def METHOD_NAME(self):
    msg = '{0:8}\t{1:4}\t{2:4}\t{3:<8}\n'.format(
                'Name', 'Module', 'Channel', '   Current')
    # print overview sorted by channel names
    for ch_name, ch_map in sorted(self.channel_map.items()):
        I = self.get(ch_name)
        scale_fac, unit = SI_prefix_and_scale_factor(I, 'A')
        msg += '{0:8}\t{1:4}\t{2:4}\t{3:>8.2f} {4:4}\n'.format(
                   ch_name, ch_map[0], ch_map[1], scale_fac*I, unit)
    print(msg)