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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
4-18 SECTION 4 – HARDWARE DESCRIPTION
Figure 4-14: Preprocessor PCB
BUILT-IN TEST CARD
4:34. The Built-in Test (BIT) operation is a diagnostic mode of the DPS4D used to determine the system
state of health. The BIT operation reads data from sensors incorporated in the hardware as shown in Figure
4-15. The Control Platform commands the BIT card to collect sensor signals in the multiple operating con-
figurations of the DPS4D so as to evaluate collected information for determination regarding the status of
both directly and indirectly sensed Digisonde
®
components. Further description of BIT function is provided
in Section 6.
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