Prebody:
Prepares for the testing. Typical Prebody setup activities are: obtaining levels and timing information for any patterns to be run; computing the number of samples to be made; setting initial states on pins.
Body:
Performs the testing. Typical body activities are: running any patterns for preconditioning or dynamic conditioning; connecting and disconnecting specified pins; performing the functional test or parametric measurement; running any user-written interpose functions at the appropriate points.
备注：burst pattern动作在prePatF之后，PretestF之前执行
Postbody:
Performs any post-test clean-up functions. Typical Postbody activities are: restoring pin electronics to their entry state; returning channels to their default start-state conditions.
