class_docstr: File handler for NC seviri files.
  
  **Calibration**
  
  See :mod:`satpy.readers.seviri_base`. Note that there is only one set of
  calibration coefficients available in the netCDF files and therefore there
  is no `calib_mode` argument.
  
  **Metadata**
  
  See :mod:`satpy.readers.seviri_base`.
code: def _add_scanline_acq_time(self, dataset, dataset_id):
      if dataset_id["name"] == "HRV":
          # TODO: Enable once HRV reading has been fixed.
          return
          # days, msecs = self._get_acq_time_hrv()
      else:
          days, msecs = self._get_acq_time_visir(dataset_id)
      acq_time = get_cds_time(days.values, msecs.values)
      add_scanline_acq_time(dataset, acq_time)
  
imports: import datetime
  import logging
  from datetime import timedelta
  import numpy
  from satpy._compat import cached_property
  from satpy.readers._geos_area import get_area_definition, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode
  from satpy.readers.file_handlers import BaseFileHandler, open_dataset
  from satpy.readers.seviri_base import CHANNEL_NAMES, SATNUM, NoValidOrbitParams, OrbitPolynomialFinder, SEVIRICalibrationHandler, add_scanline_acq_time, get_cds_time, get_satpos, mask_bad_quality, round_nom_time
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 18 for calling the NCSEVIRIFileHandler obj's underlying member method code with example usage: obj._add_scanline_acq_time(dataset, dataset_id) without return types