Think of the pulse like a cardiograph:
a computer readout graphically recording the physical or functional aspect of the heart. Like the graph being sketched across the screen of the computer the pulse has its own rate, crest, wave, amplitude, and cessation.
These individual characteristics define the overall movement, quality, and rhythm of the pulse.
In these broader categories the Doshas of Vata , Pitta , and Kapha can be distinguished based on the smaller movements sketched graphically by a cardiograph.
In pulse diagnosis our fingers become the receptors that transfer the information of the heart beat graphically into a more concrete image.