Discussion

We summarize our findings now. For the first order analysis, the gain is 0.23 and the time constant $\tau$ is 58.64 seconds. For the second order analysis, the initial inflexion is well captured with the two time constants $\tau_1$=57.39, $\tau_2$= 1 and gain = 0.235. Negative steps can also be introduced to make the experiment more informative. One need not keep a particular input constant. By varying both the inputs, one can imagine it to be like a step varying disturbance signal.