title: Recent results of Physikalisch-Technische Bundesanstalt's primary clock CS1.
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) (1sigma). 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.
authors.affiliation: Phys. Tech. Bundesanstalt, Braunschweig.
authors.forename: A
authors.initials: A
authors.lastname: Bauch
authors.forename: B
authors.initials: B
authors.lastname: Fischer
authors.forename: T
authors.initials: T
authors.lastname: Heindoff
authors.forename: R
authors.initials: R
authors.lastname: Schroder