Charles,
On 02/02/14 21:58, Charles Steinmetz wrote:
Magnus wrote:
Also, the fan-noise did not change a lot by drying to damp the top
lid, so it seems the fan emits it mostly as a direct mode.
The older unit has a high hiss to its fan
That is what I have observed, as well. The noise is mostly fan blade
noise and some bearing noise coming directly out the back of the unit.
I did not find that the inlet vents were a significant source of noise,
or that increasing the inlet area caused the fan itself to run quieter.
You probably wouldn't notice a substantial noise reduction until you got
down to a fan with a 15-18 dBA noise rating, and that would move so
little air that you'd probably fry the counter. The Papst fan has about
the same noise rating as the original Delta, so I wouldn't expect
changing the fan to have a big effect on the amount of noise (but, as
you say, the noise spectrum may be different).
Well, with a ball-bearing noise it's much worse than fan-blade hiss.
Fan-blade hiss is result of running at stupid speeds without achieving much.
Anyway, I will probably get a new fan so I might as well get two.
Finding out why the UPS won't start and parts of my rig with it is
however higher up on the to-do list now that I figured that much out...
and more clean-up.
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
