[time-nuts] Do any regulations or laws require time to beaccurate within 'x' seconds?

[Bill Hawkins]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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
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