Led excitation test, Led excitation test -28 – Philips 862478 User Manual
Page 78
Performance Procedures
4-28
Testing the Monitor
LED Excitation
Test
This procedure uses normal system components to test circuit operation. A SpO2, adult
finger, reusable sensor is used to examine LED intensity control. The red LED is used to
verify intensity modulation caused by the LED intensity control circuit.
Step
Action
1
Connect an SpO
2
sensor to the monitor.
2
Press the On/Standby button to turn the monitor On.
3
After the monitor completes its normal power-up sequence, verify that the sensor
LED is brightly lit.
4
Slowly move the sensor LED in proximity to the photo detector element of the
sensor. Verify, as the LED approaches the optical sensor, that the LED intensity
decreases.
5
Open the sensor and take note that the LED intensity increases.
6
Repeat Step 5 and the intensity again decreases. This variation is an indication
that the micro-processor is in proper control of LED intensity.
7
Turn the monitor Off.