Gentlemem, pardon for the delayed answer, I had some extreme busy days the last week.
> The floating logic is reset by the LM2925 5V regulator reset > output. There is no connection to this reset line aprt from > the Gate array reset > input and the micro (80196) reset input. Yes, U553 on page 9-15 has this reset output which is called XPONRST. After it has passed the lowpass R503/C504 on page 9-13 (upper left) it enters U500 and U501. I observe this 7 kHz reset signal RIGHT from the lowpass even if I lift up the voltage regulator's reset output pin. Best regards Ulrich Bangert > -----Ursprungliche Nachricht----- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bruce Griffiths > Gesendet: Dienstag, 11. Dezember 2012 22:46 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] OT: Question on dead HP34401 > > > It only resets the earth referenced micro (8051) on power up and when > pulses on the optocoupler output arent present. > There is no other connection to the reset pin of this micro. > > The floating logic is reset by the LM2925 5V regulator reset > output. There is no connection to this reset line aprt from > the Gate array reset > input and the micro (80196) reset input. > > The relay drivers are reset by a 80196 output pin. > > The display logic is reset by another 90196 output pin. > > Bruce > > paul swed wrote: > > OK but why would it tie to the reset line? > > > > On Tue, Dec 11, 2012 at 3:48 PM, Marco IK1ODO > -2<ik1...@spin-it.com> > > wrote: > > > > > >> At 21:40 11/12/2012, you wrote: > >> > >> > >>> Two comments the manuals available on agilent > >>> What on earth is a crossguard? > >>> > >>> > >> Data exchange between a floating, guarded circuit and a ground > >> referenced one? > >> > >> Marco IK1ODO > >> > >> > >> > >> > >> ______________________________**_________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to https://www.febo.com/cgi-bin/** > >> > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listi > >> nfo/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.