diff --git a/script/jitter_scan.py b/script/jitter_scan.py
index 2d65239..1da33fd 100644
--- a/script/jitter_scan.py
+++ b/script/jitter_scan.py
@@ -45,7 +45,7 @@ import  ch.psi.pshell.epics.ControlledVariable as PV_cv
 # controlled variabales
 #cv_rf_phase = PV("phase_ref", SECTION + "-RLLE-DSP:PHASE-REFERENCE")
 #cv_rf_amplt = PV("amplt_ref", SECTION + "-RLLE-DSP:AMPLT-REFERENCE")
-cv_rf_phase = PV_cv("phase_ref", SECTION + "-RSYS:SET-VSUM-PHASE", SECTION + "-RSYS:GET-PHASE-REACHED")
+cv_rf_phase = PV_cv("phase_ref", SECTION + "-RSYS:SET-VSUM-PHASE", SECTION + "-RLLE-DSP:FB-PHASE-M")
 cv_rf_amplt = PV_cv("amplt_ref", SECTION + "-RSYS:SET-ACC-VOLT"  , SECTION + "-RSYS:GET-AMPLT-REACHED")
 
 # measured variables