cover with a Dremel and replaced it with a thin grille cover. The reason was so that the Noctua fan could produce about the same air performance (without the fan cover) as the Sunon (with the fan cover) due to the lower air resistance.

First try: original Sunon fan without the fan cover ..... and ..... whow! The whole unit is 10dB quieter, so it's only half as loud as before! Just by removing and replacing the fan cover. Probably due to the eliminated turbulence at the sharp corners of the cover and of course of the removed extra resistance.

2nd step: Since the air resistance now has become much smaller by removing the cover, the original fan can now turn slower for the same amount of air. A 47 Ohm resistor in series makes the DP832 very very quiet with approximately the same amount of air running through the electronics. In fact, it is that quiet now, that the DP832s chirping display illumination is disturbing.  :palm:

Well, since I had the 90mm Noctua fan already purchased, I now installed it together with the 3D printed adapter from Thingiverse I already printed. Result: the DP832 is now almost inaudible (but the display).
Note: since this fan needs less power and the DP832 gives an error message, I had to connect 220 Ohm in parallel to the fan.

So, long story short: save your money, you don't need a new fan. It is sufficient to remove (Dremel) the fan cover to lower the volume already by 50%. If you want to make it even quieter, solder a 47 Ohm resistor in series with the fan (you might need to connect the mentioned 220 Ohm resistor in parallel to the fan connector).

Edit:
Temperature:
(see post above how to switch on the temperature display).
  • Idle (no load): 30.5°C after some time
  • 90W load (* see below): 76°C after 2 hours
    after switchoff the load (=idle) and 5 min. waiting time: back to 55°C



*= I set channel 1 and channel 2 to 15V and 3.2A; I then connected them serially (30V, 3.2A max) and used an electronic load to draw 3A. I let it run for >2 hours.
« Last Edit: August 13, 2019, 09:27:25 pm by Pinkus »
 
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Offline Vaiti

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Re: DP832 - Fan Replacement 2018
« Reply #12 on: August 14, 2019, 07:16:11 am »
I wanted to replace it with the above mentioned Noctua, thus I purchased one for about 10 Euros.
Little confused. The fan mentioned here is a 80mm, Noctua NF-R8 redux-1800. If I understood correctly, this fan doesn't require an adapter as it is the same size as the Sunon already in the rear of the DP832.

But you have a 90mm that needs the adapter? Which fan model are you using?
 

Offline Pinkus

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Re: DP832 - Fan Replacement 2018
« Reply #13 on: August 14, 2019, 07:51:12 am »
Sorry for the confusion. I purchased a Noctua NF-B9 redux-1600 because it was mentioned in another DP832 thread.
This is a 90mm fan where you need an adapter for.

But as I said above, today I would rather just remove the original fan cover and just buy a 1$ replacement for the cover (eg. here: https://www.aliexpress.com/item/32888214967.html) and then use the existing fan.

Other:
Link to thingiverse: https://www.thingiverse.com/thing:2994987

Check also this link regarding noise / airflow of different fan grill (cover) styles: https://www.pugetsystems.com/labs/articles/Effects-of-Grill-Patterns-on-Fan-Performance-Noise-107/. After reading this, you will stay away of any sort of fan grill but the wire-grill.
 
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