diff --git a/Source/Program/Actions/UutPowerAction.cs b/Source/Program/Actions/UutPowerAction.cs
index c4057cf..bf39aca 100644
--- a/Source/Program/Actions/UutPowerAction.cs
+++ b/Source/Program/Actions/UutPowerAction.cs
@@ -119,6 +119,8 @@ namespace ProgramLib
 
                   if (_sttoSuccess)
                   {
+                     Program.Instance()._powerSupplySharedData.ResetAll();
+
                      ProgramLib.Program.Instance().GetGuiManager()[ProgramGuiManager.WINDOWS.IMPEDANCE_CHECK].Dispatcher.Invoke((Action)delegate
                      {
                         ProgramLib.Program.Instance().GetGuiManager()[ProgramGuiManager.WINDOWS.MAIN].Show();
diff --git a/Source/Program/DataDef/PowerSupplyData.cs b/Source/Program/DataDef/PowerSupplyData.cs
new file mode 100644
index 0000000..9b33e1e
--- /dev/null
+++ b/Source/Program/DataDef/PowerSupplyData.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProgramLib
+{ 
+   /// <summary>
+   /// Stores voltage and current reading
+   /// </summary>
+   internal class PowerSupplyData
+   {
+      public double _voltage;
+      public double _current;
+      public Raytheon.Instruments.PowerSupplies.PowerSupplyModuleInfo _powerSupplyModuleInfo;
+      public bool _initialized;
+
+      /// <summary>
+      /// Set data to unitialized
+      /// </summary>
+      public void Reset()
+      {
+         _initialized = false;
+      }
+   }
+}
diff --git a/Source/Program/DataDef/PowerSupplySharedData.cs b/Source/Program/DataDef/PowerSupplySharedData.cs
new file mode 100644
index 0000000..a77cd50
--- /dev/null
+++ b/Source/Program/DataDef/PowerSupplySharedData.cs
@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProgramLib
+{
+   /// <summary>
+   /// Stores voltage and current reading for each power module
+   /// </summary>
+   internal class PowerSupplySharedData
+   {
+      private object syncObj = new object();
+      private Dictionary<string,object> syncObjDict = new Dictionary<string, object>();
+      private Dictionary<string, PowerSupplyData> _powerSupplyDataDict = new Dictionary<string, PowerSupplyData>();
+
+      /// <summary>
+      /// Set data for a power supply module
+      /// </summary>
+      public void SetData(string moduleName, double voltage, double current, Raytheon.Instruments.PowerSupplies.PowerSupplyModuleInfo powerSupplyModuleInfo)
+      {
+         lock (syncObj)
+         {
+            if (!syncObjDict.ContainsKey(moduleName))
+            {
+               // create a mutex for each module
+               syncObjDict[moduleName] = new object();
+            }
+         }
+         
+         lock (syncObjDict[moduleName])
+         {
+            if (!_powerSupplyDataDict.ContainsKey(moduleName))
+            {
+               _powerSupplyDataDict[moduleName] = new PowerSupplyData();
+            }
+
+            _powerSupplyDataDict[moduleName]._voltage = voltage;
+            _powerSupplyDataDict[moduleName]._current = current;
+            _powerSupplyDataDict[moduleName]._initialized = true;
+            _powerSupplyDataDict[moduleName]._powerSupplyModuleInfo = powerSupplyModuleInfo;
+         }
+      }
+
+      /// <summary>
+      /// Get data for a power supply module
+      /// </summary>
+      public PowerSupplyData GetData(string moduleName)
+      {
+         lock (syncObj)
+         {
+            if (!syncObjDict.ContainsKey(moduleName))
+            {
+               // create a mutex for each module
+               syncObjDict[moduleName] = new object();
+            }
+         }
+
+         lock (syncObjDict[moduleName])
+         {
+            if (!_powerSupplyDataDict.ContainsKey(moduleName))
+            {
+               throw new Exception($"{moduleName} is invalid");
+            }
+
+            return _powerSupplyDataDict[moduleName];
+         }
+      }
+
+      /// <summary>
+      /// Set each power supply data to uninialized
+      /// </summary>
+      public void ResetAll()
+      {
+         foreach (KeyValuePair<string, PowerSupplyData> entry in _powerSupplyDataDict)
+         {
+            lock (syncObj)
+            {
+               if (!syncObjDict.ContainsKey(entry.Key))
+               {
+                  // create a mutex for each module
+                  syncObjDict[entry.Key] = new object();
+               }
+            }
+
+            lock (syncObjDict[entry.Key])
+            {
+               entry.Value.Reset();
+            }
+         }
+      }
+   }
+}
diff --git a/Source/Program/Program.Actions.cs b/Source/Program/Program.Actions.cs
index 1fcb828..0e1728e 100644
--- a/Source/Program/Program.Actions.cs
+++ b/Source/Program/Program.Actions.cs
@@ -26,8 +26,14 @@ using System.Threading.Tasks;
 
 namespace ProgramLib
 {
+   /// <summary>
+   /// Methods to call into actions
+   /// </summary>
    public partial class Program
    {
+      /// <summary>
+      /// Power on UUT
+      /// </summary>
       public void UutPowerOn()
       {
          try
@@ -49,6 +55,9 @@ namespace ProgramLib
          }
       }
 
+      /// <summary>
+      /// Power off UUT
+      /// </summary>
       public void UutPowerOff()
       {
          try
diff --git a/Source/Program/Program.MeasurementManager.cs b/Source/Program/Program.MeasurementManager.cs
index be05777..21d5f17 100644
--- a/Source/Program/Program.MeasurementManager.cs
+++ b/Source/Program/Program.MeasurementManager.cs
@@ -41,6 +41,9 @@ namespace ProgramLib
       private PowerSupplyMeasurementManager _psManager = null;
       private ProgramGuiManager _guiManager = null;
 
+      internal bool _isUutPwrOn = false;
+      internal PowerSupplySharedData _powerSupplySharedData = new PowerSupplySharedData();
+
       /// <summary>
 		/// Initialize power supply measurement manager
 		/// </summary>
@@ -112,7 +115,7 @@ namespace ProgramLib
                _threadList.Add(new PassthroughDataGuiUpdateThread());
                _threadList.Last().Start();
 
-               _threadList.Add(new PowerSupplyGuiUpdateThread());
+               _threadList.Add(new PowerSupplyUpdateThread());
                _threadList.Last().Start();
             }
          }
diff --git a/Source/Program/Program.cs b/Source/Program/Program.cs
index 0888324..a46cfe6 100644
--- a/Source/Program/Program.cs
+++ b/Source/Program/Program.cs
@@ -65,7 +65,6 @@ namespace ProgramLib
       internal EventManager _eventManager = new EventManager();
       internal FileAndFolderManager _fileAndFolderManager;
       internal IConfigurationFile _programConfig { get; private set; }
-      internal bool _isUutPwrOn = false;
 
       /// <summary>
 		/// Create an instance of this class. Only one instance is allowed
diff --git a/Source/Program/Threads/PassthroughDataGuiUpdateThread.cs b/Source/Program/Threads/PassthroughDataGuiUpdateThread.cs
index aeac74f..fdd7bba 100644
--- a/Source/Program/Threads/PassthroughDataGuiUpdateThread.cs
+++ b/Source/Program/Threads/PassthroughDataGuiUpdateThread.cs
@@ -137,6 +137,7 @@ namespace ProgramLib
                if (id == Events.EVENT_TIMED_OUT)
                {
                   rnd = new Random();
+                  _mainWindow._mainWindowViewModel.UutPowerLedImagePath = _mainWindow._mainWindowViewModel._imageToResourcePathDict[MainWindowViewModel.Images.LED_OFF];
 
                   float num = 70.0f + GenerateRandomFraction();
                   _passthroughData.SetValue(PassthroughData.Variables.VAR1, num.ToString("0.00"));
@@ -151,6 +152,7 @@ namespace ProgramLib
                   num = 50.0f + GenerateRandomFraction();
                   _passthroughData.SetValue(PassthroughData.Variables.VAR4, num.ToString("0.00"));
                   Thread.Sleep(100);
+                  _mainWindow._mainWindowViewModel.UutPowerLedImagePath = _mainWindow._mainWindowViewModel._imageToResourcePathDict[MainWindowViewModel.Images.LED_ON];
                   num = 60.0f + GenerateRandomFraction();
                   _passthroughData.SetValue(PassthroughData.Variables.VAR5, num.ToString("0.00"));
                   Thread.Sleep(200);
diff --git a/Source/Program/Threads/PowerSupplyReadThread.cs b/Source/Program/Threads/PowerSupplyReadThread.cs
index 2d686d2..8b149eb 100644
--- a/Source/Program/Threads/PowerSupplyReadThread.cs
+++ b/Source/Program/Threads/PowerSupplyReadThread.cs
@@ -151,6 +151,8 @@ namespace ProgramLib
 
                         if (IsVoltageWithinLimits(moduleName, voltage))
                            break;
+
+                        Program.Instance()._powerSupplySharedData.SetData(moduleName, voltage, current, _powerSupplyModuleInfoDict[moduleName]);
                      }
                      else
                      {
diff --git a/Source/Program/Threads/PowerSupplyGuiUpdateThread.cs b/Source/Program/Threads/PowerSupplyUpdateThread.cs
similarity index 73%
rename from Source/Program/Threads/PowerSupplyGuiUpdateThread.cs
rename to Source/Program/Threads/PowerSupplyUpdateThread.cs
index 366e7a9..5b5cc38 100644
--- a/Source/Program/Threads/PowerSupplyGuiUpdateThread.cs
+++ b/Source/Program/Threads/PowerSupplyUpdateThread.cs
@@ -32,7 +32,7 @@ namespace ProgramLib
    /// <summary>
    /// Class to spawn thread to update power supply data on GUI
    /// </summary>
-   internal class PowerSupplyGuiUpdateThread : BasicThread
+   internal class PowerSupplyUpdateThread : BasicThread
    {
       private enum Events
       {
@@ -53,7 +53,7 @@ namespace ProgramLib
       /// <summary>
       /// Constructor
       /// </summary>
-      public PowerSupplyGuiUpdateThread()
+      public PowerSupplyUpdateThread()
       {
          _logger = LogManager.GetCurrentClassLogger();
 
@@ -68,7 +68,7 @@ namespace ProgramLib
          });
       }
 
-      ~PowerSupplyGuiUpdateThread()
+      ~PowerSupplyUpdateThread()
       {
          _logger?.Debug($"Entering {this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() ...");
       }
@@ -97,7 +97,7 @@ namespace ProgramLib
 
                if (id == Events.UUT_POWER_ON)
                {
-                  UpdatePowerSupplyGui();
+                  UpdatePowerSupplyData();
                }
                else
                   break;
@@ -113,11 +113,11 @@ namespace ProgramLib
       }
 
       /// <summary>
-      /// Update GUI with data
+      /// Log and update GUI with power supply data
       /// </summary>
       /// <param name=""></param>
       /// <returns></returns>
-      private void UpdatePowerSupplyGui()
+      private void UpdatePowerSupplyData()
       {
          int pollRateMs = 1000;
          _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is running...");
@@ -138,24 +138,18 @@ namespace ProgramLib
 
                if (id == Events.EVENT_TIMED_OUT)
                {
-                  rnd = new Random();
+                  PowerSupplyData data = Program.Instance()._powerSupplySharedData.GetData(PowerSupplyConstants.POWER_DEVICE.STE_PVM_5V.ToString());
 
-                  _mainWindow._mainWindowViewModel.UutPowerLedImagePath = _mainWindow._mainWindowViewModel._imageToResourcePathDict[MainWindowViewModel.Images.LED_OFF];
-                  float num = 20.0f + GenerateRandomFraction();
-                  _powerModuleToPowerDataModelDict["UUT_P20V"].ActualVoltage = num.ToString("0.00");
-                  _powerModuleToPowerDataModelDict["UUT_P20V"].ExpectedVoltage = "20.0";
-                  Thread.Sleep(100);
-                  num = 1.0f + GenerateRandomFraction();
-                  _powerModuleToPowerDataModelDict["UUT_P20V"].ActualCurrent = num.ToString("0.00");
-                  Thread.Sleep(100);
-                  num = 20.0f + GenerateRandomFraction();
-                  _powerModuleToPowerDataModelDict["UUT_N20V"].ActualVoltage = num.ToString("0.00");
-                  _powerModuleToPowerDataModelDict["UUT_N20V"].ExpectedVoltage = "20.0";
-                  Thread.Sleep(200);
-                  _mainWindow._mainWindowViewModel.UutPowerLedImagePath = _mainWindow._mainWindowViewModel._imageToResourcePathDict[MainWindowViewModel.Images.LED_ON];
+                  if (data._initialized)
+                  {
+                     _powerModuleToPowerDataModelDict["UUT_P20V"].ActualVoltage = data._voltage.ToString("0.00");
+                     _powerModuleToPowerDataModelDict["UUT_P20V"].ExpectedVoltage = data._powerSupplyModuleInfo.voltageSetpoint_.ToString("0.00");
+                     _powerModuleToPowerDataModelDict["UUT_P20V"].ActualCurrent = data._current.ToString("0.00");
 
-                  num = 5.0f + GenerateRandomFraction();
-                  _powerModuleToPowerDataModelDict["UUT_N20V"].ActualCurrent = num.ToString("0.00");
+                     _powerModuleToPowerDataModelDict["UUT_N20V"].ActualVoltage = data._voltage.ToString("0.00");
+                     _powerModuleToPowerDataModelDict["UUT_N20V"].ExpectedVoltage = data._powerSupplyModuleInfo.voltageSetpoint_.ToString("0.00");
+                     _powerModuleToPowerDataModelDict["UUT_N20V"].ActualCurrent = data._current.ToString("0.00");
+                  }
                }
                else
                   break;
@@ -168,21 +162,5 @@ namespace ProgramLib
 
          _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is exiting...");
       }
-
-      static float GenerateRandomFraction()
-      {
-         Random rnd = new Random();
-         int randNum = 0;
-         const int minimum = 1;
-
-         randNum = rnd.Next(20);
-
-         if (randNum <= minimum)
-         {
-            randNum += minimum;
-         }
-
-         return (float)(1.0 / (float)randNum);
-      }
    }
 }