Instrument Design and Function Description CMU
1100.4903.82 3.4 E-4
Cooling the Instrument
Axial fan in the casing
Axial fan of power supply
Axial fan of FRONT MODULE
Axial fan of RF FRONTEND
The right side panel contains a temperature-controlled axial fan (120
mm x 120 mm x 38 mm), which sucks in cold ambient air at the right
tube of the casing and blows it through the modules via a ventilation
duct and further ventilation slots. The amount of air is controlled via the
width of the slots depending on the power dissipation of the module.
The modules are cooled by the air flow, and the heated air is then
blown out at the left side panel.
In addition, the power supply of the CMU is equipped with its own
temperature-controlled axial fan (80 mm x 80 mm x 25 mm) with a
separate air circulation. The fan sucks in cold air on the left rear side of
the power supply casing and blows out the heat produced in the power
supply on the right rear side of the power supply casing.
For cooling the controller board, the FRONT MODULE is provided with
its own axial fan (40 mm x 40 mm x 10 mm), which sucks in cold
ambient air on the left side of the instrument and blows it out at the
right side panel.
The RF FRONTEND which can process powers up to 50 W is
equipped with an aluminum casing with its own air duct, cooling fins
and a temperature-controlled axial fan (40 mm x 40 mm x 20 mm),
which dissipates the heat by sucking in cold air directly on the right rear
side of the instrument and blowing in out again on the right front side of
the instrument.
The cooling concept makes sure that all components are optimally
cooled so that the complete instrument achieves a high MTBF.
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