diff --git a/Python_script/VNA.py b/Python_script/VNA.py
index ff8729426f9d98e3e15646174d6a615746da6dde..068b9e37cccccd9f83b80844581221934cd83671 100755
--- a/Python_script/VNA.py
+++ b/Python_script/VNA.py
@@ -2,7 +2,13 @@
 
 import pyvisa
 import time
+from VNA_dummy import VnaDummy
 
+def create_VNA(hostname):
+    if hostname == 'localhost':
+        return VnaDummy(hostname)
+    else:
+        return Vna(hostname)
 
 class Vna:
     def __init__(self, ip_address):