Dinamap Pro 100V2 Wartungshandbuch PDF herunterladen (Seite 48)

3-8 PRO 100-400 V2 Patient Monitor Service Manual Revision A

2009829-001

Theory of Operation: 3.3 FUNCTIONAL DESCRIPTION

16 Bit ADC, Primary Processor, and Secondary Processor. The

Primary Processor services and controls the Patient Parameter

Interface (PPI) devices and display backlighting. The Secondary

Processor controls the seven segment LED display, sound

generation, real time clock, and system timing verification. The

processors receive DC power from the PSU PWA. When the PPI

devices transmit analog data to the Main Board A/D converter, the

Primary Processor perform algorithm calculations. Once all the

calculated parameter values are compiled, the data is then

transmitted to the LCD and printer via Secondary Processor.

Concurrently, the calculated parameter values are being stored in the

non-volatile RAM. Calibration and other variable settings are stored in

the Electrically Erasable Programmable Read Only Memory

(EEPROM).

The Main Board backup voltage, derived from either NiMH battery or

an external power source, appears on the Main Board supervisory

circuit. The Main Board supervisory circuit generates the RESET and

HALT signal for the Primary Processor. It also, allows EXTERNAL DC

voltage to the RAM and Secondary Processor when the system is ON

or battery backup voltage to power the RAM and Secondary

Processor when the system is OFF.

If the Primary Processor fails to reset its watchdog timer, the Primary

Processor sends a low level on its watchdog output to the Pneumatic

Control Gate Array Logic (PCGAL). If the Primary Processor detects

system faults or overpressure, it will notify the Secondary Processor

of system failure condition. The Secondary Processor in turn, sends a

FAILSAFE signal to the PCGAL and Tone Generator. When the

PCGAL receives the FAILSAFE signal, it sends a DEFLATE signal to

the Pneumatic Valves to depressurize the system to atmosphere.

Once the Tone Generator receives the FAILSAFE signal, it sends an

audio frequency (ALARM signal) to the speaker. During the fail-safe

mode the following will also occur:

 Parameter monitoring disabled

 Remote alarm control inactive

 Graphic LCD displays fault error code

 Pneumatic safe state (deflate the cuff, pump off)

 Normal communications interface disabled

 Hard keys and rotary switch inactive

When a low or high ambient room lighting occurs, the Primary

Processor uses it’s supervisory circuit to increase or decrease the

graphic backlighting, automatically.

3.3.4 SPO2 PWA (Optional)

The SPO2 PWA provides continuous readings of oxygen saturation

and pulse rate. Additional circuitry provides power, data

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