Rubidium Frequency Standard0 pages

Frequency Standards
PRS10 — Rubidium frequency standard with low phase noise

PRS10 Rubidium Frequency Standard
· Low phase noise
(< −130 dBc/Hz at 10 Hz)
· Time-tags or phase-locks
to a 1 pps input
· 72 hour Stratum 1 level holdover
· RS-232 for diagnostics, control and
calibration
· 20 year lamp life

The PRS10 is an ultra-low phase noise, 10 MHz rubidiumdisciplined crystal oscillator. The device fulfills a variety
of communication, synchronization and instrumentation
requirements. The phase noise of the 10 MHz output is low
enough to be used as the reference source for synthesizers. The
unit’s short-term stability and low environmental coefficients
make it an ideal component for network synchronization. Its
low aging rate makes it an excellent timebase for precision
frequency measurements.
The PRS10 can time-tag an external 1 pps input with 1 ns
resolution. These values may be reported back via RS-232, or
used to phase-lock the unit to an external reference (such as
GPS) with time constants of several hours. This feature can
provide Stratum 1 performance at a very low cost.
The PRS10 establishes a new level of features and performance
in atomic frequency standards. Its design provides the lowest
phase noise, greatest versatility, and easiest path to system
integration of any rubidium frequency standard available.
PRS10 Operation and Design

· PRS10 ... $1495 (U.S. list)

All commercial rubidium frequency standards operate by
disciplining a crystal oscillator to the hyperfine transition at
6.834,682,612 GHz in rubidium. The amount of light from
a rubidium discharge lamp that reaches a photodetector
through a resonance cell will drop by about 0.1 % when the
rubidium vapor in the resonance cell is exposed to microwave

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