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a high power density system configuration. An assembly of three axial fans,
rated at 100 CFM per fan, is placed directly under the VME card cage. The
incoming air temperature is measured between the fan assembly and the card
cage, where the incoming airstream first encounters the module under test.
Test software is executed as the module is subjected to ambient temperature
variations. Case temperatures of critical, high power density integrated
circuits are monitored to ensure component vendors specifications are not
exceeded.
While the exact amount of airflow required for cooling depends on the
ambient air temperature and the type, number, and location of boards and
other heat sources, adequate cooling can usually be achieved with 10 CFM and
490 LFM flowing over the module. Less airflow is required to cool the module
in environments having lower maximum ambients. Under more favorable
thermal conditions, it may be possible to operate the module reliably at higher
than 55˚ C with increased airflow. It is important to note that there are several
factors, in addition to the rated CFM of the air mover, which determine the
actual volume and speed of air flowing over a module.
FCC Compliance
The MVME197 was tested in an FCC-compliant chassis, and meets the
requirements for Class A equipment. FCC compliance was achieved under the
following conditions:
1.
Shielded cables on all external I/O ports.
2.
Cable shields are connected to earth ground via metal shell connectors
bonded to a conductive module front panel.
3.
Conductive chassis rails connected to earth ground. This provides the path
for connecting shields to earth ground.
4.
All chassis and MVME197 front panel attachment screws are properly
tightened.
For minimum RF emissions, it is essential that the conditions above be
implemented; failure to do so could compromise the FCC compliance of the
equipment containing the module.
Equipment Required
The following equipment is required to make a complete system using the
MVME197DP/SP:
System console terminal
Disk drives and controllers
MVME197/D1
Equipment Required
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