Abstract
In spite of its low cost, a modern global positioning system (GPS) module can be used to generate an extremely accurate time scale, starting from the one peak per second (1 PPS) signal delivered to the user. We guided our students, following the first experimental physics course, to compare the GPS pulse with the 1 PPS signal obtained by division from a quartz oscillator built by themselves. They were able to show that, over short time scales, the stability of the GPS signal is significantly poorer than over long time scales. As a conclusion, they recognized the need to combine different oscillators in order to obtain the best performing clock over all time scales. In making the measurements, students had to refine their analytical skills in order to understand the limitations of modern automatic data acquisition systems.
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