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

Asked by yihui
on 19 Sep 2013

What do the x-Coordinate and y-Coordinate mean? And what is the range of y?


How are we supposed to know?

on 19 Sep 2013

i mean,the signal is on oscilloscope,is it Definitely that x represent time,y represent voltage?


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2 Answers

Answer by Azzi Abdelmalek
on 19 Sep 2013
Edited by Azzi Abdelmalek
on 19 Sep 2013
 Accepted answer

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


Ok, have you read the specifications in page 7, it says the output range is 5-50mV

on 19 Sep 2013

so that means when i collect data,the data is 5-50mv?is it the normal pulse oximeter data for people too?

Answer by Image Analyst
on 19 Sep 2013

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.


How are you collecting data? Do you have an oscilloscope hooked up to the thing? Do you have any kind of calibration factor that converts voltage into percent oxygen?

on 20 Sep 2013

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~

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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