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Integrate a curve to obtain the area under it

Creator
Creator

Hello,

 

Is there any way to calculate the integral of a curve to obtain the area under that curve in TestLab?

 

Thank you.

2 REPLIES

Re: Integrate a curve to obtain the area under it

Creator
Creator

Here are two ideas about finding the area under a curve.  Because the signals are digitized, the calculations may be a little different than a traditional "area" calculation.

 

Cumulative Approach

 

Consider the original function:

Area.png

 

 

Right click on the Y axis, and select "Processing -> Cumulative: Forward".  Each value in the curve is added up.  The last value is the sum of all values. 

 

Area1.png

 

 

For a digitized signal, the sum of values is considered to be the area (I think).

 

RMS Calculation

 

Or you could use a Double X cursor and do a RMS calculation.  Some consider the RMS of a curve to be equivalent to the area:

Area2.png

 Steps are:

1.  Right click on display and choose "Add Double Cursor -> X"

2.  Right click on Double X cursor and select "Calculations -> RMS"

3,  Make sure double cursors are positioned over frequency range of interest

 

Some other articles on RMS and Double X cursors:

 

Hope this helps.

 

Re: Integrate a curve to obtain the area under it

Creator
Creator

Thank you very much for your suggestions.