line frequency website
From: time-nuts-bounces@febo.com [time-nuts-bounces@febo.com] On Behalf Of shalimr9@gmail.com [shalimr9@gmail.com]
Sent: Friday, December 30, 2011 3:47 PM
To: Time-Nuts
Subject: Re: [time-nuts] line frequency website
The problem is that while the frequency is going to be pretty much the same anywhere on the same grid, the voltage is not. Knowing the voltage at some point in your state (or another) is not all that useful. They may record it, but I am not even sure it would be worth saving in a database.
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.
We want to design systems that "Just work".
I've been loging my TED5000 (voltage, current) for almost half a year
now. It does not provide frequency, but the log is down to the second.
I keep several periods in the archive for easy access (Daily, Hourly
Minute, Second) About 3.5gb of csv energy data per channel for my home.
Problem is that when the power drops too low, the system stops working.
Looking at a few random files, it looks like the range for both legs is
about 10 volts. Ive checked frequency a few times in the past with the
fluke scopemeter, both at home and work (i live 7 miles away from work)
and have noticed it to jump between 58 and 62 hertz. Which makes sense
because our older alarm clock needs to be corrected every month of so.
I've been meaning to start logging frequency-- not got around to it yet.
Steve
Then the best is probably to do your own survey. I am not sure that what is being observed in an "undisclosed location" would have much weight with your management.
You can rent a Dranetz for a couple of months and install it a week at a time in carefully selected locations and get data that you can use.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: David VanHorn D.VanHorn@elec-solutions.com
Sender: time-nuts-bounces@febo.com
Date: Fri, 30 Dec 2011 16:07:33
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] line frequency website
From: time-nuts-bounces@febo.com [time-nuts-bounces@febo.com] On Behalf Of shalimr9@gmail.com [shalimr9@gmail.com]
Sent: Friday, December 30, 2011 3:47 PM
To: Time-Nuts
Subject: Re: [time-nuts] line frequency website
The problem is that while the frequency is going to be pretty much the same anywhere on the same grid, the voltage is not. Knowing the voltage at some point in your state (or another) is not all that useful. They may record it, but I am not even sure it would be worth saving in a database.
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.
We want to design systems that "Just work".
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.