Here is a blurb I stole from the Qiagen website. It should answer your question.
"First, all the components are denatured at 95°C, followed by complete annealing at a set temperature (based on the primer Tm values), followed by a gradual increase in temperature up to 95°C. Fluorescence intensity is monitored during this final temperature increase, resulting in the generation of a melting curve or dissociation curve."
During the ramp up to 95°C, I have generally increased by 2°C/s.