ABSTRACT This paper describes the current performance of the Physikalisch-Technische Bundesanstalt's (PTB) primary clock CS1. After major reconstruction during 1995 and 1996, routine clock operation was started in May 1997. An evaluation of the CS1 Type B uncertainty yielded 7·10-15 (1σ). The performance of the CS1 is illustrated by results of a comparison lasting 2 yr with other clocks at PTB and with the International Atomic Time (TAI) and free atomic time scales. With reference to TAI, e.g., a frequency instability of 3.9·10-15 at an averaging time of 30 d was observed.
© 2000, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.