diff --git a/frappy_psi/k2601b.py b/frappy_psi/k2601b.py
index d4dde6cb..df92219e 100644
--- a/frappy_psi/k2601b.py
+++ b/frappy_psi/k2601b.py
@@ -60,7 +60,7 @@ class SourceMeter(HasIO, Module):
     ioClass = K2601bIO
 
     def read_mode(self):
-        return float(self.communicate('print((smua.source.func+1)*smua.source.output)'))
+        return int(float(self.communicate('print((smua.source.func+1)*smua.source.output)')))
 
     def write_mode(self, value):
         assert self.communicate(SOURCECMDS[value]) == 'ok'
diff --git a/frappy_psi/ppmssim.py b/frappy_psi/ppmssim.py
index 5936e0e8..d8d9939e 100644
--- a/frappy_psi/ppmssim.py
+++ b/frappy_psi/ppmssim.py
@@ -188,7 +188,7 @@ class PpmsSim:
         else:
             self.status.pos = 5
 
-        self.st = sum(self.status[i] << (i * 4) for i in range(4))
+        self.st = sum((self.status[i] << (i * 4) for i in range(4)))
         self.r1 = self.t * 0.1
         self.i1 = self.t % 10.0
         self.r2 = 1000 / self.t