diff --git a/hp4155/memristor (Version 4.1)/help.py b/hp4155/memristor (Version 4.1)/help.py
index 3941edf7cc1cac337061358e7ab0949caedde6cb..be1838ec43bf9c8852e2a0be7bd5b68b2d5d7e6d 100644
--- a/hp4155/memristor (Version 4.1)/help.py	
+++ b/hp4155/memristor (Version 4.1)/help.py	
@@ -206,7 +206,7 @@ def sweep(start,stop,step,comp,integration,device): #step cannot be negative
 
 #sampling check
 def sampling_check(voltage,device):
-    
+    device.del_user_functions()
     parameters ={
         'mode' : 'LIN',
         'hold': 0,