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I am currently trying to understand the following paper: 

On the nonlinear electromagnetic coupling between a coil and an
oscillating magnet

http://iopscience.iop.org/article/10.1088/0022-3727/43/29/295005/meta

It is very interesting, but I am having troubles to understand how they calculated, or what they meant exactly when they write:

For each oscillation point, the steady-state voltage across the load resistor was measured, thus allowing the amplitudes of the first four harmonics of the forcing frequency to be determined.

My question is:

What do they mean by "steady state" ? The voltage is constantly changing when the magnet is moving in the coil.

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    $\begingroup$ I haven't read the paper at the link but, typically, steady state means that any transients have decayed to insignificance and the response is just that due to the forcing function. $\endgroup$
    – Alfred Centauri
    Commented Apr 8, 2018 at 20:41

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