Pendulum 6688 Series Stand-alone Frequency Standard

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  • Up to 11 other instruments can be supplied
  • Both 10 and 5 MHz always included
  • Portable ultra-stable Rubidium standard takes the stability to any desired location

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Pendulum 6688 Series Stand-alone Frequency Standard

Ideal Reference for Multiple Testers ​

These Pendulum frequency standards suit the highest demands for stability. All frequency standards offer multiple buffered outputs (5x or 10x outputs of 10 MHz sine). Choose from the low-cost 6688 based on a very-high-stability oven-controlled SC-cut crystal oscillator or the 6689 with a built-in Rubidium atomic clock.


These standards are suited for use in automatic test systems, for example in the production department of telecommunications companies, especially when multiple instruments/testers need to be supplied with a stable frequency reference. 

The very short warm-up time of only 10 minutes makes these units suitable also for field use.