text: description = 'Chopper 2'
  
  group = 'optional'
  
  devices = dict(
      ch1_speed=device('nicos.devices.generic.virtual.VirtualMotor',
          description='Rotation speed',
          abslimits=(0, 300),
          userlimits=(0, 300),
          fmtstr='%.f',
          unit='Hz',
          speed=5,
      ),
      ch1_phase=device('nicos.devices.generic.virtual.VirtualMotor',
          description='Phase angle',
          abslimits=(-180, 180),
          userlimits=(-180, 180),
          fmtstr='%.f',
          unit='Hz',
          jitter=2,
          speed=5,
      ),
  )
  