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