i guess I'm lucky the one that is my day to day user on the bench the PS's are quiet. Not sure but acoustic coupling can very between units. I was one day forced to find an alternative fan, cant remember what I came up with but it is quieter and still pulls the same CFM or bit better, verified with a Hot Wire Anemometer.
but then again the switcher sound may be my ears are now > 50 yrs old. or maybe when the 5345A the 8662A, and a few others are running it all just blends together. the front end parts are, but when I need < 100 or 200 Mhz I usually use something newer, over 100 or so, I use the remote head. Now there is something with hard to get parts !. Other then the ability to get that SMA or N depending on the head a few inches away. I forget the follow on uWave model, 1/2 rack width .. but working the price is still a lot more. On Sat, Dec 25, 2010 at 8:31 PM, Charles P. Steinmetz <[email protected]> wrote: > Burt wrote: > >> What is the groups thoughts on the HP 5345A? > > I have several and like them, aside from the screaming switching power > supplies that will give you a splitting headache in 5-10 minutes. Even the > very loud fan (as loud as a 3585A spectrum analyzer, which sounds like a 757 > taking off) doesn't mask the awful switcher din. There are two switchers > (+/- 5 V), and the oscillators are not synchronized, so they beat with each > other. Unquestionably the most obnoxious noisemakers I've ever experienced. > > Some parts are getting hard to come by. > > Speaking of the fan, note that HP strongly recommends removing the air > filters, if they are still present. > > Best regards, > > Charles > > > > > > _______________________________________________ > 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.
