[time-nuts] line frequency website

Steve . iteration69 at gmail.com
Fri Dec 30 21:15:04 EST 2011

I recently changed to an APC UPS (which was an upgrade in communications,
but a downgrade in efficiency) that  which supports reading the voltage.
It's one of those AVR type that can boost or drop the voltage so it's
closer to spec. It seems to drop out below 95v, and above 135v (factory
eeprom settings). Yet another thing i want to log. So busy playing with
everything makes it hard to find time.

On Fri, Dec 30, 2011 at 8:07 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

> > Well, I design systems that we send out all over the world. I have
> various
> > spec numbers that indicate some rather optimistic tolerance. For
> example, I
> > have measured actual outlets in the US at 70VAC and 142VAC, which is well
> > outside the published tolerances. I get a lot of flack from management
> when
> > I try to use those numbers as operational limits instead of the utility
> > published ones. Some empirical evidence from a third party would help a
> lot.
> 70 and 142 seem more than a bit unreasonable.  How long did they stay at
> that
> level?
> I like Jim's suggestion of asking the guys who are collecting the data.
> ----------
> I've been using my UPS to monitor line voltage.  It's got commands to read
> the min/max input voltage since the last time you asked.
> My software writes a line to the log file every 5 minutes or more often if
> the line voltage changes by more than 2 V.  It runs about 30K per day.
> Mostly, things are boring: 120-125 V.  Occasionally I see a glitch.
> I should write some code to scan the old files and collect statistics.
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
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