diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index 8660145880c223fc2f0c2b40c1a7b90f2896d8b1..c3c73c4899f936ae24e78dc55bdfd36dc5dd5f54 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -416,7 +416,7 @@ class OhmPiHardware:
     def _vab_pulse(self, vab, duration, sampling_rate=None, polarity=1, append=False):
         """ Gets VMN and IAB from a single voltage pulse
         """
-        self.tx.polarity = polarity
+        #self.tx.polarity = polarity
         if sampling_rate is None:
             sampling_rate = RX_CONFIG['sampling_rate']
         if self.tx.pwr.voltage_adjustable: