Table of Contents
Advertisement
I
GENERAL INFORMATION
TABLE 1-1. HVHE135/136 SPECIFICATIONS (cont.)
Characteristic
Part projections:
Component side
Solder side
Connectors:
VMEbus/VSBbus
RS-232C
1.3.1 Cool ing Requirements
Specification
0.50 inch (1.27 cm) maximum
0.067 inch (0.17 cm) maximum
DIN triple row, 96-pin male (PI, P2)
DB-9, 9-pin female (J9, J10)
Motorola VMEmodules are specified, designed, and tested to operate
reliably with an incoming air temperature range from 0 degrees C to
50 degrees C (32 degrees F to 122 degrees F) with forced air coo 1 i ng.
Temperature qualification is performed in a standard Motorola
VMEsystem 1000 chassis. Twenty-five watt load boards are inserted
in the two card slots, one on each side, adjacent to the board under
test to simulate a high power density system configuration.
An
assembly of three axial fans, rated at 100 CFM per fan, is placed
directly under the MVME card cage. The incoming air temperature is
measured between the fan assembly and the card cage where the
incoming airstream first encounters the board 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 speci fi cat ions 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 flowing over the module.
Less air flow 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 50 degrees C
with increased air flow.
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 of air flowing over a module.
1.3.2 FCC Compl iance
The MVME135/136 module is tested in an FCC-compliant chassis, and
meets the requirements for Class A equipment. FCC compliance was
achi eved under the foll owi ng condi
t
ions:
1-4
Advertisement
Table of Contents
