Someday , someone will get bored with everything
else and give it a try, you know, in their spare time.
The time when these counter were new was a long while ago.
Back then an amplifier chip with 500MHZ BW was a
much bigger deal than it is in 2016.
...but spare time is permanently on backorder .... :)
Dimitri
At 06:15 AM 1/24/2016, Bob Camp wrote:
Hi
Back when these counters (5345, 5370, 5335) all were new, the inputs were
the weak link on all of them. There were known
âdonât do thatâ things on the line
that would blow out each of them. Regardless of
the level of care and yelling, inputs
blew on a fairly regular basis. Probably 10% of the counters went back
for repair over a 5 year period. It was always a
âswap out the entire boardâ sort
of repair and never was under $1K. We regularly
spent the price of a new counter
each year on repairs. If there had been an easy
way to fix them, (or even to just
pay $500 for the chip) we would have done it.
Bob
> On Jan 24, 2016, at 8:34 AM, Dale Cannon <dalec...@cfl.rr.com> wrote:
>
> Funny,
>
> A friend asked me if I could replicate the front end for a 5370A, a many
> years back. I related to him that replicating the input chip was not a
> trivial task. His 5370A had been used (by someone else) for direct testing
> of controlled-motion DC motors and the front end had obviously been
> overstressed by voltage spiking. At the time, I had considered replicating
> the front-end probe circuit of a K100D logic analyzer: FET diff. pair
> followed by an ECL 10216 line driver. Obviously most daughterboard or dead
> bug modification approaches have downsides; in the end I just couldn't cut
> up the HP front end and told him to search for a more qualified repair
> facility.
>
> BAMA boat anchors has the K100D manual and probe schematic.
>
> Dale Cannon KS4FA
>
>
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mathew
> Breton
> Sent: Friday, January 22, 2016 5:15 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] HP5370B & HP5345B Front-End IC Redesign Effort
>
> I was gifted an HP 5370B with the usual problem: front-end problems,
> probably due to overstress. It is currently up and running again with a set
> of 5345A series A3/A4 boards as I wasn't able to get a cheap pair of
> 5088-706x hybrid ICs.
> This sounds like a common problem. As a
result, I'm designing an open-source
> drop-in (hopefully) replacement. My hat is off to the original IC designer,
> as it is not a trivial effort due to the wide input signal common-mode
> range, and very tight trigger timing requirements. Other items (like the
> E-ECL) output) are also adding a bit of extra effort.
> I'm hoping that someone(s) might be interested in working with me on it. I
> would like to have my assumptions and math checked before I start the
> detailed design phase, and perhaps contribute some better ideas.
> In addition, it would be really helpful if
someone could run a few rise-time
> dispersion tests on an instrument with a working "B"-series A3/A4 PCB set
> (my unit obviously doesn't qualify).
> Regards,
> Mat Breton
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