Tom, can you explain what exactly you understand by "a large coil of wire"?
Did you make the easurements on the Junghans with a DIY sensor or with one of the commercially available? I have made some basic tests with a coil coming from a loudspeaker's cross over network. It has a few hundred windings, R=1.3 Ohms, 2.3 mH, but the only thing i receive with this coil is a strong 10 Mhz signal...perhaps no real surprise in a time nuts laboratory. Best regards Ulrich > -----Ursprungliche Nachricht----- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Tom Van Baak > Gesendet: Dienstag, 15. April 2014 15:53 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] Measuring the accurcy of a wrist watch > > > > Some research has shown that there is an comparable instrument for > > ANALOG quarz watches. As far as I understand it does not > try to detect > > the quarz frequency but detects magnetic pulses from the > step motors > > that move the hands of the watch. > > > > Has anyone of you ever tried to do this in a time nuts laboratory? > > Ulrich, > > Yes, this works well, for both those with seconds hands (one > magnetic pulse per second) and those with only minute/hour > hands (one or two steps per minute). A large coil of wire is > all you need. Have a look at the watch timing tools and > sensors at http://www.bmumford.com/microset.html or > http://www.bmumford.com/mset/modelwatch1.html > > Here's an example using a magnetic sensor: > http://leapsecond.com/pages/Junghans/ > > /tvb > > _______________________________________________ > 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.