By PURPLELEC | 15 September 2023 | 0 Comments
Main types of data acquisition cards
At industrial sites, we will install many types of sensors, such as pressure, temperature, flow, sound, electrical parameters, etc. The sensor signals are limited by the site environment, such as the voltage or current signal output by the pressure sensor. If it cannot be transmitted remotely or because there are too many sensors and the wiring is complicated, we will use distributed or remote acquisition cards (modules) to convert the signals into digital quantities with higher precision on site, and then use various remote transmission communication technologies (such as 485, 232, Ethernet, various wireless networks) to transmit data to a computer or other controller for processing. This type of data acquisition card is also considered a type of data acquisition card, but it is more adaptable to the environment and can cope with various harsh industrial environments.
If you are at a better site or laboratory, such as a school laboratory, you can use a capture card such as USB/PCI. Different from common built-in capture cards, external data capture cards generally use USB interface and 1394 interface. Therefore, external data capture cards mainly refer to USB capture cards and 1394 capture cards.
Most of the data acquisition cards focus on collecting analog quantities, digital quantities, thermal resistors, and thermocouples. Among them, the thermal resistors can be considered as non-electrical quantities (in fact, they still need to be collected with current drive in essence). Among them, analog quantity acquisition cards and digital quantity acquisition Cards are the most widely used.
There is a new two-in-one capture card on the market. Two-in-one refers to digital analog capture card, AV+DV capture card, digital and analog two-in-one, digital input and output, and analog interface input (DV/AV/S-video).
Finally, although it is said to be a capture card, it is often required to output control signals in practical applications. Capture cards are widely used in security monitoring, educational courseware recording, large-screen splicing, multimedia recording and broadcasting, conference recording, virtual studios, virtual reality, security X-ray machines, radar image signals, VDR recorders, medical X-ray machines, and CT Machines, gastrointestinal machines, colposcopy, industrial testing, intelligent transportation, medical imaging, industrial monitoring, instrumentation, machine vision and other fields.
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