NIST Issues Updated Time and Frequency Services Handbook

The Time and Frequency Division at the National Institute of Standards and Technology (NIST) operates one of the world's most accurate time systems, along with maintaining the primary standard of frequency and time interval for the United States. However, such an amazingly accurate clock would benefit few users if there was no way to make its time and frequency signals available to everyone.

To help spread the word about NIST's "timely" help in this area, the agency recently published an updated version of NIST Time and Frequency Services (NIST Special Publication 432). This comprehensive and technically detailed guide describes the variety of time and frequency services provided by NIST, including:

• high- and low-frequency radio broadcasts,
• telephone announcements and timing signals,
• Internet-based time-setting, and
• Global Positioning System (GPS)-based calibration.

Most of these services are free. They are used to synchronize and calibrate clocks, electronic devices and electrical equipment across the nation and around the world.

SP 432 may be obtained from the Time and Frequency Division Web site at http://tf.nist.gov.

A single printed copy may be obtained from SP 432 Request, MC 847.00, NIST, Boulder, Colo. 80305-3337; (303) 497-3276; timeinfo@boulder.nist.gov.

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