The heatsink on my unit is quite hot, also. I'm thinking about putting a fan on it after I get everything working.
On Sat, Oct 10, 2009 at 9:24 AM, Greg Burnett <[email protected]> wrote: > Roy, > > The HP 5370A rear mounted heat-sink typically heats up to around 61 degrees > C. This is very hot to the touch, so I suspect your unit's temperature is > normal (unless it's running way hotter than 61 degrees C). > > The buzzing transformer might just be due to loose, vibrating laminations. > You might try tightening the transformer's bolts to see if that reduces the > buzz? > > Best, > Greg > > P.S. I agree that the rear mounted heat sinks of most other HP equipment run > significantly cooler. The models that run so hot to the touch are the > 5370A/B, 5359A, and many of the legacy HP pulse generators (from Boblingen > Division). > > > ----- Original Message ----- > From: "Roy Phillips" <[email protected]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Saturday, October 10, 2009 4:08 AM > Subject: Re: [time-nuts] 5370A > > > Hi Joe > I have a similar problem so I would be pleased to hear from you with any > useful information. The basic problem with mine is that the power supply is > suspect - it works, but there is excessive heat, much greater than any other > HP instrument that I have, from the rear mounted heat-sink, this is too hot > to hold your hand on ! There is also a very obvious buzz from the power > transformer, even when it is on "stand-by" - so I guess at worst it could be > shorted turns in the power transformer, or probably better, a faulty bridge > rectifier,or one or more of the large reservoir caps - this an early model > (1984), so perhaps it is to be suspected. I also think the performance is > not to specification, but I will check-out the perceived problem with PSU > before I investigate this matter. I am just about to start the > investigation of the prime problem. > Roy > > > > _______________________________________________ > 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.
