Chapter 2 DAQ System Overview
X Series User Manual 2-8 ni.com
USB Screw Terminal Device Accessories
NI offers a variety of products to use with USB Screw Terminal X Series
devices, as follows:
• USB X Series mounting kit—Part number 781514-01
• USB X Series mounting kit with DIN rail clip—Part
number 781515-01
• USB cable with locking screw, 2 m—Part number 780534-01
• Universal power supply with mini-combicon connector,
12 VDC, 2.5 A—Part number 781513-01
Signal Conditioning
Many sensors and transducers require signal conditioning before a
measurement system can effectively and accurately acquire the signal. The
front-end signal conditioning system can include functions such as signal
amplification, attenuation, filtering, electrical isolation, simultaneous
sampling, and multiplexing. In addition, many transducers require
excitation currents or voltages, bridge completion, linearization, or high
amplification for proper and accurate operation. Therefore, most
computer-based measurement systems include some form of signal
conditioning in addition to plug-in data acquisition DAQ devices.
Sensors and Transducers
Sensors can generate electrical signals to measure physical phenomena,
such as temperature, force, sound, or light. Some commonly used sensors
are strain gauges, thermocouples, thermistors, angular encoders, linear
encoders, and resistance temperature detectors (RTDs).
To measure signals from these various transducers, you must convert them
into a form that a DAQ device can accept. For example, the output voltage
of most thermocouples is very small and susceptible to noise. Therefore,
you may need to amplify or filter the thermocouple output before digitizing
it. The manipulation of signals to prepare them for digitizing is called
signal conditioning.
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