class_docstr: Reader for AVHRR L1B files created from the AAPP software.
class_docstr_tok: ["Reader","for","AVHRR","L1B","files","created","from","the","AAPP","software","."]
docstr: Calibrate active channel data only.
code: def _calibrate_active_channel_data(self, key):
      """Calibrate active channel data only."""
      if self.active_channels[key["name"]]:
          return self.calibrate(key)
      return None
  
imports: import functools
  import logging
  from datetime import datetime, timedelta
  import dask.array
  import numpy
  import xarray
  from dask import delayed
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.utils import get_chunk_size_limit
label_desc: Use image node_id 4 for calling the AVHRRAAPPL1BFile obj's underlying member method code with example usage: obj._calibrate_active_channel_data(key) and returns: None, self