diff --git a/TBF/Rig/TestMethods/iPerlCommunication/iPerlCommunicationForm.cs b/TBF/Rig/TestMethods/iPerlCommunication/iPerlCommunicationForm.cs
index f986243da..465ab5858 100644
--- a/TBF/Rig/TestMethods/iPerlCommunication/iPerlCommunicationForm.cs
+++ b/TBF/Rig/TestMethods/iPerlCommunication/iPerlCommunicationForm.cs
@@ -1060,23 +1060,25 @@ namespace TBF.Rig.TestMethods.iPerlCommunication
 		        }
 		        
 		        var gciFullLoginResult = iHead.OptoHeadTest.PrepareQ3Calibration(cfg, NextTest, wm);
-		        if (!string.IsNullOrEmpty(resultStr) &&
-		            resultStr.Equals(TBF.Rig.RegisterReaders.GenesisRegReader.communication.OptoHeadTest.ResultOk))
+		        log.Debug($"PrepareSlotQ3Calibration(threadId: {threadId}, iHead: {iHead?.Name}) result:{gciFullLoginResult}");
+		        if (!string.IsNullOrEmpty(gciFullLoginResult) &&
+		            gciFullLoginResult.Equals(TBF.Rig.RegisterReaders.GenesisRegReader.communication.OptoHeadTest.ResultOk))
 		        {
-			        log.DebugFormat("PrepareQ3Calibration successfull threadId={0}", threadId);
+			        log.DebugFormat("PrepareQ3Calibration successfull threadId={0} head={1}", threadId, iHead?.Name);
 			        resultStr = string.Format($"Write Q3 Calibration: OK");
 			        // note Q3 calibration is done
 			        error = CommErr.None;
 		        }
 		        else
 		        {
+			        log.DebugFormat("PrepareQ3Calibration failed threadId={0} head={1}", threadId, iHead?.Name);
 			        resultStr = "Write Q3 Calibration: Failed";
 		        }
 
 		        return error;
 	        }catch (Exception ex)
 	        {
-		        log.ErrorFormat("PrepareSlotQ3Calibration() threadId={0}, Error: {1}", threadId, ex.Message);
+		        log.ErrorFormat("PrepareSlotQ3Calibration() threadId={0}, iHead: {1}, Error: {2}", threadId,iHead, ex.Message);
 		        return CommErr.FailedPrepare;
 	        }
         }
@@ -1116,8 +1118,8 @@ namespace TBF.Rig.TestMethods.iPerlCommunication
 		        }
 
 		        var gciFullLoginResult = iHead.OptoHeadTest.WriteQ3Calibration(cfg, BeforeTest, wm);
-		        if (!string.IsNullOrEmpty(resultStr) &&
-		            resultStr.Equals(TBF.Rig.RegisterReaders.GenesisRegReader.communication.OptoHeadTest.ResultOk))
+		        if (!string.IsNullOrEmpty(gciFullLoginResult) &&
+		            gciFullLoginResult.Equals(TBF.Rig.RegisterReaders.GenesisRegReader.communication.OptoHeadTest.ResultOk))
 		        {
 			        log.Debug("SlotLogin successful");
 			        resultStr = string.Format($"Write Q3 Calibration: OK");
@@ -1749,6 +1751,7 @@ namespace TBF.Rig.TestMethods.iPerlCommunication
                 }
                 else
                 {
+	                log.Debug("Wait for finish workerThreads 2seconds");
                     /// Wait until all threads are finished
                     workerThreads[data.ThreadId].Join(2000);
                     NormalClose();