Disregard that. Meant for someone else. I apologize. Sent from mobile
> On Feb 16, 2014, at 7:33 PM, Bill Dailey <[email protected]> wrote: > > No idea. That's what's sad. They all blend together. > > Sent from mobile > >> On Feb 16, 2014, at 6:17 PM, "Jimmy D. Burrell" <[email protected]> wrote: >> >> Bingo! It's working now!! Thanks to everyone on the thread. >> >> Paul, I have to give chops to Bob on this one, even though my experience is >> the same as yours with respect to the preset triggers. Actually, your >> comments/question about the "trigger lights flashing" in concert with the >> 1PPS signal got me looking/thinking and no, they weren't. BTW, my 0.000001 >> number was meant to be Hz but I left off the units. >> >> Both Bobs (Camp and Albert) were pointing me at the 'input'. So, I drug out >> the HP5335A manual and re-read about all 4 trigger levels. Auto-adjustable >> mode allows adjusting the trigger according to the amplitude of the input >> signal... a sort of percentage trigger mode, i.e. turn the trigger control >> clockwise to 3/4 scale and you're triggering at 75% of the signal's >> amplitude. >> >> The above trigger changes combined with reconfiguring for 50ohms input >> signal did the trick. I'm now seeing readings like 0.999 999 983 +0. >> >> Thanks again, >> >> Jim... >> N5SPE >> >> >>> On Feb 16, 2014, at 4:07 PM, Bob Camp <[email protected]> wrote: >>> >>> Hi >>> >>> If you have a 50/50 duty cycle 1 pps, it’s going to work with a lot of >>> settings. With a narrow (say 10us wide) pulse, most of the counters have >>> auto trigger issues. If it’s already known to be reading nutty, trigger is >>> a good place to start looking. >>> >>> Bob >>> >>>>> On Feb 16, 2014, at 4:29 PM, Paul <[email protected]> wrote: >>>>> >>>>> On Sun, Feb 16, 2014 at 2:33 PM, Bob Camp <[email protected]> wrote: >>>>> >>>>> On all these counters, you need to switch to DC input for 1 pps signals. >>>>> You also need to manualy set the trigger level to something like +1.5V. >>>> >>>> >>>> I can't believe I'm disagreeing with Bob Camp but this is not my >>>> experience. 99.9% of the time preset trigger works fine and I think you >>>> should start with that. AC coupling almost always works and is sometimes >>>> required (with the Rb I think). >>>> >>>> I have a 5335A (w/ opt 010+040) and have measured 1PPS on my PRS-10, Fury, >>>> Firefly and random GPS parts. If the trigger light is not flashing at 1 Hz >>>> the only thing I've ever had to do is toggle AC coupling or enable 1PPS >>>> output on the device (or plug it in). Sometimes increasing the gate time >>>> tidies up the display. >>>> _______________________________________________ >>>> 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.
