diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index 96d0f6ecf0b02b49294cbe7429440f0e3e2776a1..9874962175618de6d26c92d9cfca69f065b89279 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -274,11 +274,13 @@ class OhmPiHardware:
 
     def _plot_readings(self):
         # Plot graphs
-        fig, ax = plt.subplots(nrows=2, sharex=True)
+        fig, ax = plt.subplots(nrows=3, sharex=True)
         ax[0].plot(self.readings[:, 0], self.readings[:, 3], '-r', marker='.', label='iab')
         ax[0].set_ylabel('Iab [mA]')
         ax[1].plot(self.readings[:, 0], self.readings[:, 2] * self.readings[:, 4], '-b', marker='.', label='vmn')
         ax[1].set_ylabel('Vmn [mV]')
+        ax[1].plot(self.readings[:, 0], self.readings[:, 1], '-g', marker='.', label='pulse')
+        ax[1].set_ylabel('Vmn [mV]')
         fig.legend()
         plt.show()