User manual

Hardware Description
ComTec GmbH 3-5
3.3. BASE Module
3.3.1. General
The MPA-3 BASE module is the heart of the MPA-3 multiparameter system. It provides the
interface to the PC as well as the interface to the subsequent modules which, so far may be up to
three Quad ADC Port
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modules. Besides, the BASE module already includes four ADC ports for
the connection of external ADCs, Multiscalers, Position Analyzers, Time-of-Flight units etc. The
BASE module also distributes the power to the subsequent modules.
In COINCIDENCE mode of operation it detects and evaluates coincident arriving ADC events.
3.3.2. Signature PLD
On the BASE module's printed circuit board a 20 pin DIL socket holding a programmable logic
device (PLD) that contains specific information on the individual MPA-3 system. Particularly it
holds an encrypted unique serial number of the very system. This information can be obtained
from the MPA-3 Server program and is used for support purposes (ref. Figure 5.6 on page 5-5).
3.3.3. Power Supply
The MPA-3 system is powered by the 5V PC power supply. The power connection is basicly done
by the FHS Link cable. For higher power consumptions an 'Extra Power Cable' is optionally
available.
For system configurations where the voltage drop across the FHS Link cable is low – e.g. since
only one module is connected, the FHS Link is a short cable etc. - the FHS Link cable provides all
the supply current required. When more power is needed than the FHS Link cable is able to
provide an extra power input connector (POWER IN) for the optional 'Extra Power Cable' is
provided on the rear of the BASE module. A frontside LED marked "POWER " indicates whether
the power supply is sufficient or not. When the 'POWER' LED is not illuminated the 'Extra Power
Cable' must be installed.
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Number and types of modules applicable may increase in the future
Figure 3.6: BASE module front view