| 摘要 |
The application discloses a data logger (1) for logging values of a physical environment parameter (T) as a function of time (t). The application also discloses a method for use in the data logger (1) for sampling and encoding successive sample values. The data logger (1) comprises a sampling subsystem (2), which acquires sample values (21) of the physical environment parameter (T) at sampling moments which are separated by sample intervals (INT1, INT2). An encoding subsystem (3) defines data records representing groups of one sample value (21) or a number of successive sample values (21) with variations which meet a first stability criterion. Each data record comprises first identifiable bits (b10-b00) defining a representative value (Trep) for the samples values (21) of the corresponding group and a second identifiable bits (b15-b12) indicating the number of samples in the corresponding group and a flag bit (b11) indicating the use of either the first or second interval length. A memory subsystem (4) for storing the sequence of defined data records into a memory (7). The application further discloses a reading device (40) which reads the data records from the data logger (1). The logged data can be made visible as a graph or table on a display of the reading device (40). Preferably the reading device is a NFC enabled Smartphone in which an App can be loaded for providing the read and display function. This App can be made available for downloading on a server (41) which can be connected to the Smartphone via a communication network, such as e.g. the internet. |
