code: def getSignalHeader(self, chn):
          
          return {'label': self.getLabel(chn),
                  'dimension': self.getPhysicalDimension(chn),
                                   'sample_rate': self.getSampleFrequency(chn),
                  'physical_max':self.getPhysicalMaximum(chn),
                  'physical_min': self.getPhysicalMinimum(chn),
                  'digital_max': self.getDigitalMaximum(chn),
                  'digital_min': self.getDigitalMinimum(chn),
                  'prefilter':self.getPrefilter(chn),
                  'transducer': self.getTransducer(chn)}
docs: Returns the  header of one signal as  dicts
  
          Parameters
          ----------
          None