So now all your HP equipment looks like a 1950's parking lot, huh? On Sat, Oct 10, 2009 at 4:16 PM, Don Latham <[email protected]> wrote: > Hi All: I put extended fins on my 1980's Hp equipment by drilling and > tapping the existing sink. I used the white heatsink grease from Radio > Shack to help. > Don Latham > > Joseph Gray >> 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. >> > > > -- > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > www.lightningforensics.com > www.sixmilesystems.com > > > _______________________________________________ > 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.
