UHF-RUB Rubidium Atomic Clock

The UHF-RUB upgrade option provides an atomic frequency standard to the UHFLI instrument. Experiments in need of a high frequency accuracy and stable operation over long periods of time even in adverse conditions, e.g. laboratories with limited climate-control, can rely on the Rubidium based atomic clock. Moreover, calibration demands are also further reduced as there is essentially no clock aging. The UHF-RUB is a hardware option that cannot be upgraded later in the field.

UHF-RUB Key Benefits

  • High frequency accuracy by atomic reference
  • Extreme temperature stability
  • Excellent aging performance
  • Minimal phase noise
  • Long-term result reproducibility

UHF-RUB Upgrade and Compatibility

  • Option cannot be upgraded in the field
  • Compatible to all other UHF options

All UHF Instruments feature a high-quality temperature controlled crystal oscillator (OCXO). For even tougher applications, the UHF-RUB option provides a rubidium-based atomic clock with extreme temperature stability, minimal phase noise characteristics and great performance throughout the aging process. The most relevant specification parameters are better by orders of magnitude.

The clock generated by the rubidium option can be output on the clock connector of the UHF Instrument.

Product Selector

Specifications UHF-RUB Option OCXO (included)
Clock frequency (nominal) 10 MHz 10 MHz
Clock initial accuracy at 25° ±0.0005 ppm ±0.5 ppm
Clock short term stability, AVAR (over 1 s) <0.00008 ppm <0.00005 ppm
Clock short term stability, AVAR (over 100 s) <0.000008 ppm <0.0005 ppm
Clock long term stability (aging) ±0.0005 ppm/year ±0.4 ppm/year
Clock temperature coefficient at 23°±5° ±0.0005 ppm/° ±0.03 ppm/°
Clock phase noise @ 100 Hz −130 dBc/Hz −130 dBc/Hz
Clock phase noise @ 1 kHz −140 dBc/Hz −140 dBc/Hz
Time to reach specification @ 25° 300 s 60 s

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