diff --git a/script/Marco/power-supply.py b/script/Marco/power-supply.py
index 47eefe8..29edcdf 100644
--- a/script/Marco/power-supply.py
+++ b/script/Marco/power-supply.py
@@ -7,7 +7,7 @@ sleep(0.1)
 
 #TODO: Set the diplay names of positioners and detectors
 #ManualScan(writables, readables, start = None, end = None, steps = None, relative = False)
-scan = ManualScan(['time'], ['SetVA', 'ActualVA', 'ActualIA'] , [0.0], [50.0], [10]) #????????????????????? what does this do? what is writeables? what is readables?
+scan = ManualScan(['time'], ['SetVA', 'ActualVA', 'ActualIA'] , [0.0], [20.0], [10]) #????????????????????? what does this do? what is writeables? what is readables?
 scan.start()
 
 #Creating channels: dimension 1
@@ -60,7 +60,7 @@ SetVA.close()
 ActualVA.close()
 ActualIA.close()
 
-readable =    detector2
+readable =    scan.readables(1)
 positions =   scan.writables
 
 threshold = (min(readable) + max(readable))/2