Greg
Thank you - that's good news re temperature - I will check the transformer
for loose laminations. I am collecting the various information from other's
regarding calibration/ performance.
Roy
----- Original Message -----
From: "Greg Burnett" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Saturday, October 10, 2009 4:24 PM
Subject: Re: [time-nuts] 5370A
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
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