The data logging are any device that can be used to store data. This include the data devices such as plug-in boards or serial communication systems which use a computer as a real time data recording system. The most instrument manufactures consider a data logger a stand alone device that can read various types of electrical signals and store the data in internal memory for later downloads to a computer. Data loggers are available in various shapes and sizes. It is easy to connect and set up sensors and the logging systems is more rugged and less power hungry and making it capable of running on batteries for longer periods of time.
Using computers to record data has a number of advantages over recording data manually :
- Measurements are always taken at the right time. Unlike a human the computer will not forget to take a reading or take a reading too late or too early.
- Mistakes are not made in reading the results. Humans can make errors. For example it is quite easy to misread the temperature using the scale on a thermometer.
- Data logging devices can be sent to places that humans can not easily get to. e.g. to the planet Mars, into the bottom of a volcano, or onto a roof of a tall building to get to a weather station.
- Graphs and tables of results can be produced automatically by the data logging software.
The main disadvantage of using a data logging system is
- the cost of the equipment is expensive.
- the cost for the repair of equipment also expensive.
- the equipment must use in the proper used.
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