See :meth:`StimulusModel<sparkle.stim.stimulus_model.StimulusModel.setReferenceVoltage>`

def setReferenceVoltage(self, caldb, calv):
        """See :meth:`StimulusModel<sparkle.stim.stimulus_model.StimulusModel.setReferenceVoltage>`"""
        self.caldb = caldb
        self.calv = calv
        for test in self._tests:
            test.setReferenceVoltage(caldb, calv)