diff --git a/dstat-interface/dstat_comm.py b/dstat-interface/dstat_comm.py
index 9e7abf1022bb231e2abff7a6a73dfa70e1267c6e..fab46b668b728a22e8a735cba4989b830960df3f 100644
--- a/dstat-interface/dstat_comm.py
+++ b/dstat-interface/dstat_comm.py
@@ -253,6 +253,28 @@ class Chronoamp(Experiment):
         return (scan,
                 [seconds+milliseconds/1000., current*(1.5/self.gain/8388607)])
 
+class PDExp(Chronoamp):
+    """Photodiode/PMT experiment"""
+    def __init__(self, parameters, main_pipe):
+        super(Chronoamp, self).__init__(parameters, main_pipe) # Don't want to call CA's init
+
+        self.datatype = "linearData"
+        self.xlabel = "Time (s)"
+        self.ylabel = "Current (A)"
+        self.data = [[], []]
+        self.datalength = 2
+        self.databytes = 8
+        self.xmin = 0
+        self.xmax = self.parameters['time']
+        
+        self.commands += "R"
+        self.commands[2] += "1"
+        self.commands[2] += " "
+        self.commands[2] += str(int(65536-self.parameters['voltage']*(65536./3000)))
+        self.commands[2] += " "
+        self.commands[2] += str(self.parameters['time'])
+        self.commands[2] += " "
+
 class PotExp(Experiment):
     """Potentiometry experiment"""
     def __init__(self, parameters, main_pipe):
diff --git a/dstat-interface/interface/exp_int.py b/dstat-interface/interface/exp_int.py
index 2e67a1ee6c9d3bed9272ce06b78d5ee4c9d97963..7b75ee6a2195c76bed70327c3c40621adc53eee6 100644
--- a/dstat-interface/interface/exp_int.py
+++ b/dstat-interface/interface/exp_int.py
@@ -200,9 +200,17 @@ class PD(ExpInterface):
         """Adds entry listings to superclass's self.entry dict"""
         super(PD, self).__init__('interface/pd.glade')
         
-        self.entry['voltage'] = self.builder.get_object('voltage_entry')
+        self.entry['voltage'] = self.builder.get_object('voltage_adjustment')
         self.entry['time'] = self.builder.get_object('time_entry')
         
+    def get_params(self):
+        """Returns a dict of parameters for experiment."""
+        parameters = {}    
+        parameters['voltage'] = int(self.entry['voltage'].get_value())
+        parameters['time'] = int(self.entry['time'].get_text())
+            
+        return parameters
+        
 class POT(ExpInterface):
     """Experiment class for Potentiometry."""
     def __init__(self):
diff --git a/dstat-interface/interface/pd.glade b/dstat-interface/interface/pd.glade
index a9e34be9cf87887bf799313f66c17c33d7967b26..5e87db990c80a655d1f07b792fb62816518918ef 100644
--- a/dstat-interface/interface/pd.glade
+++ b/dstat-interface/interface/pd.glade
@@ -2,6 +2,11 @@
 <interface>
   <requires lib="gtk+" version="2.24"/>
   <!-- interface-naming-policy project-wide -->
+  <object class="GtkAdjustment" id="voltage_adjustment">
+    <property name="upper">3000</property>
+    <property name="step_increment">1</property>
+    <property name="page_increment">10</property>
+  </object>
   <object class="GtkWindow" id="window1">
     <property name="can_focus">False</property>
     <child>
@@ -26,28 +31,6 @@
                     <property name="n_rows">2</property>
                     <property name="n_columns">2</property>
                     <property name="homogeneous">True</property>
-                    <child>
-                      <object class="GtkEntry" id="voltage_entry">
-                        <property name="visible">True</property>
-                        <property name="can_focus">True</property>
-                        <property name="invisible_char">●</property>
-                        <property name="width_chars">8</property>
-                        <property name="text" translatable="yes">0</property>
-                        <property name="xalign">1</property>
-                        <property name="invisible_char_set">True</property>
-                        <property name="primary_icon_activatable">False</property>
-                        <property name="secondary_icon_activatable">False</property>
-                        <property name="primary_icon_sensitive">True</property>
-                        <property name="secondary_icon_sensitive">True</property>
-                      </object>
-                      <packing>
-                        <property name="left_attach">1</property>
-                        <property name="right_attach">2</property>
-                        <property name="x_options"/>
-                        <property name="y_options">GTK_FILL</property>
-                        <property name="y_padding">3</property>
-                      </packing>
-                    </child>
                     <child>
                       <object class="GtkEntry" id="time_entry">
                         <property name="visible">True</property>
@@ -94,6 +77,21 @@
                         <property name="y_options">GTK_FILL</property>
                       </packing>
                     </child>
+                    <child>
+                      <object class="GtkHScale" id="voltage_scale">
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="adjustment">voltage_adjustment</property>
+                        <property name="restrict_to_fill_level">False</property>
+                        <property name="fill_level">100</property>
+                        <property name="round_digits">1</property>
+                        <property name="digits">0</property>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="right_attach">2</property>
+                      </packing>
+                    </child>
                   </object>
                   <packing>
                     <property name="expand">False</property>
@@ -107,7 +105,6 @@
                     <property name="can_focus">False</property>
                     <property name="xpad">20</property>
                     <property name="ypad">20</property>
-                    <property name="label" translatable="yes">Experiment not yet implemented</property>
                     <attributes>
                       <attribute name="weight" value="bold"/>
                     </attributes>
@@ -118,6 +115,9 @@
                     <property name="position">1</property>
                   </packing>
                 </child>
+                <child>
+                  <placeholder/>
+                </child>
               </object>
             </child>
           </object>
diff --git a/dstat-interface/main.py b/dstat-interface/main.py
index 49aa8e79eb58cf973dc07a10fae6bba1663b4560..0bf67c7855d8db993c6f924466e42bd4ac608f92 100755
--- a/dstat-interface/main.py
+++ b/dstat-interface/main.py
@@ -503,6 +503,34 @@ class Main(object):
                                                    self.experiment_running_plot)
                 gobject.idle_add(self.experiment_running)
                 return
+                
+            elif selection == 6:  # PD                    
+                parameters.update(self.exp_window.get_params('pde'))
+                
+                if (parameters['time'] <= 0):
+                    raise InputError(parameters['clean_s'],
+                                     "Time must be greater than zero.")
+                if (parameters['time'] > 65535):
+                    raise InputError(parameters['clean_s'],
+                                     "Time must fit in 16-bit counter.")
+                
+                self.recv_p, self.send_p = multiprocessing.Pipe(duplex=True)
+                self.current_exp = comm.PDExp(parameters, self.send_p)
+                
+                self.plot.clearall()
+                self.plot.changetype(self.current_exp)
+
+                self.current_exp.run_wrapper(
+                    self.serial_liststore.get_value(
+                        self.serial_combobox.get_active_iter(), 0))
+
+                self.send_p.close()
+
+                self.plot_proc = gobject.timeout_add(200,
+                                                   self.experiment_running_plot)
+                gobject.idle_add(self.experiment_running)
+                return
+                            
             elif selection == 7:  # POT
                 if not (self.version[0] >= 1 and self.version[1] >= 2):
                     self.statusbar.push(self.error_context_id, 
@@ -535,6 +563,7 @@ class Main(object):
                                                    self.experiment_running_plot)
                 gobject.idle_add(self.experiment_running)
                 return
+                
             else:
                 self.statusbar.push(self.error_context_id, 
                                     "Experiment not yet implemented.")