Atomic Clocks for Ensemble Time Scales

The National Institute of Standards and Technology (NIST) is seeking information on vendors that can provide atomic clocks for ensemble time scales. The clocks should have short-term stability of <= 1e-11 Allan Deviation (ADEV) at 1 s averaging interval and long-term stability of <= 2.7e-14 ADEV for averaging intervals longer than 100,000 s. The clocks should also have at least one output signal at 10 MHz nominal frequency, amplitude >= 1 Vrms, and accept an input pulse-per-second (PPS) signal for coarse synchronization. The clocks should be compatible with EIA-compliant equipment racks and have an operational temperature range of 15°C – 45°C. • The clocks should have a demonstrated mean time between failures (MTBF) > 10 years. • The clocks should have a power consumption of < 100 W. • The clocks should have a digital system control and monitor interface, as serial (RS232), ethernet, or similar standard interface. • The clocks should have a battery backup providing at least 30 minutes of operation. • The clocks should be delivered to NIST-Boulder campus and NIST-Gaithersburg campus.