When I plot Onoise in a Probe AC Analysis, how do I know which node it is referring to?
The Onoise waveform will always refer to the Noise Output node specified in the AC analysis limits dialog box. To access the limits dialog box in probe, go to the Probe menu and select Limits or just hit the F9 hotkey. The Noise Output field should be specified with either the node name or the node number of the desired output node. The Noise Input is also specified in this same dialog box and should be defined with the Part attribute name of a source.