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Data logging means measuring something over a period of time with a sensor and recording the results.

A data logging system consists of sensors connected via an interface to a computer and some data logging software.


When designing a data logging system, you can decide:
  • over how long the measurements will take place (the period of logging);
  • the amount of time that should pass between each measurement (the time interval).
Some data logging systems also need to be calibrated before they are used. This involves the computer matching the sensor readings with standard units that humans can understand.

Benefits of Data Logging

Advantages of using computers to record data rather than recording it manually include:
  • Mistakes are not made in reading the results. The computer will not make errors unlike a human. For example it is quite easy to misread the temperature using the scale on a thermometer.
  • Measurements are always taken at the right time. The computer will not forget to take a reading or take a reading too late or too early, unlike a human.
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