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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?

Azzi Abdelmalek on 19 Sep 2013

How are we supposed to know?

yihui 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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Answer by Azzi Abdelmalek on 19 Sep 2013
Edited by Azzi Abdelmalek on 19 Sep 2013

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

Azzi Abdelmalek on 19 Sep 2013

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

yihui 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.

Image Analyst on 19 Sep 2013

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?

yihui 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~

Image Analyst on 20 Sep 2013

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.