[time-nuts] 5370A

[Don Latham]

oh yeah-cool :-)
Don

Joseph Gray
> 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:
>>>> 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
>> www.sixmilesystems.com
>>
>>
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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
www.sixmilesystems.com