diff --git a/script/KeithleyVoltageScan.py b/script/KeithleyVoltageScan.py
index 4c51f44a..9d41215a 100644
--- a/script/KeithleyVoltageScan.py
+++ b/script/KeithleyVoltageScan.py
@@ -5,7 +5,7 @@ Keithley voltage scan
 
 POSITIONERS = (Keithley2Voltage)
 SENSORS = (Counts, SampleCurrent, RefCurrent, MachineCurrent, EnergyDistribution, AngleDistribution, Scienta.dataMatrix)
-POSITIONS = (13,15)
+POSITIONS = (-50,50)
 STEPS = 4
 LATENCY = 1.0