Products > Test Equipment

Keysight 34461A Fan Noise

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BVH:
I just installed the Noctua NF-A4x-10, 5 Volt, 40mm quiet fan in my 34465A.  Using a 5 Volt reference, I got the following VDC readings before and after:  Before 5.00062-5.00063.  After 5.00061-5.00062.  The very irritating fan "tone" or "pitch" is completely gone and the air movement noise is about the same.  I can now keep my meter on between 1-3 hour uses.  Definitely worth the change.

Messtechniker:
Now that's some news! 8) Thank you. :-+
A Noctua NF-A4x-10 for my 34465A has been on
my shopping list for long time now. Since I can not check the
calibration after changing the fan, I was quite hesitant.
In view of your results, I will now go ahead.

Gandalf_Sr:

--- Quote from: BVH on December 08, 2019, 12:17:12 am ---I just installed the Noctua NF-A4x-10, 5 Volt, 40mm quiet fan in my 34465A.  Using a 5 Volt reference, I got the following VDC readings before and after:  Before 5.00062-5.00063.  After 5.00061-5.00062.  The very irritating fan "tone" or "pitch" is completely gone and the air movement noise is about the same.  I can now keep my meter on between 1-3 hour uses.  Definitely worth the change.

--- End quote ---
I have a 34461A that's:
a) Slightly noisier that I'd like
b) Recently calibrated
c) Well out of warranty

I might consider the fan replacement too.  I can get it from Amazon here https://www.amazon.com/Noctua-Cooling-Bearing-NF-A4X10-FLX-5V/dp/B00NEMGCIA

Is that the right one and do you have any other suggestions for vendors?

iMo:
Sometimes it is enough to wire a 22-68ohm resistor in series with the fan's Vcc such the high pitch disappears (lower rpm).

Messtechniker:
Well, its not any high pitch which is annoying.
Rather, its the howling sound the stock fan makes. :palm:

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