I noticed you can change the baud rate to for instance, 115200, but I can’t get it to stay persistent after power off. You send it a command of $B11520* to change it to 115,200, but since it only sends like once every 300msecs, it doesn’t really matter the baud.
I found the unit isn’t competitive with the TICC2 and TADD combo. When measuring a 1PPS signal, the returned values are (around 1.000 000 000) 1.000 000 005 and 0.999 999 995. Note the ‘5’ as the last digit. When measuring signals greater than a certain frequency that escapes me, the last digit will then add more resolution switching from units of 5 to 1. Also, in the doc they talk about digits returned from 8 - 12. I’ve never seen anything come back from it other than 10:9 or 10.9 format depending on your coding skills. I tried putting it into ‘High precision” mode by sending it a $E3434* command. You can change the gate on the fly using the $G* command. It cycles through the gate times opposed to being able to set it directly. There are a number of persistent commands that enable default startups, etc. And one other issue, though it has a somewhat high input level, I noticed I had to put an attenuator on it for measuring the 1PPS out of an HP 5061B Cs. Otherwise it returned a time of 3hz instead of 1hz for some reason. All done in 50 ohm mode. Otherwise a nice unit for the money. I’m thinking someone should start a group to move this off list. Regards, Jerry > On Oct 3, 2019, at 8:59 PM, Mark Sims <hol...@hotmail.com> wrote: > > I did a test of the FA2 internal OCXO warm up time. I powered mine down for > 4 fours and then powered it up and measured the frequency as it warmed up. > It looks like it takes 45 minutes to stabilize. > > Note that it took a week of constant power for the oscillator drift rate to > settle down. The drift on mine seems to be around 0.00025 Hz/day. I need to > do a longer test to better weed out temperature sensitivity. > > BG7TBL internal oscillator warm up time: > > Minutes Freq error > 0 221 Hz > 1 17 HZ > 2 0.2760 Hz > 3 0.0500 Hz > 4 0.0350 Hz > 5 0.0240 Hz > 10 0.0130 Hz > 15 0.0080 Hz > 20 0.0060 Hz > 25 0.0050 Hz > 30 0.0042 Hz > 35 0.0040 Hz > 40 0.0034 Hz > 45 0.0021 Hz <--- stable > 50 0.0025 Hz > 55 0.0022 Hz > 60 0.0020 Hz > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
