frappy_psi: two small fixes in k2601b/ppmssim

Change-Id: I5b3a333fd6e79d1f09d540726ce0a91580c63d08
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30983
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

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'