The SRS mathematics is different then others because it requires correctly positioned cursors to work. If there are no results from the SRS mathematics, check if the cursors are set-up correctly. 

The first cursor (I) has to be placed on the noise floor signal, before the shock. Second cursor (II) has to be placed also on the noise floor, but after the shock.

After that, the cursors I and II need to be locked with the click on these buttons (after the cursors are locked, they change the colour in the recorder).

The channel cursor (yellow cursor) that indicates our position in the timeline of the data file has to be placed at the beginning of the shock.