Table 3-2: Dynamic Operating Range - Mallinckrodt NELLCOR NPB-4000 Service Manual

3.3.4.1.4 LED Excitation Test
Note: A "*" indicates values that produce an alarm. Press the Alarm Silence
switch to temporarily silence the audible alarm.

Table 3-2: Dynamic Operating Range

SRC-2 Settings
RATE LIGHT MODULATION
38 HIGH2 LOW
112 HIGH1 HIGH
201 LOW LOW
201 LOW HIGH
Note: For the pulse rate setting of 201 BPM, the pulse rate tolerance of 195 to
207 BPM is greater than the ±3 BPM accuracy specification of the
monitor, due to the performance characteristics of the SRC-2 tester.
4. Turn monitor off.
This procedure uses normal system components to test circuit operation. A
Nellcor Oxisensor II oxygen transducer, model D-25, is used to examine LED
intensity control. The red LED is used to verify intensity modulation caused by
the LED intensity control circuit.
1. Connect EC-8 sensor extension cable to monitor.
2. Connect D-25 sensor to sensor extension cable.
3. Press On/Standby switch to turn monitor on.
4. Leave sensor open with LEDs and photodetector visible.
5. After monitor completes normal power-up sequence, verify sensor LED is
brightly lit.
6. Slowly move sensor LED in proximity of photodetector element of sensor.
Verify; as LED approaches optical sensor, LED intensity decreases.
7. Open sensor and notice LED intensity increases.
8. Repeat step 6 and intensity will again decrease. This variation is an
indication that microprocessor is in proper control of LED intensity.
9. Turn NPB-4000/C off.
Section 3: Performance Verification
NPB-4000/C Indications
SpO Pulse Rate
2
79 - 83* 35 - 41*
79 - 83* 109 - 115
79 - 83* 195 - 207*
79 - 83* 195 - 207*
3-7