diff --git a/gui/CAEN-N1471H/caen_simulator.py b/gui/CAEN-N1471H/caen_simulator.py
index 60997e3..4df0599 100644
--- a/gui/CAEN-N1471H/caen_simulator.py
+++ b/gui/CAEN-N1471H/caen_simulator.py
@@ -3,7 +3,7 @@
 import random
 
 
-# class that simulates the channel of the caen by giving a random value to its attriutes vmon, imon and
+# class that simulates the channel of the caen by giving a random value to its attributes vmon, imon and
 class ChannelSimulator:
     def __init__(self, trip_probability=0.02):
         # private attributes (they do not exist in the real device)
@@ -104,9 +104,9 @@ def turn_off(self):
 
 
 class ModuleSimulator:
-    def __init__(self, nChannels, trip_probability=0.05):
+    def __init__(self, n_channels, trip_probability=0.05):
         self.name = "N1471H SIMULATOR"
-        self.number_of_channels = nChannels
+        self.number_of_channels = n_channels
         self.channels = [
             ChannelSimulator(
                 1 - (1 - trip_probability) ** (1.0 / self.number_of_channels)
diff --git a/gui/CAEN-N1471H/gui.py b/gui/CAEN-N1471H/gui.py
index e76ab7c..88c8733 100644
--- a/gui/CAEN-N1471H/gui.py
+++ b/gui/CAEN-N1471H/gui.py
@@ -530,19 +530,17 @@ def update_alarm_indicators(self):
 
     args = parser.parse_args()
 
-    if args.test:
-        from caen_simulator import *
+    if not args.test:
+        caen = hvps.Caen(port=args.port)
 
-        m = ModuleSimulator(4)
+        print("port:", caen.port)
+        print("baudrate:", caen.baudrate)
 
-        CaenHVPSGUI(module=m, channel_names=CHANNEL_NAMES)
-        exit(0)
+        m = caen.module(0)
 
-    caen = hvps.Caen(port=args.port)
+    else:
+        from caen_simulator import *  # noqa: F403
 
-    print("port:", caen.port)
-    print("baudrate:", caen.baudrate)
-
-    m = caen.module(0)
+        m = ModuleSimulator(4)  # noqa: F405
 
     CaenHVPSGUI(module=m, channel_names=CHANNEL_NAMES)