Kontron AT8404 - Manual (Page 123)

Thermal Considerations
110 AT8404 User Guide
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In configuration B, all four AMC slots are populated with air blocker modules. The air blockers simulate the
maximum component envelope which is allowed on an AMC. This corresponds to the highest possible air
impedance.
Figure 5-3: Configuration B - Airflow Measurement
The airflow through the AT8404 component area behind the AMC connectors is well balanced due to the
impedance given by the power mezzanine. This prevents excessive air bypass when the AMC area is loaded
with high impedance AMCs.
Partially stuffed AT8404 or AT8404 with low profile AMCs should use blank fillers or other means providing
sufficient flow resistance to get close to the CP-TA impedance reference curve.
0
10
20
30
40
50
60
70
80
90
100
0 0,2 0,4 0,6 0,8 1 1,2 1,4
Airflow (CMM)
Pr
es
su
re
(
P
a
)
Front Board Reference
0,00
0,02
0,04
0,06
0,08
0,10
0,12
0,14
1 2 3 4 5 6 7 8
Test Section
CM
M