How to specify two measurements for computing room acoustics parameters?

Two measurements are to be used to calculate parameters such as IACC and LF. When doing this, the primary measurement (omni-directional mic.) is the active measurement in the upper plot and the secondary measurement (figure-of-eight mic.) is set to be the active measurement in the lower plot. If only one plot is displayed and not two, the active measurement in the lower plot is found in the Measurement Selection Toolbar as shown below

We recommend using this toolbar shown below to check that you have got the right impulse responses.

More:

Specifying the secondary measurement does not help, why?

Limitations when plotting parameters needing two measurements