diff --git a/script/test/TestWaveform.py b/script/test/TestWaveform.py
index 437f0377..63e97b7c 100644
--- a/script/test/TestWaveform.py
+++ b/script/test/TestWaveform.py
@@ -1,5 +1,7 @@
 import ch.psi.pshell.epics.ChannelDoubleArray as ChannelDoubleArray
 
+c=ChannelDoubleArray("test", "X03DA-SCIENTA:image1:ArrayData", 3, 100, True)
+c.monitored=True
+add_device(c, True)
 
-add_device(ChannelDoubleArray("test", "X03DA-SCIENTA:image1:ArrayData", False))
-
+print len(test.read())
\ No newline at end of file