It is important to remember that the fans specified in most of this equipment are sized so that the instrument can operate safely, in a rack full of equipment, at the maximum temperature rating for the instrument.
If you plan to run at a comfortable room temperature, you can usually get by with a much smaller fan. It might be nice to leave a label somewhere that says what you did, so the next owner won't be unpleasantly surprised by it failing in his desert tent. -Chuck Harris Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > On 13 Jul 2016 08:31, "Charles Steinmetz" <[email protected]> wrote: > >> An external fan blowing on the heatsink keeps my 5370s nice and cool, for > about $10 each. > > So more noise. > >> *if the counters were operated 24/7/365*. I sometimes take data for a > few months straight, but very, very far from 24/7/365 on average. So for > me, break-even would be more like 50 years. > > I don't suppose Poul's main motivation is to reduce his electric bill. > >> Speaking of fan noise -- you can't really get away with replacing the > internal fan with one that moves less air, so it is hard to find a > replacement that generates significantly less noise. If you find one, > please share the make and model -- all 5370 owners would love to know. >> >> Best regards, >> >> Charles > > Surely one of the main advantages of the SMPS route is the higher > efficiently means less cooling air is required. That means less noise. > > I often here of people replacing fans with quiter ones, but I suspect that > all they really do is reduce the airflow. I believe that most of the noise > one hears is the movement of the air. From what I have read, sleve bearing > fans make a bit less noise than ball bearings fans. However, although the > MTBF of both types is similar at 20 degree C, the MTBF of sleve bearing > fans decreases quite a bit with only a modest increase in temperature. > > Dave. > _______________________________________________ > 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. > _______________________________________________ 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.
