6.1
BD4000 Micro Section
Real Time Clock
, this enables the micro to display and print the date/time on
the trace. User setup information is held within the internal memory of the
clock.
Watchdog Timer
, this monitors the micro and checks for any system errors.
Upon detecting a system error the micro is reset. All controls revert to
switch-on settings.
Event Marker
, this patient event marker records a mark on the printout in a
different place from the clinical event marker accessed via the front panel (see
user manual).
Serial Ports
, the rear connector PCB supports two D-type RS232 connectors
for external interfacing and twins mode communication.
Display PCB
, is mounted on the top half of the case moulding and consists of
two separate PCBs joined by a short ribbon cable. This PCB also carries the
system controls.
ROM
, the ROM memory contains the program.
RAM
, the main PCB has three RAM IC's, two are used on the Digital Signal
Processing section and the third for data processing by the micro.
Digital Signal Processor
, processes the information from the ultrasound and
ECG transducers implementing autocorrelation and ECG detection for deriving
the FHR.
Issue: 2 DRAFT
17
Rev: a
614365
