If we’re talking about the inductance parameter, that’s literally a point along the impedance plot, either at 1 or 10kHz, so the plot is pretty much a necessity for that. But there is a handful of parameters that you can measure without it. I’ve also just uploaded a new video about measuring the T/S parameters. You can find it here: https://youtu.be/XDL4_TIRTu4

Is it possible to obtain them without generating impedance plots in free air and a reference enclosure?

If we’re talking about the inductance parameter, that’s literally a point along the impedance plot, either at 1 or 10kHz, so the plot is pretty much a necessity for that. But there is a handful of parameters that you can measure without it. I’ve also just uploaded a new video about measuring the T/S parameters. You can find it here: https://youtu.be/XDL4_TIRTu4