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Keysight 34461A Fan Noise

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Ahrenp:
Hi,

Long timer lurker, first time poster. I just got a Keysight 34461A and there seems to be quite a lot of fan noise, contrary to the reviews and posts I've seen about it. Along with what I would call typical 'fan noise/white noise' there also seems to be a louder low frequency hum/buzz. I'm just curious if this is typical for this meter? It's difficult to describe and when I tried to record the sound the hum didn't really pick up. It is somewhat annoying and louder than my nearby PC and Rigol DS1054z.

TheSteve:
Hmm, that is odd - I have had a DS1054Z and it is much louder then my 34461A

orbiter:
I don't believe its anything to worry about, I have the 34465A and it's fan is definitely not so quiet, it also has a rather audible whine to it as well.

DaJMasta:
Fans can actually differ a bit in noise even of the same type, and it takes a very small amount of gunk to change it further.  If the manufacturer isn't making big claims about it being quiet, then there may not be a lot of checking done to be sure of it.

Fans do get noisier if the airflow is obstructed though, so if you have a bird's nest of cables in front of it, that could be contributing.  As for picking it up on a mic, make sure the gain is up and hold it close to the fan, if you can hear it at a distance, odds are good even a cheap mic can pick it up alright.

Don't have a 34461, but do have one on the way, maybe I can report back this week to see if mine is the same (hoping for quiet!  :))

Performa01:

--- Quote from: DaJMasta on January 18, 2017, 01:11:57 am ---Don't have a 34461, but do have one on the way, maybe I can report back this week to see if mine is the same (hoping for quiet!  :))

--- End quote ---

I guess most of us hope for quiet instruments, rather than getting mini vacuum cleaners.
Unfortunately it appears most T&M manufacturers don't care about our hopes (cheap tiny fans, non-optimized airflow, no temperature control) ...

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