That's an interesting reference. Google finds it. Assuming that the digital frequency transducer measures the 60 Hz line frequency, the required accuracy is somewhat less than 2 parts in 10E-5.
Analog transducers, like Watts, Volts, and VARs, require 0.25% of scale accuracy. Calibration is annual. This is nothing like the 10E-15 sought by time nuts. Bill Hawkins -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Clapp Sent: Friday, November 21, 2008 1:04 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Do any regulations or laws require time to beaccurate within 'x' seconds? The North American Electric Reliability Corporation (NERC) under federal law can fine of up to $1 million a day. Standard BAL-005-0 - Automatic Generation Control Requirement 17. Each Balancing Authority shall at least annually check and calibrate its time error and frequency devices against a common reference. The Balancing Authority shall adhere to the minimum values for measuring devices as listed below: Device Accuracy Digital frequency transducer ? 0.001 Hz _______________________________________________ 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.
