22 SBC347A 3U VPX Single Board Computer
Publication No. 500-9300527837-000 Rev. A.0
4.3 Board Installation Notes
1. The VPX specification allows for a variety of different backplane pinouts
depending on the mix of differential and single ended connectors. Ensure
that the pinout of the SBC347A matches that of the backplane slot before
insertion.
2. Air-cooled versions of the SBC347A have an injector/ejector handle to ensure
that the backplane connectors mate properly with the backplane. The captive
screws at the top and bottom of the front panel allow the board to be tightly
secured in position, which provides continuity with the chassis ground of
the system.
3. Conduction-cooled versions of the SBC347A have screw-driven wedgelocks
to provide the necessary mechanical/thermal interface. Correct adjustment
requires a calibrated torque wrench with a hexagonal head of size
3
/
32
”
(2.38 mm), set to between 0.6 and 0.8 Nm.
4. In an air-cooled development enclosure, when taking I/O connections from
the backplane connectors, use of Abaco I/O modules (or some equivalent
system) ensures optimum operation of the SBC347A with regard to
electromagnetic interference (EMI). See the VPX I/O Modules manual for
more details.