diff --git a/hp4155/measurements.py b/hp4155/measurements.py
index d6b3f94d25f0b581f43c0cb54b976c13ffb451f8..3c84581510995e9d062355ae868d5c09112d22f1 100644
--- a/hp4155/measurements.py
+++ b/hp4155/measurements.py
@@ -136,6 +136,7 @@ def ctlm(field_name ='M00',start=-50*10**(-3),stop=50*10**(-3),step=10**(-3),com
     
     #connect to the device
     device = module.HP4155a('GPIB0::17::INSTR')
+    date = str(datetime.today().replace(microsecond=0))
     
     #initilize figure
     plt.figure()
@@ -209,9 +210,8 @@ def ctlm(field_name ='M00',start=-50*10**(-3),stop=50*10**(-3),step=10**(-3),com
         data = {header[0]:voltage_values,header[1]:current_values,header[2]:resisance_values}
         df = pd.DataFrame(data)
         print(df)
-        date = str(datetime.today().replace(microsecond=0))
         
-        file_name = f"{field_name}_CTLM_{j+1}.txt"
+        file_name = f"{field_name}_CTLM_{j+1}_{date}.txt"
         path = f"\\FILESERVER\public\Datentransfer\Asonitis, Alexandros\_{file_name}"
         #export DataFrame to text file (keep header row and index column)
         with open(path, 'a') as f: