NIST-7, the new US primary frequency standard
Open Access
- 30 December 2002
- proceedings article
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
NIST-7, an optically pumped, cesium-beam frequency standard has replaced NBS-6 as the official US primary frequency standard. The present short-term stability of the standard, measured with respect to an active hydrogen maser, is characterized by uy(t) L 8 x i". Our first evaluation has resulted in an uncertainty of 4 x An improved servoelectronic system is being developed and this should improve stability and allow for more precise evaluation of the various systematic errors.Keywords
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