jgray at zianet.com
Sat Oct 10 22:40:02 UTC 2009
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 <djl at montana.com> 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 <gbusg at comcast.net> wrote:
>>> The HP 5370A rear mounted heat-sink typically heats up to around 61
>>> C. This is very hot to the touch, so I suspect your unit's temperature
>>> normal (unless it's running way hotter than 61 degrees C).
>>> The buzzing transformer might just be due to loose, vibrating
>>> You might try tightening the transformer's bolts to see if that reduces
>>> P.S. I agree that the rear mounted heat sinks of most other HP equipment
>>> 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
>>> ----- Original Message -----
>>> From: "Roy Phillips" <phill.r1 at btinternet.com>
>>> To: "Discussion of precise time and frequency measurement"
>>> <time-nuts at febo.com>
>>> 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
>>> suspect - it works, but there is excessive heat, much greater than any
>>> HP instrument that I have, from the rear mounted heat-sink, this is too
>>> 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
>>> rectifier,or one or more of the large reservoir caps - this an early
>>> (1984), so perhaps it is to be suspected. I also think the performance
>>> not to specification, but I will check-out the perceived problem with
>>> before I investigate this matter. I am just about to start the
>>> investigation of the prime problem.
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> Dr. Don Latham AJ7LL
> Six Mile Systems LLP
> 17850 Six Mile Road
> POB 134
> Huson, MT, 59846
> VOX 406-626-4304
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