What do the x- and y-axes of this pulse oximeter signal represent?

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yihui
yihui 2013-9-19
What do the x-Coordinate and y-Coordinate mean? And what is the range of y?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-9-19
编辑：Azzi Abdelmalek 2013-9-19
You can read about Pulse_oximetry
the range of y depends on your Pulse_oximetry, you have to read its characteristics.y is a voltage which is related to Molecular oxygen concentration, this relation is also is given in your Pulse_oximetry characteristics
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Azzi Abdelmalek
Azzi Abdelmalek 2013-9-19
Ok, have you read the specifications in page 7, it says the output range is 5-50mV
yihui
yihui 2013-9-19
so that means when i collect data,the data is 5-50mv?is it the normal pulse oximeter data for people too?

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Image Analyst
Image Analyst 2013-9-19
x is most likely time. If it's an oscilloscope, the y is voltage but if it's a custom program, y could represent "percent oxygen" or something else.
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yihui
yihui 2013-9-20
yeah,i use oscilloscope to see the signal,and use one device that is provided by my teacher to store the data,and the data i think is just represent the voltage~
Image Analyst
Image Analyst 2013-9-20
Well to convert to %O you're going to need a calibration factor to convert your voltage into %O. Consult your manual or teacher for assistance.

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