diff --git a/eos/event_data_types.py b/eos/event_data_types.py
index ff22ffb..27c682c 100644
--- a/eos/event_data_types.py
+++ b/eos/event_data_types.py
@@ -39,7 +39,7 @@ EVENT_TYPE = np.dtype([('tof', np.float64), ('pixelID', np.uint32), ('mask', np.
 PACKET_TYPE = np.dtype([('start_index', np.uint32), ('time', np.int64)])
 PULSE_TYPE = np.dtype([('time', np.int64), ('monitor', np.float32)])
 PC_TYPE = np.dtype([('current', np.float32), ('time', np.int64)])
-BM_TYPE = np.dtype([('value', np.int64), ('time', np.int64)])
+BM_TYPE = np.dtype([('value', np.int32), ('time', np.int64)])
 LOG_TYPE = np.dtype([('value', np.float32), ('time', np.int64)])
 
 # define the bitmask for individual event filters
diff --git a/eos/file_reader.py b/eos/file_reader.py
index 4a30ad8..7826671 100644
--- a/eos/file_reader.py
+++ b/eos/file_reader.py
@@ -509,7 +509,7 @@ class AmorEventData(AmorHeader):
                 self.instrument_settings.polarization = fileio.Polarization(const.polarizationConfigs[value])
             elif key in sample_keys:
                 param = key.split('_', 1)[1]
-                self.sample.sample_parameters[param].magnitue = value
+                self.sample.sample_parameters[param].magnitude = value
 
 
     def read_chopper_trigger_stream(self, packets):
diff --git a/tests/test_event_handling.py b/tests/test_event_handling.py
index e81c778..f9e8f63 100644
--- a/tests/test_event_handling.py
+++ b/tests/test_event_handling.py
@@ -101,9 +101,9 @@ class MockEventData:
             if key == 'polarization_config_label':
                 self.instrument_settings.polarization = Polarization(const.polarizationConfigs[value])
             elif key == 'sample_temperature':
-                self.sample.sample_parameters['temperature'].magnitue = value
+                self.sample.sample_parameters['temperature'].magnitude = value
             elif key == 'sample_magnetic_field':
-                self.sample.sample_parameters['magnetic_field'].magnitue = value
+                self.sample.sample_parameters['magnetic_field'].magnitude = value
 
 
 class TestActionClass(TestCase):