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Digital Section
Figure 4-7 shows the Digital Section block diagram.
The digital section consists of the A2 CPU Board Assembly and other peripheral assemblies
such as the keyboard and LCD. The section communicates with the A1 Main Board Assembly in
order to control the latches, switches, and other components on the A1 assembly and receive
the measurement data. The GPIB interface on the A2 Assembly allows the 4338B communicate
with a controller. A handler interface on the A1 Assembly allows the 4338B communicate with
an external handler.
The A2 CPU Board Assembly includes a processor, ROM, EEPROM, jumpers, switches, and
LEDs.
ROM (A2U11) stores the rmware which controls all the 4338B's operation and functions. The
ROM is mounted in a socket for easy replacement.
The EEPROM (A2U1) stores the unit unique data, such as the adjustment data and the operator
unique data, such as the operator saved measurement setup condition. The EEPROM will
not lose its data when power is turned o . The EEPROM is mounted in a socket for easy
replacement.
Jumpers and switches set the 4338B's conditions. Refer to Appendix B for more information.
T roubleshooting
4-9
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