Hi Bob, It's rather curious. Using my handheld DVM in the diode scale, I get a reading of 448 in one direction and 458 in the other with it off and cold. In the 2K ohms scale, I get 561 and 562 ohms. Later on, I'll pop the top off again and take a pic so I can expand it and look at it. For what it's worth, my DDS board is 2 revisions earlier than the one Matthias Bopp modifies here "http://www.dd1us.de/Downloads/precise%20reference%20frequency%20rev%201_0.pdf";
Bob >________________________________ > From: Bob Camp <li...@rtty.us> >To: Discussion of precise time and frequency measurement <time-nuts@febo.com> >Sent: Saturday, September 21, 2013 3:00 PM >Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator > > >Hi > >As far as I know the lock output is a CMOS output that will drive a couple of >ma. There are so many variations that yours may indeed be an open collector >and good to +15 volts. > >Bob > >On Sep 21, 2013, at 10:55 AM, Bob Stewart <b...@evoria.net> wrote: > >> The instructions I got with this Rb said that you could hook an LED through >> a 5-10K resistor to the +15 supply and get a lock indication. I'm using a >> 10K resistor and the LED lights as soon as it's powered up from cold. Is >> the loop lock indicator circuit broken or is it just another strange option >> for these things? I saw on one site that if you do it this way it prevents >> lock, but mine seems to lock OK with or without the voltage. >> >> >> Bob - AE6RV >> _______________________________________________ >> 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.
