diff --git a/esbo_etc/classes/Config.py b/esbo_etc/classes/Config.py
index 3df5182..adca288 100644
--- a/esbo_etc/classes/Config.py
+++ b/esbo_etc/classes/Config.py
@@ -139,6 +139,14 @@ class Configuration(object):
             mes is not None and error("Configuration check: common -> jitter_sigma: " + mes)
         if not hasattr(self.conf.common, "output_path"):
             setattr(self.conf.common, "output_path", Entry(val="."))
+        if hasattr(self.conf.common, "exposure_time"):
+            mes = self.conf.common.exposure_time.check_quantity("val", u.s)
+            mes is not None and error("Configuration check: common -> exposure_time: " + mes)
+        elif hasattr(self.conf.common, "snr"):
+            mes = self.conf.common.snr.check_quantity("val", u.dimensionless_unscaled)
+            mes is not None and error("Configuration check: common -> snr: " + mes)
+        else:
+            error("Configuration check: common: Expected one of the containers 'exposure_time' or 'snr' but got none.")
 
         # Check astroscene
         if not hasattr(self.conf, "astroscene"):
diff --git a/esbo_etc/esbo-etc.py b/esbo_etc/esbo-etc.py
index 1729759..2a58942 100644
--- a/esbo_etc/esbo-etc.py
+++ b/esbo_etc/esbo-etc.py
@@ -3,7 +3,6 @@ import argparse
 import logging
 import sys
 
-
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(prog="esbo_etc/esbo-etc.py", description='Exposure time calculator for ESBO-DS')
     parser.add_argument("-c", "--config", dest='config', default="esbo-etc_defaults.xml",
@@ -15,10 +14,18 @@ if __name__ == "__main__":
                         help="show version information")
     args, _ = parser.parse_known_args()  # fix for PyCharm python console
 
-    logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.WARNING if args.logging is None else
-                        getattr(logging, args.logging.upper()), stream=sys.stdout)
+    logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.WARNING if args.logging is None else getattr(
+        logging, args.logging.upper()), stream=sys.stdout)
 
     conf = etc.Configuration(args.config).conf
 
-    factory = etc.classes.RadiantFactory(conf.common.wl_bins())
-    parent = factory.fromConfig(conf)
+    oc_factory = etc.classes.RadiantFactory(conf.common.wl_bins())
+    parent = oc_factory.fromConfigBatch(conf)
+    sensor_factory = etc.SensorFactory(parent, conf.common)
+    imager = sensor_factory.create(conf.instrument.sensor)
+    if hasattr(conf.common, "exposure_time"):
+        snr = imager.getSNR(conf.common.exposure_time())
+        print("The SNR is: %.2f" % snr)
+    elif hasattr(conf.common, "snr"):
+        exp_time = imager.getExpTime(conf.common.snr())
+        print("The necessary exposure time is: %.2f s" % exp_time.value)