On some research PowerLabs (35 series, 30 series or SP series) it is possible to independently control the outputs using the software options in the stimulator menu in LabChart. This means that even if you have an ADInstruments current stimulator (FE180 or FE155HC) attached to one output, you can still use the second output as a voltage stimulator.
NB this is not the case for Teaching PowerLabs such as the 26T, 2/26 and 4/26 where the outputs are differential and cannot be controlled independently. In this instance, you will need to decide either to use the isolated stiumulator or the voltage outputs.
For further technical assistance with this or any other issue, please contact ADInstruments Technical Support by clicking HERE.