diff --git a/script/keithley.py b/script/keithley.py
index 1811c144..2690fe1f 100644
--- a/script/keithley.py
+++ b/script/keithley.py
@@ -91,7 +91,7 @@ class Keithley(object):
         if navg > 100:
             nplc *= 2
             navg /= 2
-        navg = min(navg, 100)
+        navg = min(navg, 100.)
         nplc = min(nplc, 10.)
         
         self.nplcCh.write(nplc)
@@ -140,7 +140,7 @@ class Keithley(object):
         0.1 s dwell time, 1 s poll interval.
         """
         self.nplcCh.write(5.)
-        self.navgCh.write(1)
+        self.navgCh.write(1.)
         self.scanCh.write(6)
         self.ttypeCh.write(0)