[time-nuts] HP5370 power supply measurements

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Jul 15 13:55:42 EDT 2016

In message <CANy2iXq6ONvriDoFgNFkEBQjDKntP7t8KuE7BOUpxJWLCuxLsw at mail.gmail.com>
, "William H. Fite" writes:
>David Kirkby scripsit:
>> I often here of people replacing fans with quiter ones, but I suspect that
>> all they really do is reduce the airflow.
>Not necessarily, Dave. The Austrian company, Noctua, for one, makes
>extremely quiet fans with excellent airflow.

... at zero pressure differential, which is easy to do (Think: ceiling fan).

The hard part is to make fans silently move air when they also have
to build up pressure to get the air to move places.

This is where the gap between the wings and the frame must be minimized,
or the pressure will leak out through it.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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