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1260-22 User Manual
Module Operation 3-14
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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
O. For the case above, with an airflow of 4.7
2
liters/sec the pressure drop read from Figure 3-4 is .4mm
H
O.
2
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.
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.
EADS North America Test and Services
Publication No. 980673-055 Rev. A
CAUTION:
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