Data Logging & Control

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Data Logging

  • the collection of data over a period of time
  • something often used in scientific experiments
  • systems typically monitor a process using sensors linked to a computer
  • can be done automatically under computer control
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Data Logging Process

  • Send signals to an interface box which is linked to a computer (interface box converts analogue signals to digital signals that the computer can understand)
  • Analogue signals: continuous signal for which the time varying feature       (variable), Digital signals: continuous signal thatcontainstime-varying quantities
  • Computer will take readings at regular intervals: time interval for data logging is the time between readings, logging period is the total length of time over which readings are taken.
  • Readings are stored in tables and can be displayed in graphs or passed to an application (spreadsheet)
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Advantages of Data Logging

  • can be used in remote or dangerous situations
  • can be carried out 24 hours a day
  • time intervals for collecting data could be very frequent and regular
  • no need to have a person present
  • often more accurate because there is no likelihood or human error
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Disadvantages of Data Logging

  • some data could be lost or not recorded if the equipment breaks down
  • expensive equiment for small tasks
  • data will not be collected if the equipment does not take readings at the logging interval which has been set up
  • sensors must be carefully calibrated (otherwise they would take wrong readings)

* Calibrated: To check, adjust, or determine by comparison with a standard

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