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The Reach and Impact of the Remote Frequency and Time Calibration Services at NIST

Abstract The National Institute of Standards and Technology (NIST) has provided remote frequency and time calibration services to customers for more than three decades. These services continuously compare a customer’s primary frequency and/or time standard to the coordinated universal time scale kept at NIST, known as UTC(NIST), which is the national standard for frequency and time in the United States. The remote calibration services differ from traditional calibration services in at least two important ways. The first difference is that the customer does not send the device under test to NIST. Instead, NIST sends equipment to the customer that automates the measurements and returns the results via a network connection. The second difference is that the calibration never stops. New measurement results are recorded 24 hours per day, 7 days a week. This allows customers to continuously establish traceability to the International System (SI) units via UTC(NIST) without disturbing or moving their standard. This paper discusses the reach and impact of the NIST remote frequency and time calibration services by describing how they work, their calibration and measurement capabilities, their quality system, and the requirements of the customers that they serve.