1261B User Manual
Understanding The 1261B 6-4
Racal Instruments
Ó
1995
Backplane
Interconnections
The Power On/Standby switch (S100) connects to the backplane
through a polarized locking wire-to-board header at J54.
The front panel display module and the temperature monitor
board connect to the backplane through a 24-pin ribbon cable
IDC header at J50.
The module cooling fans connect to the backplane through a
polarized locking wire-to-board header at J56.
The power supply mates with the backplane through board-to-
board connector J52.
The monitoring system module mates with the backplane
through a board-to-board connector at J51.
Cooling System
The Module Fan assembly, located at the bottom rear of the
mainframe, houses three cooling fans. The speed of these fans
is controlled to maintain a temperature rise of
#
10
E
C across any
module slot in the mainframe. In high ambient temperature
conditions of
$
40
E
C, the fans shall run full speed.
Rack Mount
Cooling System
Module cooling air enters at the bottom sides of the 1261B Rack
Mount mainframe and is filtered as it is drawn through the fan
assembly.
The incoming air is forced downward into a pressurized plenum
below the VXI modules. The high pressure in the plenum forces
the air up through a metered plate into the VXI modules. The air
passing over components in the modules absorbs heat and exits
at the top of the module.
The 1261B Rack Mount mainframe exhausts module cooling air
at the rear of the mainframe.
Bench Top Cooling
System
Filtered air enters at the bottom rear of the 1261B Bench Top
mainframe through the fan assembly.
The incoming air is forced downward into a pressurized plenum
below the VXI modules. The high pressure in the plenum forces
the air up through a metered plate into the VXI modules. The air
passing over components in the modules absorbs heat and exits
at the top of the module.
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