Datex-Ohmeda Aestiva 7900 SmartVent, Техническое справочное руководство

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4a Tests and Calibration 4.X Software
1006-0453-000 05/04 4a-3
4a.1 Self tests
The Aestiva 7900 Ventilator software includes self tests that determine
whether or not the operating software is functioning properly and whether or
not the electronic circuits on the circuit boards are functional.
The self tests include:
• Powerup tests
• Continuous tests
• Periodic tests
Powerup tests
The following is a list of the tests run at powerup:
• Sequential watchdog
• Logical watchdog
• Data RAM walking pattern test
• FLASH ROM CRC verification
• Gas inlet valve test (electrical and pneumatic)
• Calibration of the manifold sensor
If one or more of these tests fail, the display provides a readout of the
problem.
The On and Off states of the Gas Inlet Valve (GIV) are tested at power up. The
manifold pressure will be tested to determine pass/failure. If the GIV causes
the self test to fail on power up, an alarm sound and the message “Gas Inlet
Valve Failure” is displayed.
If the calibration of the manifold sensor fails on power up, an alarm sounds
and the message “Manifold Pressure Sensor Failure” is shown.
Continuous tests
These tests are run continuously during normal operation and alarms are
associated with each test. A failure causes an alarm to display on the screen
in the alarm display area.
• Flow valve electrical feedback
• Supply voltage checks
• Battery voltage checks
The flow valve feedback signal is tested in non-mechanical and mechanical
ventilation states. The flow valve is closed in non-mechanical ventilation.
Periodic tests
These tests are run every 30 seconds during normal operation. Alarms are
associated with each test. A failure causes an alarm to display on the screen
in the alarm display area.
• CPU Test
• Display RAM walking pattern test
• Data RAM walking pattern test
• FLASH ROM CRC verification