Cardiac Output Modules, M-COP and M-COPSv
Document No. 8001012-1
7
2.2.1
COP board
The COP board consists of the following functional sections.
•
Processor
•
Cardiac output measurement
•
Cardiac output self test
•
Invasive blood pressure measurement
•
Serial communication
•
Isolation
•
Power supply
Processor section
The microprocessor uses the Intel 80C196KC-16 CPU which includes three A/D converters and a
UART. The microprocessor uses external memories, an 8-bit data bus, a 16 MHz oscillator, and a
watchdog timer. The three A/D-converters within the CPU convert the analog input signals to
digital. The internal UART communicates and transfers data between the module and the CPU
board in the monitor.
Cardiac output measurement section
The catheter and the probe contain an NTC resistor that reacts to temperature change.
The temperature dependent voltage across the NTC resistor is amplified and an offset value is
added to it. The resultant signal is then regulated into a
±
5 V range by voltage slicing and sent to an
A/D converter.
Because the temperature measurements are calibrated digitally and non-linearity of
catheter/probe is compensated by software, ambient temperature change after calibration is the
only factor that may influence the measurement.
Cardiac output self test
The Cardiac Output Module, M-COP contains a C.O. Self Test connector.
When the cable is connected to the C.O. Self Test connector, the microprocessor starts the test
program automatically. First, the microprocessor measures 30 °C, then it activates test circuits
and measures 37 °C and 41 °C.
If the values are not correct ‘Cable fault’ is displayed and there is a fault is either in the module or in
the catheter connecting cable.
Содержание S/5 M-COPSv
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