diff --git a/script/scan1.py b/script/scan1.py
index 52c8792e..a976ce4c 100644
--- a/script/scan1.py
+++ b/script/scan1.py
@@ -3,10 +3,14 @@
 #scienta.lowEnergy.write(397.0)
 #scienta.highEnergy.write(403.0)
 
+formerData = scienta.data.take()
 scienta.start()
 scienta.waitReady(-1)
 
 data = scienta.data.take()
+if data==former:
+    raise "Data not updated"
+
 print data.tolist()[0]