diff --git a/script/jitter_scan.py b/script/jitter_scan.py
index eec4da2..873e380 100644
--- a/script/jitter_scan.py
+++ b/script/jitter_scan.py
@@ -20,34 +20,59 @@ print "Start = ", start
 print "Stop = ", stop
 print "Step = ", step
 
-# controlled variabales
-#cv_rf_phase = PV("my1", SECTION + "-RLLE-DSP:PHASE-REFERENCE")
-cv_rf_phase = PV("my1", SECTION + "-RLLE-REF10:SIG-AMPLT-JIT-P2P-REL")
-cv_rf_phase.initialize()
-val = cv_rf_phase.read()
-print "val= " , val
-#cv_rf_amplt = ChannelDouble(SECTION + "-RLLE-DSP:AMPLT-REFERENCE")
 
+# define all PVs
+# controlled variabales
+cv_rf_phase = PV("phase reference"    , SECTION + "-RLLE-DSP:PHASE-REFERENCE")
+cv_rf_amplt = PV("amplitude reference", SECTION + "-RLLE-DSP:AMPLT-REFERENCE")
 
 # measured variables
-#mv_ref_jit_amplt = ChannelDouble(SECTION + "-RLLE-REF10:SIG-AMPLT-JIT-P2P-REL")
-#mv_ref_jit_PHASE = ChannelDouble(SECTION + "-RLLE-REF10:SIG-PHASE-JIT-P2P")
+mv_ref_jit_amplt = PV("REF amplitude jitter relative",SECTION + "-RLLE-REF10:SIG-AMPLT-JIT-P2P-REL")
+mv_ref_jit_phase = PV("REF phase jitter"             ,SECTION + "-RLLE-REF10:SIG-PHASE-JIT-P2P")
 
-#mv_iqm_jit_amplt = ChannelDouble(SECTION + "-RIQM-DCP10:FOR-AMPLT-JIT-P2P-REL")
-#mv_iqm_jit_PHASE = ChannelDouble(SECTION + "-RIQM-DCP10:FOR-PHASE-JIT-P2P")
+mv_iqm_jit_amplt = PV("IQM amplitude jitter relative",SECTION + "-RIQM-DCP10:FOR-AMPLT-JIT-P2P-REL")
+mv_iqm_jit_phase = PV("IQM phase jitter"             ,SECTION + "-RIQM-DCP10:FOR-PHASE-JIT-P2P")
 
-#mv_pre_jit_amplt = ChannelDouble(SECTION + "-RPRE-DCP10:FOR-AMPLT-JIT-P2P-REL")
-#mv_pre_jit_PHASE = ChannelDouble(SECTION + "-RPRE-DCP10:FOR-PHASE-JIT-P2P")
+mv_pre_jit_amplt = PV("PRE amplitude jitter relative",SECTION + "-RPRE-DCP10:FOR-AMPLT-JIT-P2P-REL")
+mv_pre_jit_phase = PV("PRE phase jitter"             ,SECTION + "-RPRE-DCP10:FOR-PHASE-JIT-P2P")
 
-#mv_kly_jit_amplt = ChannelDouble(SECTION + "-RKLY-DCP10:FOR-AMPLT-JIT-P2P-REL")
-#mv_kly_jit_PHASE = ChannelDouble(SECTION + "-RKLY-DCP10:FOR-PHASE-JIT-P2P")
+mv_kly_jit_amplt = PV("KLY amplitude jitter relative",SECTION + "-RKLY-DCP10:FOR-AMPLT-JIT-P2P-REL")
+mv_kly_jit_phase = PV("KLY phase jitter"             ,SECTION + "-RKLY-DCP10:FOR-PHASE-JIT-P2P")
+
+
+# initialize all PVs
+cv_rf_phase.initialize()
+cv_rf_amplt.initialize()
+mv_ref_jit_amplt.initialize()
+mv_ref_jit_phase.initialize()
+mv_iqm_jit_amplt.initialize()
+mv_iqm_jit_phase.initialize()
+mv_pre_jit_amplt.initialize()
+mv_pre_jit_phase.initialize()
+mv_kly_jit_amplt.initialize()
+mv_kly_jit_phase.initialize()
 
 
 
-#r = lscan(cv_rf_phase, (mv_ref_jit_amplt,mv_ref_jit_PHASE,mv_iqm_jit_amplt,mv_iqm_jit_PHASE,mv_pre_jit_amplt,mv_pre_jit_PHASE,mv_kly_jit_amplt,mv_kly_jit_PHASE), start, stop, step , latency=latency)
+
+r = lscan(cv_rf_phase, (mv_ref_jit_amplt,mv_ref_jit_phase,mv_iqm_jit_amplt,mv_iqm_jit_phase,mv_pre_jit_amplt,mv_pre_jit_phase,mv_kly_jit_amplt,mv_kly_jit_phase), start, stop, step , latency=latency)
+
+
+
+# close all PVs
+cv_rf_phase.close()
+cv_rf_amplt.close()
+mv_ref_jit_amplt.close()
+mv_ref_jit_phase.close()
+mv_iqm_jit_amplt.close()
+mv_iqm_jit_phase.close()
+mv_pre_jit_amplt.close()
+mv_pre_jit_phase.close()
+mv_kly_jit_amplt.close()
+mv_kly_jit_phase.close()
+
+
 
 
 #elogllrf("Hallo Test", "Das ist meine Nachricht...","LLRF", "General", "SINEG01")
 
-
-