EEVblog No Script, No Fear, All Opinion 
Did you know you can use your frequency counter to detect gravity? You’ve likely done it before and you didn’t even know it!
Dave demonstrates the phenomenon of 2g-tipover on quartz crystal oscillators in an Agilent 53131A frequency counter.
Related videos:
How a rubidium frequency standard works
FE-5680A Rubidium Standard Teardown
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