A method and apparatus for collecting digital sample data from a target system accesses the digital sample data at transitions of a sample clock, acquires information related to an instantaneous average period of the sample clock, and records {TAIL ~ the digital sample data} and the information related to the instantaneous average period of {HEAD ~ the sample clock} 
A method and apparatus for collecting digital sample data from a target system accesses the digital sample data at transitions of a sample clock , acquires information related to an instantaneous average period of the sample clock , and records { TAIL ~ the digital sample data } and the information related to the instantaneous average period of { HEAD ~ the sample clock }
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