Hi @Phil_D Actually this gain selection happens in the library behind the API/SDK which is also used the application. The high gain is selected when the Range is equal or lower than 5V (pk2pk), Offset is withing +/- 2.5V and also if the trigger on a channel is selected the level of this is withing 5V pk2pk range. This 5V/2.5V should be multiplied with the attenuation when used. After applying the AnalogIn configuration you can use the FDwfAnalogInChannelRangeGet to see the exact A