[time-nuts] 5370A

[Don Latham]

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:
>> 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" <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
>> 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
>>
>>
>>
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>>
>
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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
www.lightningforensics.com
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