Data acquisition

Data acquisition refers to all methods of simultaneous or sequential time measurement and counting, possibly einschließlichem timestamp for measurable or quantifiable data and groups of contiguous data.

Characteristic is the immediate and direct accessibility of the measured variable or a physically so clearly related spare size. This is the purpose of the measurement technology in all known forms.

To record includes also reading (English: reading ) ident features by means of appropriate markings and readers.

In deviating or more general meaning is ' data collection ' an operation, associated with the resulting data in a machine-readable form and stored on data carriers. Often, it refers to the acquisition activity of a user on the computer. See also input ( computer).

Demarcation from the mere collection of data

In contrast to the detection of the data collection (English: inquiry ) is a mathematically qualified replacement method, which calculates only linked to a non -access measurement in a sufficient size for the intended purpose, uniqueness and a recognized auxiliary variable and without direct time constraint. This is the purpose of the representative sample or the retrospective analysis of data and the methods of descriptive statistics in all known forms.

A data collection is thus never at the same time (online). In general ( non-technical ) usage data collection is often equated with data collection.

Measurement

In metrology is meant by data collection (English data acquisition, DAQ short ) recording of analog signals by means of appropriate hardware (eg, a data acquisition board ). In this case be produced with the aid of an analog- to-digital converter digital data which can then be processed by software. A distinction is made between off-line and on-line data acquisition.

Control

For the control, the concept of data collection in DIN 19222 has been defined.

" Collect data by measuring or counting and possibly by signal conditioning analog or digital data win "

Note: DIN 19222 has been replaced by DIN EN 60050-351.

Logistics

In logistics and trade is understood by means of automatic systems under data acquisition, the reading of barcodes or transponders. Two cases must be distinguished. Often, only a string is read, which serves as an identifier for an object, such as an article in a checkout scanner. With the advent of EAN128, two-dimensional bar codes and data freely writable transponder increasingly information is transported. This can also be production and safety information, for example, sell-by dates, sender and recipient addresses. Comparable to the font used for information storage and transfer between people is critical that the information on the disk (barcode / RFID ) for later reading machine saved.

Itemization

• Data acquisition
• Metrology
• User interface