[time-nuts] 5370A

Roy Phillips phill.r1 at btinternet.com
Sat Oct 10 10:08:35 UTC 2009

 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.

----- Original Message ----- 
From: "Joseph Gray" <jgray at zianet.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, October 10, 2009 5:46 AM
Subject: [time-nuts] 5370A

>I just got a 5370A locally and am going through the performance
> checks. Things are not as they should be. Is there someone who knows
> this unit intimately who would be willing to help me off list?
> Joe Gray
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