When you have the Power Spectrum window open there is a control that specifies whether you are normalized or not (check means it is). By default this check is on.
I strongly encourage you to watch our basics video which outlines much of what you are asking about with this structure, particularly in regards to analysis. This can be found at <a href=”https://www.gotostage.com/channel/d900ec5d9e904423aa1e873d8dc5df83/recording/9d2816e75e7c474a8fb8756040f92b52/watch”>https://www.gotostage.com/channel/d900ec5d9e904423aa1e873d8dc5df83/recording/9d2816e75e7c474a8fb8756040f92b52/watch</a>, you will need to login.
Scott