Since 1967, the hyperfine transition frequency of the ground state of the cesium 133 atom has defined the unit second. Our cesium time and frequency references are the most accurate commercial atomic clocks available. Our state-of-the-art facilities manufacture cesium references with accuracies as low as 5E−13, with no systemic frequency drift during the operational life of the unit and no need for calibration. Cesium frequency references are widely deployed as the primary source of time and frequency in a broad range of applications, including timing and metrology, defense, Position Navigation and Time (PNT) systems, telecommunications, data centers and critical infrastructure.
Featured Products
5071B Cesium Frequency Standard
- Successor to 5071A
- ≤ 5E-13 frequency accuracy, including all defined environmental conditions
- ≤ 1E-14 Allan deviation floor
- No deterministic long-term drift
- Battery backup for short-term power interruptions
5071A Cesium Frequency Standard
- ≤ 5E-13 frequency accuracy, including all defined environmental conditions
- ≤ 1E-14 Allan deviation floor
- No deterministic long-term drift
- Battery backup for short-term power interruptions
CSIII 4310B Cesium Frequency Standard
- Smallest cesium frequency reference available on market in a 2U form factor
- ≤ 1E-12 frequency accuracy for all defined environmental conditions
- No deterministic long-term drift
- ≤ 5E-14 Allan deviation floor
Time Cesium PRS-4400 and PRS-4500
- Autonomous stratum 1 reference for telecom applications
- Front access ETSI shelf: PRS-4400
- Rear access ANSI shelf: PRS-4500
- Outputs: E1, T1, 2048 kHz per G.703, 10 MHz, 1.544 MHz and composites
Accessories and Services
- Cesium beam tube replacements
- Replacement backup batteries
- Rackmount equipment
- Certificates, test documents and more
Coordinated Universal Time (UTC)
UTC is the global standard for the time of day. It is used to synchronize power grids, cell phone networks and satellite communications across the world. The time is created by a weighted average of approximately 400 atomic clocks located around the global. In the June 2022 UTC report (Circular T), we had 226 cesium clocks contributing to UTC, representing 99% of all cesium clocks in the ensemble.
