diff --git a/script/jitter_scan.py b/script/jitter_scan.py
index 23527e2..14dc529 100644
--- a/script/jitter_scan.py
+++ b/script/jitter_scan.py
@@ -37,7 +37,8 @@ set_context(path = "{data}/{year}_{month}/{date}/{date}_{time}_"  + str(SECTION)
 
 #################################################################################
 # define all PVs
-import  ch.psi.pshell.epics.ProcessVariable as PV
+#import  ch.psi.pshell.epics.ProcessVariable as PV
+import  ch.psi.pshell.epics.ChannelDouble as PV
 
 # controlled variabales
 cv_rf_phase = PV("phase_ref", SECTION + "-RSYS:SET-VSUM-PHASE")