
1 System Overview Major Components
28 System Reference, January 2001
Primary Power Box The primary power box inside the support rack contains
the connections to mains, the system’s line switch, the line
breaker, and individual breakers for the switched outlets,
non/switched outlets, the auxiliary power supply and AC/
DC converters.
AC/DC Converters The AC/DC cardcage contains eight resp. four water and
air cooled AC/DC converter boards which supply the
testhead with 385 V DC. Each board supplies one card-
cage.
The Cooling System
In order to achieve the SOC Series’ high level of integra-
tion, all components are water-cooled. The water cooling
not only keeps all important specifications stable but also
avoids noisy fans in the testhead.
The 3rd-generation cooling system supplies cooling water
to the support rack and to the testhead. It is powered by
three-phase AC mains power.
Figure 10 Cooling Unit
The cooling system is connected to the support rack via
four flexible water hoses. Another four flexible water
hoses conduct the cooling water from the support rack to
the testhead and from the testhead back to the support
rack.
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