Stanford Research FS725 Rubidium Frequency Standard


The FS725 integrates a rubidium oscillator (SRS model PRS10), a low noise universal 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.


  • 10 MHz and 5 MHz outputs
  • 20 year aging less than 0.005 ppm
  • Ultra low phase noise
    (<-130 dBc/Hz at 10 Hz)
  • 1 pps input and output
  • RS-232 computer interface


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