'power' and 'size' in the power spectrum?

When I choose "power at the stage of the power spectrum, numbers in my data were negative. I don't understand why. What is the difference between "power" and "ten factor"?

And what are the "dB" and "linear" in the average of actual size selection? "DB" means the following equation? Vnorm = 20 * log10 (Vnorm)? 'Linear' means greatness?

Thank you very much!


Tags: NI Products

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