Steve, > I must have lost the plot here but I thought that was only > for HPIB data.
By far not! PLOTTER does a lot to everything than can be pressed into ASCII data column files. > How are you collecting the data? That has been done with a quick and dirty script for my EZGPIB utility (which handles serial communication and some other goodies as well). I have just included this script as "Z3805.488" to the examples. Don't accuse me that I did not have warned you: PLOTTER is written in the P-language while EZGPIB (which is written in the P-language itself) executes scripts in the P-language, P-square if you like. Better get on rubber gloves before you touch anything of it, hi. 73s Ulrich, DF6JB > -----Ursprungliche Nachricht----- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Steve Rooke > Gesendet: Mittwoch, 17. Juni 2009 11:29 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] Z3805 initial behaviour after power up > > > Ulrich, > > I must have lost the plot here but I thought that was only > for HPIB data. How are you collecting the data? > > 73, > Steve > > 2009/6/17 Ulrich Bangert <df...@ulrich-bangert.de>: > > Steve, > > > > my PLOTTER utility. I thought you did already try it out? > > > > 73s Ulrich, DF6JB > > > >> -----Ursprungliche Nachricht----- > >> Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] > >> Im Auftrag von Steve Rooke > >> Gesendet: Mittwoch, 17. Juni 2009 11:03 > >> An: Discussion of precise time and frequency measurement > >> Betreff: Re: [time-nuts] Z3805 initial behaviour after power up > >> > >> > >> Ulrich, > >> > >> What are you using to produce the graph you attached please? > >> > >> 73, > >> Steve > >> > >> 2009/6/17 Ulrich Bangert <df...@ulrich-bangert.de>: > >> > Gents, > >> > > >> > yesterday I received the Z3805 that I had bought from > >> fluke.I on eBay > >> > and immediately put it to work. I recorded the EFC value > as well as > >> > the PPS TI value over about 20 hours. Attached is the > graph of thes > >> > two values. > >> > > >> > I interprete this graph in this way: > >> > > >> > 1) Immediately after power up (perhaps up to the end of the site > >> > survey) the regulation loop seems to work with a very short time > >> > constant which is able to bring the PPS TI close to zero > >> although the > >> > OCXO has lots of drift at this time. > >> > > >> > 2) Then the loop time constant seems to switch to a > >> significant higher > >> > value which does not keep up with the oscillator's drift, > >> which leads > >> > to the negative excursion of nearly 500 ns. > >> > > >> > 3) This seems to be too much for the regulation which leads to > >> > switching back to the short time constant and to bring the > >> PPS TI back > >> > to near zero and to return to the longer time constant again... > >> > > >> > 4) ...which lets the procedure repeat again and again: > >> Drift to -500 > >> > ns and pullback. > >> > > >> > 5) Note that I thought it was a kind of malfunction and send a > >> > :system:preset command to the device after the last > negative PPS TI > >> > spike. The result was, that the total procedure > repeated: About 2 > >> > hours of PPS TI close to zero then again the drift and pullback > >> > procedure however with a reduced drift rate. > >> > > >> > 6) After 11 hours or so the regulation loop's time constant > >> seems to > >> > match the OCXO's drift and a "real" lock of the pll > seems to take > >> > place. (The lock led had been on already hours ago...) > >> > > >> > Since I do not have an manual for the Z3805: Can any of > you Z3801 > >> > owners second this behaviour to be normal or would you > >> think that it > >> > is kind of special for the Z3805 or even a real > malfunction (in the > >> > sense that the OCXO's drift is above the specs in the beginning)? > >> > > >> > Best regards > >> > Ulrich Bangert > >> > > >> > Ulrich Bangert > >> > www.ulrich-bangert.de > >> > Ortholzer Weg 1 > >> > 27243 Gross Ippener > >> > > >> > _______________________________________________ > >> > 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. > >> > > >> > >> > >> > >> -- > >> Steve Rooke - ZL3TUV & G8KVD & JAKDTTNW > >> A man with one clock knows what time it is; > >> A man with two clocks is never quite sure. > >> > >> _______________________________________________ > >> 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. > > > > > > -- > Steve Rooke - ZL3TUV & G8KVD & JAKDTTNW > A man with one clock knows what time it is; > A man with two clocks is never quite sure. > > _______________________________________________ > 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.