Products > Test Equipment
DP832 - Fan Replacement 2018
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JDubU:
I tried turning the fan so that it blew inward and it definitely lowers the internal temperatures compared to the fan blowing outward.
However, it is also a bit louder when blowing inward and adds a high pitch whine, caused by the wire fan guard, which I find to be nerve-wracking.  I switched it back to blowing outward and it is currently the quietest fanned instrument on my bench.  I figure that I can always turn it back around if the need arises.  Meanwhile, I will leave the DP832 over temperature protection (OTP) enabled.
klausES:

--- Quote from: JDubU on March 26, 2020, 08:30:34 pm ---...However, it is also a bit louder when blowing inward and adds a high pitch whine, caused by the wire fan guard, which I find to be nerve-wracking...
--- End quote ---

This is the typical problem when formations are close to the suction side.
This can range from stalling noises to vibrations of the air column (between the obstacle and the wings).

Try to place the fan further in with distances into the housing (preferably rubber ones for decoupling,
10mm may be enough), or you can try to move the grid 10mm further out (with spacers).
eutectique:
Got my DP832 recently and stumbled across this thread.

Just for the record, Noctua has two versions of NF-R8 redux-1800 fans: PWM (4-pin) and non-PWM (3-pin). They differ in current consumption, other characteristics are the same.

Sunon Maglev ME80251145 mANF-R8 redux-1800110 mANF-R8 redux-1800 PWM60 mA
Non-PWM version is quite close electrically to the original fan and probably wouldn't need a different resistor.
JDubU:

--- Quote from: eutectique on April 02, 2020, 05:42:51 pm ---Got my DP832 recently and stumbled across this thread.

Just for the record, Noctua has two versions of NF-R8 redux-1800 fans: PWM (4-pin) and non-PWM (3-pin). They differ in current consumption, other characteristics are the same.

Sunon Maglev ME80251145 mANF-R8 redux-1800110 mANF-R8 redux-1800 PWM60 mA
Non-PWM version is quite close electrically to the original fan and probably wouldn't need a different resistor.

--- End quote ---

I used the Noctua 3 pin version.  Measured current draw in open air was 95mA at 12V.  The specs are for max current draw. 
Didn't measure the existing Sunon current draw, but here is a video where it was measured in open air to be about 160 mA:   https://www.youtube.com/watch?v=b0kTXX8zXSo.   (time 3:35)

I did not try the Noctua in the DP832 without the parallel 250 ohm resistor.
timber23:

--- Quote from: JDubU on April 02, 2020, 06:14:32 pm ---I did not try the Noctua in the DP832 without the parallel 250 ohm resistor.

--- End quote ---
I tried it. It doesn't work. When you switch on a channel than it will be automatically disabled. Furthermore the system test procedure shows that fan fails. That is why I added the parallel resistor. I have the 3-pin version as well.
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