I figured it out. I was counting the bottom row from the wrong end. To actually find the PPS signal I had to set my scope to one-shot triggering at a very fast timebase setting (I used 500 ns/div). It’s only 1 µs wide, but it was there.
> On Sep 11, 2015, at 6:07 AM, Nick Sayer <nsa...@kfu.com> wrote: > > That makes sense. Thanks! That’ll help when it comes time to attempt to > calibrate it. In this case, I doubt the seller speaks enough English to ask. > But I can look at all of the pinout variations to find one with a TX pin on > that wire. > >> On Sep 11, 2015, at 3:59 AM, Bob Camp <kb...@n1k.org> wrote: >> >> Hi >> >> There are far more unique pinouts for the 5680 than anybody can keep track >> of. Three also is very little that ties the markings on the unit to a >> specific pinout. If you are getting -5V, my guess is that you have an RS-232 >> output on that pin. >> >> Normal drill is to go back to the seller and see what they do or don’t know >> about it. >> >> Bob >> >> >>> On Sep 10, 2015, at 9:06 PM, Nick Sayer via time-nuts <time-nuts@febo.com> >>> wrote: >>> >>> I’ve acquired an eBay 5680. I’ve hooked it up to +15 and +5 and am getting >>> 10 MHz out and the test pin is low. The unit is warm and within any >>> reasonable expectations, it appears to be working properly. >>> >>> What I wonder about is pin 6 on the connector. Google results seem to >>> indicate that that’s supposed to be a PPS output, but what I get on it is a >>> fixed -5v or so. Anybody know what this signal is supposed to be? >>> >>> _______________________________________________ >>> 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.