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1260-22 User Manual Publication No. 980673-055 Rev. A
Module Operation 3-14 EADS North America Test and Services
required airflow (liters/sec) is forced through the module.
This can be determined by looking at pressure drop vs.
airflow plot for the 1260-22 Module in
Figure 3-4
. Find the
required airflow and then read the corresponding pressure
in mm H
2
O. For the case above, with an airflow of 4.7
liters/sec the pressure drop read from
Figure 3-4
is .4mm
H
2
O.
4. Plot the 1260-22 operating point (Pressure, Airflow) on the
chassis cooling curve. If the module operating point lies
under the chassis curve, the module should remain within
the specified temperature. An example of a 1260-22
Module in a 1261B VXI Chassis is shown in
Figure 3-4
.
The chassis airflow plotted is for the worst case slot
airflow. In the 1261B chassis, the 1260-22 could dissipate
up to about 65 Watts in any slot without much concern for
the temperature rise of 10
°
C being exceeded.
Above 65
Watts, special considerations must be given to
cooling. Either more air must be forced through the
slot or a temperature rise greater than 10
°
C will occur.
CAUTION:
The required airflow may need to be increased or
decreased depending on airflow distribution across the
module, the ambient temperature and reliability issues.
Consult the VXI specification for more details.
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