Atomic Desk Clock

Display Interface of Atomic Clock

I used an E-5680A Rubidium Frequency Standard to create an atomic desktop clock. It would supposedly be accurate to one second very 15 years with no external inputs. In the real world I do not expect to approach this level of stability. I connected the pulse per second output from the frequency standard to an interrupt pin on an ATmega micro controller. The micro controller increments a second counter on each pulse and displays the time on a display.

Internal Guts of the Frequency Standard

The frequency standard operated for only a short time providing pulse per second output. Now it is producing no time signal (PPS or sine wave) output.