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| 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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