Maybe that’s even more than half of the fun. [CuriousMarc] got an HP 5061A Cesium clock, a somewhat famous instrument as the model that attempted to prove the theory of relativity. The reason?

We normally think of atomic clocks as the gold standard in timekeeping ... levels of the ground state of a stationary cesium-133 atom at a temperature of 0K. But there is a move to replace ...

“This advanced ESTU module enhances our industry-first high-performance optical cesium atomic clocks, delivering substantial benefits, including reduced Allan Deviation. These improvements are ...

Water clocks, which appeared around 2,000BC ... has a frequency roughly one million times higher than the cesium atom's. This means that, although it has been measured with a lower accuracy ...

A feedback loop is also used to stabilize the 578-nm laser frequency to the clock transition. Absolute frequency measurements are carried out relative to a local caesium-fountain primary frequency ...

Industries such as metrology, aerospace and defense need ultra-stable timing for accurate data collection and reliable communication Adtran’s Oscilloquartz optical cesium clock now features the ...