A NIST Disciplined Oscillator

Published

July 26, 2010

Author(s)

Michael A. Lombardi

Abstract

The National Institute of Standards and Technology (NIST) now offers a service that provides customers with an oscillator locked to UTC(NIST), the United States national standard for frequency and time. A NIST disciplined oscillator (NISTDO) works by utilizing both the Internet and common-view observations of Global Positioning System (GPS) satellites, and can serve as the primary frequency and time standard for a calibration or metrology laboratory. NISTDOs are directly referenced to the Coordinated Universal Time scale kept at NIST, known as UTC(NIST). This makes it easy for laboratories to establish traceability to the International System (SI) directly through NIST. Customers are provided with standard frequency outputs of 5 MHz and/or 10 MHz, as well as 1 pulse per second timing outputs. These outputs provide time accurate to within about ±20 ns (peak-to-peak variation) with respect to UTC(NIST) and provide frequency with an uncertainty near 5 × 10-14 when averaged over a 24-hour interval. This paper discusses the theory of operation of the NISTDO, and demonstrates the accuracy and stability of the device over both short and long time intervals.

Proceedings Title

21st Century Innovations in Metrology

Conference Dates

July 25-29, 2010

Conference Location

Providence, RI

Conference Title

Proc. 2010 NCSLI International Workshop and Symposium

Pub Type

Conferences

Download Paper

Local Download

Keywords

disciplined oscillator, GPS, Internet, time scale, time transfer

Citation

Lombardi, M. (2010), A NIST Disciplined Oscillator, 21st Century Innovations in Metrology, Providence, RI, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905719 (Accessed November 27, 2024)