
4 Test Head Filling and DUT Board Considerations Overview of Test Heads
60 System Reference, January 2001
Structure of Card Cages
Figure 28 illustrates the structure of a card cage.
Figure 28 Input of a card cage
A card cage has the following content:
• CLOCK DIST refers to the clock signal distribution in
each single cage run by a clock board receiving their
clock signals from a distributing master clock situated
in only one of the cages.
•In two to four of the card cages there is a high preci-
sion High Precision Parametric Measurement Unit
(HPMU).
• UTIL referes to utility lines inherent in the card cages.
• The 8 so called SLOTs contain the previously
mentioned digital boards or analog modules.
• The device power supply is run by the PDPS.
•The DC PS slots contain DC DC converters for two of
the SLOTs each.
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