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Nellcor Pulse Oximeter Probe |
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Disposable
Across pins 2 and 3, I see different voltage drops depending on polarity; so I think the single 2-pin package connected to those pins is actually both IR and red LEDs together, and the instrument would probably apply first one polarity, then the other, to alternately measure conductance of IR and red light through the patient's finger. For more theory of operation see: http://www.mcc-med.de/homepage/pdf/po300_d.pdf (page 11 of which PDF correlates well with this pinout) and http://www.bioe.psu.edu/SeniorDesignProjects/SD2006/DFord/bioe450%20web%20page.htm | ||||||||||||||||||||||||||||||||
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