1261B User Manual
Specification A-4
Racal Instruments
Ó
1995
Table A-3, Cooling
Characteristic
Description
Per Slot Cooling Capacity
Typically 80 W per slot @ 3.5 mm H
2
0 with
airflow directors.
Figure A-1
shows the
worst slot cooling curve of the mainframe.
Tested per VXI-8 Rev 2.0
Cooling System
Forced air circulation (positive
pressurization).
Fan Speed Control with EMS or SMS
A rear panel switch chooses between full
speed and variable speed. On the chassis
with EMS, the slot exhaust air temperature
and ambient air temperature are monitored
to maintain a constant temperature rise
across the installed modules.
Fan Speed Control without EMS or SMS
A rear switch on the fan assembly chooses
between full speed and low speed. On the
chassis without EMS or SMS, the chassis
runs quieter when operated outside the rack.
Slot Airflow Direction
P2 to P1, bottom of module to the top of
module
Mainframe Intake, Bench Top
Bottom rear of mainframe
Mainframe Exhaust, Bench Top
Top of mainframe.
Mainframe Intake, Rack Mount Model
Bottom sides of mainframe, consistent with
industry rack mount cooling practice
Mainframe Exhaust, Rack Mount Model
Rear of mainframe, top rear of mainframe,
consistent with industry rack mount cooling
practice.
Filter Access (Power Supply and Module
Fans)
Filter accessible from rear of the mainframe
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