Modern cyber-physical systems pose great challenges for system engineers to keep track of the system’s behavior when it comes to functions distributed all over the system. To check whether response time constraints are met, measurement data from different development stages is analyzed to track down the worst-case behavior observed.Several complex, signal dependencies have to be examined over long time periods. Therefore, computer aided approaches to support this task are strongly demanded. In this paper, we present EC.LANG, a formal language designed to specify evaluations over measurement data. It is particularly fitted to model event chains representing the data flow of system functions. To validate event chains against timing requirements, we implemented a compiler and an evaluation engine based on EC.LANG.