diff --git a/python/lsst/ts/observatory/control/base_calsys.py b/python/lsst/ts/observatory/control/base_calsys.py
index f22a5127..d293eb06 100644
--- a/python/lsst/ts/observatory/control/base_calsys.py
+++ b/python/lsst/ts/observatory/control/base_calsys.py
@@ -26,6 +26,7 @@
 import logging
 import typing
 
+import jsonschema
 import yaml
 from lsst.ts import salobj
 from lsst.ts.xml.enums.Electrometer import UnitToRead
@@ -166,19 +167,35 @@ def load_calibration_config_file(self, filename: str | None = None) -> None:
         the class name. However, it is possible to provide
         an override with the full file name.
 
+        It performs a schema validation if the configuration
+        schema file is present. The name of the schema file is
+        the class name with a "_schema" suffix and may or may
+        not be present. When the validation is performed, an
+        exception is raised if it fails.
+
         Parameters
         ----------
         filename : `str`, optional
             Alternative file name with the calibration
             configuration file.
+
+        Raises
+        ------
+        RuntimeError:
+            If configuration fails validation.
+
         """
 
+        base_name = type(self).__name__.lower()
+
         data_path = (
-            (get_data_path() / f"{type(self).__name__.lower()}.yaml").as_posix()
+            (get_data_path() / f"{base_name}.yaml").as_posix()
             if filename is None
             else filename
         )
 
+        schema_path = (get_data_path() / f"{base_name}_schema.yaml").as_posix()
+
         if len(self.calibration_config) > 0:
             self.log.warning(
                 "Calibration configuration already loaded."
@@ -188,6 +205,25 @@ def load_calibration_config_file(self, filename: str | None = None) -> None:
         with open(data_path, "r") as f:
             self.calibration_config = yaml.safe_load(f)
 
+        config_schema = None
+        try:
+            with open(schema_path, "r") as f:
+                config_schema = yaml.safe_load(f)
+        except FileNotFoundError:
+            self.log.warning(
+                f"Configuration schema file {schema_path} not found. "
+                f"No schema validation is performed for {data_path}."
+            )
+
+        if config_schema:
+            for item in self.calibration_config:
+                try:
+                    jsonschema.validate(
+                        instance=self.calibration_config[item], schema=config_schema
+                    )
+                except jsonschema.ValidationError as validation_error:
+                    raise RuntimeError(validation_error.message)
+
     def get_calibration_configuration(self, name: str) -> dict[str, typing.Any]:
         """Returns the configuration attributes given a configuration
         name.
diff --git a/python/lsst/ts/observatory/control/data/atcalsys_schema.yaml b/python/lsst/ts/observatory/control/data/atcalsys_schema.yaml
new file mode 100644
index 00000000..5215abd2
--- /dev/null
+++ b/python/lsst/ts/observatory/control/data/atcalsys_schema.yaml
@@ -0,0 +1,59 @@
+$id: https://github.com/lsst-ts/ts_observatory_control/blob/develop/python/lsst/ts/observatory/control/data/atcalsys_schema.yaml
+$schema: http://json-schema.org/draft-07/schema#
+title: Configuration file validation schema of Auxiliary Telescope Calibration System
+type: object
+properties:
+  calib_type:
+    type: string
+  use_camera:
+    type: boolean
+  atspec_filter:
+    type: string
+  atspec_grating:
+    type: string
+  wavelength:
+    type: number
+  wavelength_width:
+    type: number
+  wavelength_resolution:
+    type: number
+  monochromator_grating:
+    type: string
+  exit_slit:
+    type: number
+  entrance_slit:
+    type: number
+  electrometer_integration_time:
+    type: number
+  electrometer_mode:
+    type: string
+  electrometer_range:
+    type: number
+  use_fiberspectrograph:
+    type: boolean
+  use_electrometer:
+    type: boolean
+  exposure_times:
+    type: array
+    items:
+      type: number
+
+  electrometer_exposure_time:
+    type: number
+  fiber_spectrum_exposure_time:
+    type: number
+required:
+- calib_type
+- use_camera
+- atspec_filter
+- atspec_grating
+- wavelength
+- monochromator_grating
+- exit_slit
+- entrance_slit
+- electrometer_integration_time
+- electrometer_mode
+- electrometer_range
+- use_fiberspectrograph
+- use_electrometer
+- exposure_times