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Microsemi 4310B

Cesium Frequency Standard

The Microsemi CsIII is a cesium frequency standard designed for high‑accuracy time and frequency reference applications. It provides 5 MHz and 10 MHz frequency outputs with an accuracy of ±1.0 × 10⁻¹² and Allan deviation below 1.2 × 10⁻¹¹ at 1 second. The unit supports 1PPS input and output for synchronization and is housed in a 2U rack‑mount chassis weighing less than 30 lb. Remote monitoring and control are available through an RS‑232 interface.

Product Info Related Products

Frequency Accuracy	±1.0 × 10⁻¹²
Frequency Stability (Allan Deviation)	<1.2 × 10⁻¹¹ @ 1 s; <8.5 × 10⁻¹² @ 10 s; <2.7 × 10⁻¹² @ 100 s; <8.5 × 10⁻¹³ @ 1,000 s; <2.7 × 10⁻¹³ @ 10,000 s; <8.5 × 10⁻¹⁴ @ 100,000 s; floor <5.0 × 10⁻¹⁴
Frequency Outputs	5 MHz and 10 MHz sine 1 V RMS 50 Ω; 10 MHz TTL >2.2 V 50 Ω
Harmonic Distortion	<−40 dBc harmonic; <−80 dBc non‑harmonic
Phase Noise (5 MHz SSB)	<−95 dBc/Hz @ 1 Hz; <−130 dBc/Hz @ 10 Hz; <−145 dBc/Hz @ 100 Hz; <−155 dBc/Hz @ 1 kHz; <−155 dBc/Hz @ 10 kHz; <−160 dBc/Hz @ 100 kHz
1PPS Timing Output	>3.0 V TTL 20 µs pulse width <5 ns rise time <1 ns rms jitter
1PPS Timing Input	>3.0 V TTL 20 µs pulse width <5 ns rise time <1 ns rms jitter
Warm‑Up Time	30 minutes typical
Frequency Adjust Range and Resolution	±1.0 × 10⁻⁹ range; 1.0 × 10⁻¹⁵ resolution
AC Power Requirements	100–240 VAC ±10% 47–63 Hz 65 W operating 90 W warm‑up
DC Power Requirements	22–36 VDC or 36–75 VDC 30 W operating 65 W warm‑up
Operating Environment	0 °C - 50 °C 95% RH up to 50 °C altitude 0 - 50,000 ft magnetic field 0–2 gauss
Physical Dimensions	3.50 in H × 19.00 in W × 15.0 in D (89.9 × 483 × 381 mm)
Weight	<30 lb (13.5 kg)
MTBF	>130,000 hours