Products > Test Equipment
Keysight 34461A Fan Noise
rernexy:
Welp, it's definitely the fan: https://drive.google.com/file/d/1-zcULG_mnfcH52MxQbIPaJsYwtBfZU2V
Is the new sound just a sign that the fan is broken in now? :-DD
rernexy:
Dismantled the fan. Surprised it uses 2 bearings.
rernexy:
Replaced the fan with a Multicomp MC002684, which is actually a Sunon MF40100V2-1000U-A99.
Spectrogram of the new sound is attached.
NoisyBoy:
Good to see you got it repaired, it sounds like my 34461A with the new fan.
I know there has been some complaint about the fan noise on the Truevolt DMMs, but both of mine have been very quiet. They are perhaps my quietest fanned equipment in my lab.
tangram:
My 34465A was making one hell of a racket. It's just over three years old now and never missed a beat, but it was howling like a husky in heat.
Bought a Noctua NF-A4x10 5V, Premium Quiet Fan, 5V Version (40x10mm, Brown) from amazon and installed it. It didn't come with the molex two-pin connector that the board uses, so just chopped the wires off the old fan and spliced them together.
The one I bought from Amazon was the 3 pin version. I'm not even sure that there is a two pin version of this fan, but just chopped the third (yellow) wire short and capped it with a little heat-shrink before soldering and heat shrinking the +ve and -ve.
Works a treat, blows a good amount of air and is barely audible. Meter needed a good hoover inside anyway. it was getting a bit dusty in there.
Happiness is restored ;D
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