Data Logging

Data Logging

Data logging is a type of data acquisition system and the terms are at times used interchangeably; however, while a data logger is always a type of data acquisition system, a data acquisition system is not always a data logger due to several key differences. Some of these differences include data loggers characteristically featuring slower sample rates and being stand-alone devices rather than requiring a connection with a PC as do most types of data acquisition systems. There are many different types of data loggers, so in order to optimize the data logging process it is important to know the specific application desired and the conditions that application requires. Some examples of the many different applications that data loggers are utilized for in various industries include: meteorology, for data acquisition of the weather such as wind speed, relative humidity and several other factors; and agriculture, useful for determining optimum planting conditions such as the soil moisture level; automotive, for testing, troubleshooting and maintenance of vehicles.

Since data loggers are defined in so broad of terms, they include a wide range of data storage devices. Able to store the data internally until the time comes to transfer it to a personal computer (PC), data loggers offer independence of operation. Not only able to store data, many data loggers offer additional function such as the ability to activate safety alarms, regulate temperature in sensitive environmental conditions and to control test conditions. For the most basic function of data storage, the data logging process begins with the instrument of device that transmits the signal or signals requiring translation or conversion. In order for the conversion of the signal to occur, a transducer is used in order to change the typically analog signal into an electric, or digital, signal that a computer is able to understand and utilize. There are many different design aspects of data loggers that make them better suited for certain applications. One example is that of the input signal. A data logger's input signal affects whether or not the data logging device will be compatible with the signals that the instrument or device is sending. Another example is the number of inputs that the data logger features, which can affect the application based on whether the device requires a single or multiple-channel data logger.