diff --git a/bapsflib/_hdf/maps/digitizers/sis3301.py b/bapsflib/_hdf/maps/digitizers/sis3301.py
index 65608c5..f86980c 100644
--- a/bapsflib/_hdf/maps/digitizers/sis3301.py
+++ b/bapsflib/_hdf/maps/digitizers/sis3301.py
@@ -143,10 +143,22 @@ class HDFMapDigiSIS3301(HDFMapDigiTemplate):
 
             # add 'sample average (hardware)' to dict
             splave = None
+            avestr = ''
+            find_splave = False
             if 'Samples to average' in config_group.attrs:
                 avestr = config_group.attrs['Samples to average']
                 avestr = avestr.decode('utf-8')
+                find_splave = True
+            elif 'Unnamed' in config_group.attrs:
+                avestr = config_group.attrs['Unnamed']
+                try:
+                    avestr = avestr.decode('utf-8')
+                    find_splave = True
+                except AttributeError:
+                    avestr = ''
+                    find_splave = False
 
+            if find_splave:
                 if avestr != 'No averaging':
                     _match = re.fullmatch(
                         r'(\bAverage\s)(?P<NAME>.+)(\sSamples\b)',
@@ -225,7 +237,7 @@ class HDFMapDigiSIS3301(HDFMapDigiTemplate):
         new_conns = []
 
         # review connections
-        for conn in conns:
+        for iconn, conn in enumerate(conns):
             brd = conn[0]
             chs = conn[1]
 
@@ -339,16 +351,22 @@ class HDFMapDigiSIS3301(HDFMapDigiTemplate):
 
                 # should have fields (specifically the shotnum field)
                 if sn_field not in hdset.dtype.names:
-                    why = (
-                        "HDF5 structure unexpected..."
-                        + "dataset '{}'".format(hdset_name)
-                        + " does NOT have expected shot number field "
-                        + "'{}'".format(sn_field)
-                        + "...not adding to `configs` dict"
-                    )
-                    warn(why)
-                    chs_to_remove.append(ch)
-                    continue
+                    if 'Shot number' in hdset.dtype.names \
+                            and iconn == 0:
+                        sn_field = 'Shot number'
+                        self.configs[config_name][
+                            'shotnum']['dset field'] = ('Shot number',)
+                    else:
+                        why = (
+                            "HDF5 structure unexpected..."
+                            + "dataset '{}'".format(hdset_name)
+                            + " does NOT have expected shot number "
+                            + "field '{}'".format(sn_field)
+                            + "...not adding to `configs` dict"
+                        )
+                        warn(why)
+                        chs_to_remove.append(ch)
+                        continue
 
                 # shot number has incorrect shape and type
                 if hdset.dtype[sn_field].shape != () \
@@ -432,6 +450,16 @@ class HDFMapDigiSIS3301(HDFMapDigiTemplate):
                     self._find_active_adcs(self.group[name])
 
                 # define 'shotnum' entry
+                #
+                # Note:
+                #   The original dataset shot number field was named
+                #   'Shot'.  At some point (mid- to late- 00's) this
+                #   field was renamed to 'Shot number'.
+                #
+                #   When the header dataset is reviewed by
+                #   `_adc_info_second_pass()` the field name will be
+                #   changed when appropriate.
+                #
                 self._configs[config_name]['shotnum'] = {
                     'dset field': ('Shot',),
                     'shape': (),

On the SmPD, the 'SIS 3301' digitizer labels the shot number field as 'Shot number' instead of 'Shot'
Traditionally, the `'SIS 3301'` digitizer header datasets label the shot number field as `'Shot'`.  At some point this field was re-labeled as `'Shot number'`.

This is evident in the HDF5 files generated by the SmPD, but I do not know when this change occurred or if it occurred while the `'SIS 3301'` was still being used on the LaPD.
diff --git a/bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py b/bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py
index f838951..ca02596 100644
--- a/bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py
+++ b/bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py
@@ -15,6 +15,7 @@ import numpy as np
 import unittest as ut
 
 from bapsflib.utils.errors import HDFMappingError
+from numpy.lib import recfunctions as rfn
 from unittest import mock
 
 from .common import DigitizerTestCase
@@ -817,6 +818,15 @@ class TestSIS3301(DigitizerTestCase):
         """
         Test misc behavior the does not fit into other test methods.
         """
+        # What's tested...
+        #   1. Behavior of digitizer configuration group attribute
+        #      `Shots to average`
+        #   2. Behavior of digitizer configuration group attribute
+        #      `Samples to average`
+        #      - including when attribute is named 'Unnamed' instead
+        #   4. Identifying header datasets with shot number field name
+        #      of 'Shot number'
+        #
         # setup
         config_name = 'config01'
         adc = 'SIS 3301'
@@ -904,6 +914,45 @@ class TestSIS3301(DigitizerTestCase):
         for conn in _map.configs[config_name][adc]:
             self.assertEqual(conn[2]['sample average (hardware)'], 5)
 
+        # 'Samples to average' is named 'Unnamed' instead, and valid
+        # (as seen on some SmPD HDF5 files)
+        del self.dgroup[config_path].attrs['Samples to average']
+        self.dgroup[config_path].attrs['Unnamed'] = \
+            np.bytes_('Average 2 Samples'.format(val))
+        _map = self.map
+        for conn in _map.configs[config_name][adc]:
+            self.assertEqual(conn[2]['sample average (hardware)'], 2)
+
+        # 'Samples to average' is named 'Unnamed' instead, and is NOT a
+        # byte string (as seen on some SmPD HDF5 files)
+        self.dgroup[config_path].attrs['Unnamed'] = 5
+        _map = self.map
+        for conn in _map.configs[config_name][adc]:
+            self.assertIsNone(conn[2]['sample average (hardware)'])
+        del self.dgroup[config_path].attrs['Unnamed']
+
+        # restore original value
+        self.dgroup[config_path].attrs['Samples to average'] = sp2a
+
+        # -- header dataset with 'Shot number' field                ----
+        # rename field for all board-channel connections
+        for conn in my_bcs:
+            brd = conn[0]
+            for ch in conn[1]:
+                dset_name = "{0} [{1}:{2}]".format(config_name, brd, ch)
+                hdset_name = dset_name + ' headers'
+                hdset = self.dgroup[hdset_name][...]
+                hdset = rfn.rename_fields(hdset, {'Shot': 'Shot number'})
+                del self.dgroup[hdset_name]
+                self.dgroup.create_dataset(hdset_name, data=hdset)
+
+        _map = self.map
+        self.assertEqual(
+            _map.configs[config_name]['shotnum']['dset field'],
+            ('Shot number',))
+
+        # Note: module has NOT been reset to defaults at this point
+
     def test_parse_config_name(self):
         """Test HDFMapDigiSIS3301 method `_parse_config_name`."""
         _map = self.map  # type: HDFMapDigiSIS3301

pip install -e .
parse_log_pytest
requirements.txt
pytest
3.7
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
alabaster==0.7.13
astropy==4.3.1
Babel==2.14.0
-e git+https://github.com/BaPSF/bapsflib.git@c3d90ff2393aabd3dddaedb85c9b23bc5397333b#egg=bapsflib
certifi @ file:///croot/certifi_1671487769961/work/certifi
charset-normalizer==3.4.1
codecov==2.1.13
coverage==7.2.7
docutils==0.19
exceptiongroup==1.2.2
h5py==3.8.0
idna==3.10
imagesize==1.4.1
importlib-metadata==6.7.0
iniconfig==2.0.0
Jinja2==3.1.6
MarkupSafe==2.1.5
numpy==1.21.6
packaging==24.0
pluggy==1.2.0
pyerfa==2.0.0.3
Pygments==2.17.2
pytest==7.4.4
pytz==2025.2
requests==2.31.0
scipy==1.7.3
snowballstemmer==2.2.0
Sphinx==5.3.0
sphinx-rtd-theme==2.0.0
sphinxcontrib-applehelp==1.0.2
sphinxcontrib-devhelp==1.0.2
sphinxcontrib-htmlhelp==2.0.0
sphinxcontrib-jquery==4.1
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.3
sphinxcontrib-serializinghtml==1.1.5
tomli==2.0.1
typing_extensions==4.7.1
urllib3==2.0.7
zipp==3.15.0

name: bapsflib
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2022.12.7=py37h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=22.3.1=py37h06a4308_0
  - python=3.7.16=h7a1cb2a_0
  - readline=8.2=h5eee18b_0
  - setuptools=65.6.3=py37h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.38.4=py37h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - alabaster==0.7.13
      - astropy==4.3.1
      - babel==2.14.0
      - charset-normalizer==3.4.1
      - codecov==2.1.13
      - coverage==7.2.7
      - docutils==0.19
      - exceptiongroup==1.2.2
      - h5py==3.8.0
      - idna==3.10
      - imagesize==1.4.1
      - importlib-metadata==6.7.0
      - iniconfig==2.0.0
      - jinja2==3.1.6
      - markupsafe==2.1.5
      - numpy==1.21.6
      - packaging==24.0
      - pluggy==1.2.0
      - pyerfa==2.0.0.3
      - pygments==2.17.2
      - pytest==7.4.4
      - pytz==2025.2
      - requests==2.31.0
      - scipy==1.7.3
      - snowballstemmer==2.2.0
      - sphinx==5.3.0
      - sphinx-rtd-theme==2.0.0
      - sphinxcontrib-applehelp==1.0.2
      - sphinxcontrib-devhelp==1.0.2
      - sphinxcontrib-htmlhelp==2.0.0
      - sphinxcontrib-jquery==4.1
      - sphinxcontrib-jsmath==1.0.1
      - sphinxcontrib-qthelp==1.0.3
      - sphinxcontrib-serializinghtml==1.1.5
      - tomli==2.0.1
      - typing-extensions==4.7.1
      - urllib3==2.0.7
      - zipp==3.15.0
prefix: /opt/conda/envs/bapsflib

bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_misc
bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_map_warnings
bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_construct_dataset_name bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_construct_header_dataset_name bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_map_basics bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_map_failures bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_mappings bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_not_h5py_group bapsflib/_hdf/maps/digitizers/tests/test_sis3301.py::TestSIS3301::test_parse_config_name
bapsflib/_hdf/maps/digitizers/sis3301.py
bapsflib/_hdf/maps/digitizers/sis3301.py