diff --git a/satpy/readers/seviri_l1b_hrit.py b/satpy/readers/seviri_l1b_hrit.py
index 15c382a54a..f08650f331 100644
--- a/satpy/readers/seviri_l1b_hrit.py
+++ b/satpy/readers/seviri_l1b_hrit.py
@@ -728,6 +728,11 @@ def pad_hrv_data(self, res):
 
     def calibrate(self, data, calibration):
         """Calibrate the data."""
+        calib = self._get_calibration_handler()
+        res = calib.calibrate(data, calibration)
+        return res
+
+    def _get_calibration_handler(self):
         calib_params = CalibParams(
             mode=self.calib_mode.upper(),
             internal_coefs=self._get_calib_coefs(),
@@ -736,9 +741,7 @@ def calibrate(self, data, calibration):
         )
         scan_params = ScanParams(self.platform_id, self.channel_name,
                                  self.observation_start_time)
-        calib = SEVIRICalibrationHandler(calib_params, scan_params)
-        res = calib.calibrate(data, calibration)
-        return res
+        return SEVIRICalibrationHandler(calib_params, scan_params)
 
     def _mask_bad_quality(self, data):
         """Mask scanlines with bad quality."""
diff --git a/satpy/readers/seviri_l1b_native.py b/satpy/readers/seviri_l1b_native.py
index 8ef97b3a78..18c6d9f711 100644
--- a/satpy/readers/seviri_l1b_native.py
+++ b/satpy/readers/seviri_l1b_native.py
@@ -623,22 +623,22 @@ def _get_hrv_channel(self):
     def calibrate(self, data, dataset_id):
         """Calibrate the data."""
         tic = dt.datetime.now()
+        calib = self._get_calibration_handler(dataset_id)
+        res = calib.calibrate(data, dataset_id["calibration"])
+        logger.debug("Calibration time " + str(dt.datetime.now() - tic))
+        return res
+
+    def _get_calibration_handler(self, dataset_id):
         channel_name = dataset_id["name"]
-        band_idx = self._get_band_index(channel_name)
-        radiance_types = self.header["15_DATA_HEADER"]["ImageDescription"][
-            "Level15ImageProduction"]["PlannedChanProcessing"]
         calib_params = CalibParams(
             mode=self.calib_mode.upper(),
             internal_coefs=self._get_calib_coefs(channel_name),
             external_coefs=self.ext_calib_coefs,
-            radiance_type=radiance_types[band_idx]
+            radiance_type=self._get_radiance_type(channel_name)
         )
         scan_params = ScanParams(self.platform_id, channel_name,
                                  self.observation_start_time)
-        calib = SEVIRICalibrationHandler(calib_params, scan_params)
-        res = calib.calibrate(data, dataset_id["calibration"])
-        logger.debug("Calibration time " + str(dt.datetime.now() - tic))
-        return res
+        return SEVIRICalibrationHandler(calib_params, scan_params)
 
     def _get_calib_coefs(self, channel_name):
         """Get coefficients for calibration from counts to radiance."""
@@ -668,6 +668,12 @@ def _get_band_index(self, channel_name):
         # hence, this channel index needs to refer to full channel list
         return list(CHANNEL_NAMES.values()).index(channel_name)
 
+    def _get_radiance_type(self, channel_name):
+        band_idx = self._get_band_index(channel_name)
+        radiance_types = self.header["15_DATA_HEADER"]["ImageDescription"][
+            "Level15ImageProduction"]["PlannedChanProcessing"]
+        return radiance_types[band_idx]
+
     def _add_scanline_acq_time(self, dataset, dataset_id):
         """Add scanline acquisition time to the given dataset."""
         if dataset_id["name"] == "HRV":
diff --git a/satpy/readers/seviri_l1b_nc.py b/satpy/readers/seviri_l1b_nc.py
index b75b2cc09d..726caf83a1 100644
--- a/satpy/readers/seviri_l1b_nc.py
+++ b/satpy/readers/seviri_l1b_nc.py
@@ -189,21 +189,26 @@ def calibrate(self, dataset, dataset_id):
         if dataset_id["calibration"] == "counts":
             dataset.attrs["_FillValue"] = 0
 
-        band_idx = list(CHANNEL_NAMES.values()).index(channel)
-        radiance_type = self.nc["planned_chan_processing"].values[band_idx]
+        calib = self._get_calibration_handler(dataset, channel)
+        return calib.calibrate(dataset, calibration)
+
+    def _get_calibration_handler(self, dataset, channel):
         calib_params = CalibParams(
             mode="NOMINAL",
             internal_coefs=self._get_calib_coefs(dataset, channel),
             external_coefs=self.ext_calib_coefs,
-            radiance_type=radiance_type
+            radiance_type=self._get_radiance_type(channel)
         )
         scan_params = ScanParams(
             int(self.platform_id),
             channel,
             self.observation_start_time
         )
-        calib = SEVIRICalibrationHandler(calib_params, scan_params)
-        return calib.calibrate(dataset, calibration)
+        return SEVIRICalibrationHandler(calib_params, scan_params)
+
+    def _get_radiance_type(self, channel):
+        band_idx = list(CHANNEL_NAMES.values()).index(channel)
+        return self.nc["planned_chan_processing"].values[band_idx]
 
     def _get_calib_coefs(self, dataset, channel):
         """Get coefficients for calibration from counts to radiance.