[time-nuts] Basic HP 5334A question - Ebay stuff

[Robert Atkinson]

The other thing to check is "proper" dealers. Here in the UK I can buy some kit from highly reptutable dealers with 30 day warranty and manuals inculded for a fraction of what some ebay sellers are starting at. For example a 5316B, obviously ex a recent disposal auction (Lot No. stickers still visible) for more than twice what a dealer is selling them for. 
 
Robert G8RPI.

--- On Wed, 5/1/11, Bob Camp <lists at rtty.us> wrote:


From: Bob Camp <lists at rtty.us>
Subject: Re: [time-nuts] Basic HP 5334A question
To: richard at karlquist.com, "'Discussion of precise time and frequency measurement'" <time-nuts at febo.com>
Date: Wednesday, 5 January, 2011, 19:40


Hi

There's some subtle distinctions I had not realized were there. All I've
ever seen are the "B" model.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Rick Karlquist
Sent: Wednesday, January 05, 2011 2:37 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Basic HP 5334A question

Bob Camp wrote:
> Hi
>
> Other than the normal issues with blown inputs, the 5334 is a pretty
> rugged
> beast. It's not got a whole lot of crazy stuff inside it. It does have
> some
> custom IC's and firmware.

Actually, it has crazy stuff IMHO.  The controller is broken up
into three separate microprocessors because of various historical
accidents.  The custom IC's are somewhat "crazy" as well in that
the circuits could have been replaced with OTS IC's, which is
what I did in the 5334B.  I unfortunately inherited the 3 uP's
and couldn't design them out.  The power supply in the 5334A was also
weird in that the oven warmup current would pull it way down in
voltage, below its spec.  The counter accidentally worked anyway,
but if you were troubleshooting, you might think it was broken.
The PC board had a weird single point ground, instead of a ground
plane as in the 5334B.

Rick Karlquist N6RK
Project Manager HP 5334B, circa 1987


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