Updates switch_mux

ohmpi/ohmpi.py

@@ -823,7 +823,7 @@ class OhmPi(object):
             self.exec_logger.debug(f'tx pwr voltage: {self._hw.tx.pwr.voltage}, rx max voltage: {self._hw.rx._voltage_max}')
             return False
         else:
-            if quadrupole == [0, 0, 0, 0]:  # NOTE: No mux
+            if np.array(quadrupole).all() == np.array([0, 0, 0, 0]).all():  # NOTE: No mux
                 return True
             else:
                 return self._hw.switch_mux(electrodes=quadrupole, state='on', bypass_check=bypass_check)