Data Logger, in Particular for Monitoring an Environment Parameter for Storing Medication

摘要

A data logger for logging values of a physical environment parameter as a function of time includes a sampling subsystem which acquires a sequence of sample values of the physical environment parameter at sampling moments which are separated by sample intervals, an encoding subsystem which converts the sequence of sample values in data records including a representative value representing groups of one sample value or a number of successive sample values with variations which meet a stability criterion and information representative of the lengths of the groups, a memory subsystem which stores a sequence of defined data, and the data logger is arranged to determine in which range of a plurality of ranges a sample of the environment parameter is located, and to use a stability criterion for the encoding which depends on the determined range.