Nellcor N-180, Manual

Page: 67 / 83

Section 7: Performance and Safety Tests
7-9
c. Uncover detector.
d. Move sensor LEDs nearer sensor photodiode.
Notice that increasing the light near the photodiode makes
LED intensity decrease.
e. Read RAM location five and then read
RAM
location six.
Note the value of location six has also decreased. The lowest
value is less than 50.
f. Open sensor (move LEDs away from photodiode).
After 10-30 seconds the LEDs return to high intensity.
g. Press buttons again, adjust control knob to
RAM
location five
and then back to six.
Note the value of location six has also increased.
■
LED RCAL Calibration Factor
1. Remove the D-25 from monitor.
2. Simultaneously press and hold HIGH SAT and audio alarm off
push buttons and observe front panel display.
3. Select RAM location three in OXYGEN SATURATION display.
The number in the PULSE RATE display must be 62. This step
verifies proper operation of the RCAL determination circuit when
nothing is connected.
4. Connect RCAL LO test resistor to sensor input.
The number in the PULSE RATE display must be 64. This step
verifies proper operation of the RCAL determination circuit at the
low end.
5. Remove RCAL LO test resistor from patient module and connect
RCAL HI test resistor to sensor input.
6. Simultaneously press and hold HIGH SAT and audio alarm silence
push buttons and observe front panel display.
7. Select
RAM
location three in OXYGEN SATURATION display.
The number in PULSE RATE display must be 84. This step verifies
proper operation of RCAL determination circuit at high end.
Normal Operation
Normal operation tests the monitor using a live subject. The test is an overall
performance check of the monitor. This procedure includes the
LED
excitation
test and the patient monitoring test.
■
Patient Monitoring
1. Connect monitor to AC power source at your location. Observe
operating voltage markings on monitor back panel.
2. Place ON/STDBY switch to ON and verify monitor is operating.