class_docstr: Test case for reading calibrated brightness temperature from hrpt data.
class_docstr_tok: ["Test","case","for","reading","calibrated","brightness","temperature","from","hrpt","data","."]
docstr: Get the channel 4 bt.
code: def _get_channel_3a_counts(self):
      """Get the channel 4 bt."""
      dataset_id = make_dataid(name="3a", calibration="counts")
      return self._get_dataset(dataset_id)
  
imports: import os
  import unittest
  from contextlib import suppress
  from tempfile import NamedTemporaryFile
  from unittest import mock
  import numpy
  import xarray
  from satpy.readers.hrpt import HRPTFile, dtype
  from satpy.tests.reader_tests.test_avhrr_l1b_gaclac import PygacPatcher
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 3 for calling the TestHRPTChannel3 obj's underlying member method code with example usage: obj._get_channel_3a_counts() and returns: self