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Functional description
Document No. 8000060-1
9
Signal processing
Two signals from the pressure transducers are amplified and sent to A/D converter. After the
converter, digitized signals are sent to microprocessor for data processing. Before the converter,
one of the signals is used to adjust the offset to the pressure safety level.
The NIBP module is controlled with 80C51FA microprocessor at 16 MHz oscillator frequency.
Memory
NIBP program memory (EPROM) size is 128k
×
8. RAM size is 32k
×
8 bit and it stores variable
values in NIBP measurement. EEPROM is size 64
×
16 bit and is used to store the calibration
values for the pressure transducers, the pulse valve constants gained during measurements, the
PC board identification, and module serial number.
Software control
Software controls valves and pump. In addition to the individual on/off signals for each
component, there is a common power switch for the valves and the pump that can be used at
pump/valve failures.
In addition to external reset line, the microprocessor system is equipped with its own power-up
reset.
Watchdog timer
The NIBP module is equipped with a software independent safety circuit to disconnect supply
voltages from the pump and the valves if the cuff has been pressurized longer than the preset time.
Pressure limit is specified to 5 mmHg. As soon as the cuff pressure rises over 5 mmHg, a timer
starts counting. The timer is adjusted to stop the pump and open the valves in 2 minutes 10
seconds in adult/child mode and in 1 minute 5 seconds in infant mode.
Содержание F-LM1
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