diff --git a/script/optics/ExitSlitYScan.py b/script/optics/ExitSlitYScan.py
index f0cd1894..10e1f6b6 100644
--- a/script/optics/ExitSlitYScan.py
+++ b/script/optics/ExitSlitYScan.py
@@ -10,9 +10,10 @@ POSITIONERS = (ExitSlitY)
 SENSORS = (SampleCurrent,RefCurrent, MachineCurrent)
 STARTPOS = (0.5)
 ENDPOS = (-0.5)
-STEPS = 1
+#STEPS = -0.01
 DWELL = 0.1
 TOTAL_TIME = 50
+STEPS = int(TOTAL_TIME / DWELL) + 1
 
 def trig():
     wait_beam()
@@ -25,4 +26,4 @@ def trig():
 #set_adc_averaging(dwelltime=DWELL)
 #set_exec_pars(compression=True, shuffle=True)
 #lscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, LATENCY, before_read=trig, after_read=after_readout)
-cscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, time=TOTAL_TIME, after_read=after_readout)
+cscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, time=TOTAL_TIME, after_read=after_readout, check_positions = False)