Hi Since the front end chips are mixed signal ASIC’s, it will take more than a bit of time to replace them directly. Re-doing the entire front panel board is the most likely way to “fix” the problem. The question is - why do that at all? Just do a PC instrument that does the same thing as the counter with way less effort…..
Bob > On Jan 24, 2016, at 6:02 PM, Dimitri.p <dimi...@dotp.com> wrote: > > 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 >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> > ----- >> > No virus found in this message. >> > Checked by AVG - www.avg.com >> > Version: 2016.0.7294 / Virus Database: 4492/11420 - Release Date: 01/17/16 >> > >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.