diff --git a/script/optics/ExitSlitYScanKei.py b/script/optics/ExitSlitYScanKei.py
index 9ceb13f6..128bc3e6 100644
--- a/script/optics/ExitSlitYScanKei.py
+++ b/script/optics/ExitSlitYScanKei.py
@@ -34,8 +34,10 @@ def trig():
     wait_beam()
     caput(KEI_DIODE + "DOINIT", 1)
     caput(KEI_RMU + "DOINIT", 1)
+    time.sleep(0.1)
     caput(KEI_DIODE + "DOTRIGGER", 1)
     caput(KEI_RMU + "DOTRIGGER", 1)
+    time.sleep(DWELL)
     caput(KEI_DIODE + "DOFETCH", 1)
     caput(KEI_RMU + "DOFETCH", 1)