FS725 Benchtop Rubidium Frequency Standard0 pages

Frequency Standards
FS725 — Benchtop rubidium frequency standard

FS725 Rubidium Frequency Standard
· 10 MHz and 5 MHz outputs
· 1 pps input and output for
GPS synchronization
· 20 year aging less than 0.005 ppm
· Ultra-low phase noise
(<−130 dBc/Hz at 10 Hz)
· Built-in distribution amplifiers
(up to 22 outputs)
· RS-232 computer interface
· Two status alarm relays

The FS725 integrates a rubidium oscillator (SRS model
PRS10), a low-noise AC power supply, and distribution
amplifiers in a compact, half-width 2U chassis. It provides
stable and reliable performance with an estimated 20 year
aging of less than 5 × 10–9, and a demonstrated rubidium
oscillator MTBF of over 200,000 hours. The FS725 is an
ideal instrument for calibration and R&D laboratories, or any
application requiring a precision frequency standard.
There are two 10 MHz and one 5 MHz outputs with
exceptionally low phase noise (–130 dBc/Hz at 10 Hz offset)
and one second Allan variance (<2 × 10–11). The FS725 can
be phase-locked to an external 1 pps reference (like GPS)
providing Stratum 1 performance. A 1 pps output is also
provided that has less than 1 ns of jitter, and may be set with
1 ns resolution.
Up to three internal distribution modules can be added to the
FS725. Each module has four 10 MHz outputs, one 5 MHz
output, and one 1 pps output, all with the same low phase
noise, harmonic distortion and jitter.
An RS-232 interface allows direct communication with the
rubidium oscillator. Using the provided Windows software,
you can easily monitor and control 1 pps timing, and
determine the instrument’s operational status.

· FS725 ... $2695 (U.S. list)

There are two alarm relays that indicate the status of the
rubidium oscillator lock state and synchronization to an
external 1 pps input. The relays are SPDT, providing both
normally-open and normally-closed contacts.

tttttttt
Stanford Research Systemstttt
t
t

phone: (408)744-9040
www.thinkSRS.com