Hi Those readings sound a lot more like a CMOS gate output than some sort of open drain / open collector discrete driver.
Bob On Sep 21, 2013, at 4:43 PM, Bob Stewart <[email protected]> wrote: > 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 <[email protected]> >> To: Discussion of precise time and frequency measurement >> <[email protected]> >> 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 <[email protected]> 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 -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
