diff --git a/src/WaferProber-Accretech_UFseries/libs/accretech_uf.py b/src/WaferProber-Accretech_UFseries/libs/accretech_uf.py
index d553ad41..8e668b27 100644
--- a/src/WaferProber-Accretech_UFseries/libs/accretech_uf.py
+++ b/src/WaferProber-Accretech_UFseries/libs/accretech_uf.py
@@ -5,7 +5,7 @@
 #
 # MIT License
 #
-# Copyright (c) 2022 SweepMe! GmbH (sweep-me.net)
+# Copyright (c) 2022-2024 SweepMe! GmbH (sweep-me.net)
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -63,7 +63,8 @@ def __init__(self, port):
                 "No connection established with Accretech UF prober. "
                 "Please check port address / instrument is connected"
             )
-        self.port.port.enable_event(self.event_type, self.event_mech)
+
+        self.register_srq_event()
 
         # not used at the moment as the default is set in acquire_status_byte()
         # self.service_request_timeout = 5  # in seconds
@@ -181,7 +182,12 @@ def __init__(self, port):
         }
 
     def __del__(self):
+        self.unregister_srq_event()
 
+    def register_srq_event(self):
+        self.port.port.enable_event(self.event_type, self.event_mech)
+
+    def unregister_srq_event(self):
         self.port.port.disable_event(self.event_type, self.event_mech)
 
     def set_verbose(self, state=True):
@@ -565,6 +571,12 @@ def request_position(self):
 
         Caution: Unit depends on system settings. Using 'Metric' unit is 1e-1 µm. Using 'English' unit is 1e-5 inch.
 
+        Attention:
+        The command 'R' was designed for 200 mm wafer and might not work with 300 mm wafer
+        In future, one could use the command ur11401 und ur11402 to read x and y position. The 'ur' command is used
+        to read parameter values. However, the coordinate system of ur11401 und ur11402 is different with respect to
+        the 'R' command
+
         Returns:
             int: x coordinate in µm
             int: y coordinate in µm
diff --git a/src/WaferProber-Accretech_UFseries/license.txt b/src/WaferProber-Accretech_UFseries/license.txt
index 4c418d32..de61d8c6 100644
--- a/src/WaferProber-Accretech_UFseries/license.txt
+++ b/src/WaferProber-Accretech_UFseries/license.txt
@@ -5,7 +5,7 @@ find those in the corresponding folders or contact the maintainer.
 
 MIT License
 
-Copyright (c) 2022 SweepMe! GmbH (sweep-me.net)
+Copyright (c) 2022-2024 SweepMe! GmbH (sweep-me.net)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/src/WaferProber-Accretech_UFseries/main.py b/src/WaferProber-Accretech_UFseries/main.py
index f1820fcf..a5113bb9 100644
--- a/src/WaferProber-Accretech_UFseries/main.py
+++ b/src/WaferProber-Accretech_UFseries/main.py
@@ -5,7 +5,7 @@
 #
 # MIT License
 #
-# Copyright (c) 2022-2023 SweepMe! GmbH (sweep-me.net)
+# Copyright (c) 2022-2024 SweepMe! GmbH (sweep-me.net)
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -49,7 +49,6 @@
 accretech_uf = imp.load_source("accretech_uf", os.path.dirname(os.path.abspath(__file__)) +
                                os.sep + r"libs\accretech_uf.py")
 
-
 # this is needed as a fallback solutions as pysweepme.UserInterface is not available for all 1.5.5 update versions
 try:
     from pysweepme.UserInterface import message_box
@@ -400,8 +399,8 @@ def apply(self):
         self.die_x, self.die_y = self.prober.request_die_coordinate()
 
         # We always get in contact if not done already
-        # if not self.prober.is_chuck_contacted():
-        #     self.prober.z_up()
+        if not self.prober.is_chuck_contacted():
+            self.prober.z_up()
 
         # Check whether dies are correct
         self.print_die_info()