Hi A 5335 / 5334 generation counter will spot a 30 ns blip. A modern MCU demo board probably can to the same sort of thing. The cost of another (cheap) couple of counters is probably less than mucking around with power line monitors and giant banks of batteries.
The most likely output of a *really* good monitor: There is a blip of some sort about every 5 to 10 minutes forever and ever ….When there is bad weather they happen every few seconds up to a few a second. Not a lot you can make sense out of …. ==== UPS’s (except for the continuous type) are designed with an “acceptable dropout” in mind. The assumption is that the gear downstream is OK with a cycle / half cycle / couple of cycles missing. Compared to the sort of things a really good line monitor catches, those are giant blips. Does a 5370 chug on through a 30 ms full line drop out and go nuts on a 3.1 (or 30 or 0.3) us wide spike at 203V? Seems unlikely. If it does, the answer is a really good (screen room grade) line filter rather than a UPS of any sort. ==== Here’s something to try that has not yet come up: Grounding is more likely to be the issue than anything else. Having an isolated / independantly grounded test space is a really good idea. You can get surplus isolation transformers into the couple of KVA range for mighty cheap prices. Coupled with a good line filter they will take out a lot of mains related issues. They will also force you to cable up everything to the new “good ground”. It might also drive you to look at how the GPS and other antennas are grounded and isolated from the test system. Keep in mind this is *not* an un-grounded system. There still is a proper ground on it. It just isn’t grounded who knows where and who knows how. Bob > On Jul 8, 2016, at 12:25 AM, Bob Stewart <b...@evoria.net> wrote: > > > Nothing looks good at the moment. It may be that I just have to trust the > equipment testing and if there's a big blip that's not repeatable, then it > didn't happen. No, I don't like it either. > Bob > ----------------------------------------------------------------------------------- > GFS GPSDO list: > groups.yahoo.com/neo/groups/GFS-GPSDOs/info > > From: Hal Murray <hmur...@megapathdsl.net> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency > measurement <time-nuts@febo.com> > Cc: Hal Murray <hmur...@megapathdsl.net>; hmur...@megapathdsl.net > Sent: Thursday, July 7, 2016 11:18 PM > Subject: Re: [time-nuts] The home time-lab > > > b...@evoria.net said: >> So, since I need to power the 5370 (preferably both) I'm looking at a deep >> cycle battery, a charger, and an inverter? At this point in the process, a >> power line monitor is looking like a good solution. At least it would tell >> me to ignore the test results. > > Yes, you can build your own UPS. It would be interesting to see what the > parts cost totals out to. > > What did you have in mind for a power line monitor? > > I didn't look very hard, but I didn't see anything interesting under $100. > My manual says the 5370 is 250 VA. 2 of those cuts out some of the low end > UPS units, but there are still several left under $100. > > They will fix the blinking lights glitches. They won't fix real power > outages that last for more than a few minutes. > > > -- > These are my opinions. I hate spam. > > > > > > _______________________________________________ > 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.
