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Chapter 2
DAQ System Overview
For more information about SCXI, SCC, and 5B Series products, refer to
Note
ni.com/signalconditioning
Cables and Accessories
Custom Cabling
M Series User Manual
.
NI offers a variety of products to use with M Series devices, including
cables, connector blocks, and other accessories, as follows:
•
Shielded cables and cable assemblies, and unshielded ribbon cables
and cable assemblies
•
Screw terminal connector blocks, shielded and unshielded
•
RTSI bus cables
•
SCXI modules and accessories for isolating, amplifying, exciting, and
multiplexing signals; with SCXI you can condition and acquire up to
3,072 channels
•
Low-channel-count signal conditioning modules, devices, and
accessories, including conditioning for strain gauges and RTDs,
simultaneous sample and hold circuitry, and relays
For more specific information about these products, refer to
Refer to the Custom Cabling section of this chapter, the
Considerations
section of Chapter 4,
Device-Specific
Information, for information about how to select
accessories for your M Series device.
NI offers cables and accessories for many applications. However, if you
want to develop your own cable, adhere to the following guidelines for best
results:
•
For AI signals, use shielded, twisted-pair wires for each AI pair of
differential inputs. Connect the shield for each signal pair to the ground
reference at the source.
•
Route the analog lines separately from the digital lines.
•
When using a cable shield, use separate shields for the analog and
digital sections of the cable. Failure to do so results in noise coupling
into the analog signals from transient digital signals.
For more information about the connectors used for DAQ devices, refer to
the KnowledgeBase document, Specifications and Manufacturers for
Analog
2-6
ni.com
Field Wiring
Input, and Appendix A,
.
ni.com
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