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Data logging versus data acquisition:
Data loggers typically have slower sample rates. A maximum sample rate of 1 Hz is a speed that may be considered to be very fast for a data logger, yet very slow for a typical data acquisition system.
Data loggers are implicitly stand-alone devices, whereas a typical data acquisition system must remain tethered to a computer to acquire data. This stand-alone aspect of data loggers implies on-board memory that is used to store acquired data. Sometimes this memory is very large so it can accommodate many days, or even months, of unattended recording. This memory may be either a battery-backed static random access memory, flash memory, or EEPROM.