[time-nuts] HP5370 power supply measurements
William H. Fite
omniryx at gmail.com
Fri Jul 15 15:52:52 EDT 2016
That is, in fact, precisely how you do it.
On Friday, July 15, 2016, Orin Eman <orin.eman at gmail.com> wrote:
> On Fri, Jul 15, 2016 at 10:55 AM, Poul-Henning Kamp <phk at phk.freebsd.dk
> > --------
> > 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).
> You have to look at the curves on the data sheet that shows air flow vs.
> static pressure (and be careful about the static pressure scale). I found
> that a 'quiet' fan would often be flowing one tenth as much air as the
> original fan at the static pressure at which the original fan was rated.
> In a given instrument, you may get away with the quieter fan, but how would
> you tell other than putting a thermometer inside and making a before/after
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