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Chapter 4
Mechanical Considerations
Additional Resources for Managing Thermal Conditions
Visit
ni.com/info
and enter the Info Code
sbriocooling
for the following additional
information to help you manage thermal conditions:
•
Examples regarding the effect of the design factors discussed in this chapter
•
Case study examples to help you estimate the achievable external ambient temperature for
a representative system
Shock and Vibration
The mounting method you use, components you select, and assembly techniques you use
influence the ability of the system to resist fretting corrosion and other damage caused by
exposure to shock and vibration. Consider the following factors when designing your
sbRIO-9651 SOM system to account for shock and vibration:
•
In general, shorter SEARAY stack heights perform better than taller stack heights.
•
Directly mounting the sbRIO-9651 SOM heat spreader to a rigid surface provides the best
performance. If this method is not feasible for your design, minimize the amount of extra
mass that only the sbRIO-9651 SOM supports, such as a heat sink or other thermal solution,
that is fastened to the four standoffs. If you require substantial thermal solutions, provide
additional structural support.
•
NI recommends that you use connectors that provide the following benefits:
–
Positive locking
–
Provisions for strain relief
–
Substantial gold plating on pins
•
The connectors on the reference carrier board are representative of connectors that NI has
used and validated for high shock and vibration environments. The connectors and the
sbRIO-9651 SOM have been tested to industry specifications and are recommended, where
possible, for rugged environments.
Exceptions to this recommendation are the barrel jack and Peripheral Module (Pmod)
headers, which have designs that are not positive-locking or do not provide strain relief.
•
NI offers a variety of cable assemblies and other connectivity accessories to complete your
system design. Typically, these accessories include the best available designs, materials,
and plating to maximize performance and longevity in rugged environments.