Service manual

60 E8408A Product Specifications Appendix A
Cooling Specifications
This section lists E8408A mainframe cooling specifications, including:
• Cooling Table
• Cooling Chart
Cooling Table
Cooling Chart Figure A-2 shows E8408A cooling specifications (for all E8408A slots) per
VXI-8 Specification Draft 2.0 and Airflow Test Fixture revision 1.7 with:
• VXI-8 Standard Modules installed in other slots.
• Measurements taken at 1,500 m altitude.
Area Specification/Comments
Cooling Modes High or variable cooling mode switchable on the front panel. Same
fan cools power supply and modules.
High-Speed Fan Mode Maximum airflow all the time.
Variable Fan Speed
Mode:
Fan speed changes between high and low as a function of ambient
and power supply temperatures.
AirFlow Path Air is routed into the mainframe rear and exhausted out the left side
(viewed from the front) when the mainframe is in horizontal
orientation. When the mainframe is rack-mounted, allow 50 mm of
clearance at the rear and left side for proper airflow.
Acoustic Noise* High Speed Fan Mode: <40 dBA.
Variable Fan on Low Speed: <30 dBA.
* Sound power at bystander position one meter in front of mainframe.
Figure A-2. E8408A Mainframe Cooling Capacity
2.0
1.5
1.0
0.5
2.0 4.0 6.0 8.0
0.0
Pressure Drop
Across Module
(mm H 0)
2
Airflow L/S
All
Slots