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Analog inputs - channel number
Analog inputs - bandwidth
Analog inputs - sample rate
Analog inputs - resolution
Analog inputs - isolation
Analog inputs - range
Analog inputs - type
Analog outputs - channel number
Analog outputs - frequency
Analog outputs - sample rate
Analog outputs - resolution
Analog outputs - isolation
Analog outputs - voltage range
Digital inputs - channel number
Digital inputs - type
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Digital outputs - type
Digital I/O - channel number
Relays, rel. drivers, switches, SSR
Internal sensors
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Data loggers (logger, recorder, line recorder...

... are devices for continuous data acquisition and recording/storage of measured data, comparable to a tachograph. A data logger records and stores measured values (e.g. from a built-in or externally connected sensor) at intervals over a certain period of time. These measured values can then be displayed, for example in a diagram over time (similar to a pen recorder). One of the simplest applications is the long-term measurement and recording of room temperature and humidity or other physical quantities. Accordingly, data loggers are used in environmental technology, in building/room monitoring, in transportation, in warehousing, in insurance, in quality assurance, in monitoring power quality as well as in many areas of the (industrial) internet of things/(I)IOT and much more. Ideally, the data logger includes all components for measuring, recording/storing data, some even have an integrated sensor with the corresponding signal conditioning. It then works more or less "stand-alone", possibly with battery even independent of the mains. The measurement data can then be transferred to a PC or mobile device for further analysis in various ways, for example via wired USB or Ethernet interface, wireless Bluetooth or Wifi transmission, or removable memory in the form of an SD memory card. However, many manufacturers also refer to the measuring device alone as a data logger, i.e. a module to which sensors are connected externally and, for example, a PC/notebook takes over the recording/storage of the data via software.