Page 16 - 2021 Connectivity Components: Everything but the Connectors eBook

16
2. Backshells for EMI and strain relief protection
When specifying micro-D terminated cables, designers should consider using backshells to protect the cable. Backshells provide durable protection against electromagnetic interference (EMI) that can distribute data and signal within the cables. Additionally, backshells provide mechanical strain relief to tight bending that can occur at the point the wires are exposed from the epoxy encapsulant. Backshells also provide a mount for braided sleeves and abrasion protection sleeves to link to the connector. A fully assembled exposed cable with a micro-D connector will include a backshell braided sleeve and abrasion protection. Some suppliers provide these fully shielded cable assemblies as a single part number, which reduces the amount of manual assembly and has superior “factory installed” quality.
Backshells are gender-neutral and are sized for the number of positions of the connector. Most are machined from aluminum and come plated in cadmium or nickel. They are typically ordered for straight wire entries, but angled and right angle are also available. They mount directly to the connector with elongated jackscrews passing through the micro-D mounting holes. C-clips or retaining rings are used with the elongated jackscrews to hold the backshell and connector together until final assembly.
» Micro-D connector saver for 37-position micro-Ds
3. Connector savers for testing assembled subsystems
Micro-Ds are often used on high-value military systems. These systems are tested rigorously and must withstand multiple connector mating cycles. Connector savers reduce wear on the contacts and maintain the highest connector retention and lowest contact resistance. They provide a short jumper to the system’s connector and are used in quality labs where multiple electrical tests are required.
Connector savers are gender-neutral. They are constructed of a plug and socket, creating a short jumper. An installed socket is still tested as a socket, but with the connector saver in between.
Not all connector applications are simple and able to be completely serviced by the connector alone. A design engineer must become familiar with the additional components available and their functions in order to provide a more capable assembly with improved durability, ultimately reducing product failures in the field.
Visit Cinch Connectivity Solutions to learn more.