diff --git a/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs b/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs
index a19ae0ce5..a4ebfb7bd 100644
--- a/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs
+++ b/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs
@@ -37,6 +37,7 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
         public int WMType_ID { get { return iperlHeadCfg.ProcParams.WMType_ID; } }		/// Required by Oracle DB
 		public int WMType_Rev { get { return iperlHeadCfg.ProcParams.WMType_Rev; } }	/// Required by Oracle DB
 #endif
+        public float CalibTarget { get { return (ushort)iperlHeadCfg.ProcParams.CalibTarget; } }
 		public ushort FactorLimitLo { get { return (ushort)iperlHeadCfg.ProcParams.FactorLimitLo; } }
 		public ushort FactorLimitHi { get { return (ushort)iperlHeadCfg.ProcParams.FactorLimitHi; } }
 
@@ -163,7 +164,7 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 		public UInt16 CalculateNewCalibFactor(Results.Entities.MeterTestRslt adjustTestResult, UInt16 originalCalibrationFactor, UInt16 FactorLimitLo, UInt16 FactorLimitHi)
 		{
 			double meterVolume = adjustTestResult.VolumeMeter;
-			double refVolume = adjustTestResult.VolumeRef;
+            double targetVolume = adjustTestResult.VolumeRef * (1.0f + CalibTarget / 100.0f);
 
 			OrigCalibFactor = originalCalibrationFactor;
 
@@ -171,12 +172,14 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 			{
 				PositiveCounting = VolumeLtrEnd > VolumeLtrStart;
 
-				UInt16 newFactor = (UInt16)((double)originalCalibrationFactor * refVolume / meterVolume + 0.5);
-				log.InfoFormat("Calibration factor: orig={0} new={1} V_iperl={2} V_ref={3}",
+				UInt16 newFactor = (UInt16)((double)originalCalibrationFactor * targetVolume / meterVolume + 0.5);
+				log.InfoFormat("Calibration factor: orig={0} new={1} V_iperl={2} V_ref={3} V_target={4}",
 							   originalCalibrationFactor,
 							   newFactor,
 							   meterVolume.ToString("F3"),
-							   refVolume.ToString("F3"));
+                               adjustTestResult.VolumeRef.ToString("F3"),
+                               targetVolume.ToString("F3"));
+
 
 				if (newFactor < FactorLimitLo || newFactor > FactorLimitHi) return 0;
 
diff --git a/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/ProcParams.cs b/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/ProcParams.cs
index cfab5de4a..e7c410012 100644
--- a/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/ProcParams.cs
+++ b/TestBenchFramework/BenchControl/TestMethods/iPerlCommunication/iPerlHead/ProcParams.cs
@@ -17,6 +17,7 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 		protected override XmlSerializer GetSerializer() { return Serializer; }
 
 		public MeterType MeterType;
+        public float CalibTarget;                           /// Target error after calibration in [%]
 		public int FactorLimitLo;							/// Lower limit for the calibration factor
 		public int FactorLimitHi;							/// Upper limit for the calibration factor
 #if ORACLE_DB
@@ -28,6 +29,7 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 		public override void InitializeAll()
 		{
 			MeterType = MeterType.AutoDetect;
+            CalibTarget = 0;
 			FactorLimitLo = 1000;
 			FactorLimitHi = 8000;
 #if ORACLE_DB
@@ -39,6 +41,7 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 		string[] paramNames = new string[]
 		{
             "iPerl type",
+            "Calib. target [%]",
 			"Calib. factor Lo",
 			"Calib. factor Hi",
 #if ORACLE_DB
@@ -54,11 +57,12 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 			switch (i)
 			{
 				case 0: return MeterType.ToString();
-				case 1: return FactorLimitLo.ToString();
-				case 2: return FactorLimitHi.ToString();
+                case 1: return CalibTarget.ToString();
+				case 2: return FactorLimitLo.ToString();
+				case 3: return FactorLimitHi.ToString();
 #if ORACLE_DB
-                case 3: return WMType_ID.ToString();
-                case 4: return WMType_Rev.ToString();
+                case 4: return WMType_ID.ToString();
+                case 5: return WMType_Rev.ToString();
 #endif
 				default: return string.Empty;
 			}
@@ -74,11 +78,12 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 						if (mt.ToString().Equals(strValue)) { MeterType = mt; return; }
 					}
 					break;
-				case 1: FactorLimitLo = int.Parse(strValue); return;
-				case 2: FactorLimitHi = int.Parse(strValue); return;
+                case 1: CalibTarget = Utils.ParseSFloat(strValue); return;
+				case 2: FactorLimitLo = int.Parse(strValue); return;
+				case 3: FactorLimitHi = int.Parse(strValue); return;
 #if ORACLE_DB
-                case 3: WMType_ID = int.Parse(strValue); return;
-                case 4: WMType_Rev = int.Parse(strValue); return;
+                case 4: WMType_ID = int.Parse(strValue); return;
+                case 5: WMType_Rev = int.Parse(strValue); return;
 #endif
 				default: return;
 			}
@@ -89,20 +94,24 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 			message = string.Empty;
 
             int iDummy;
+            float fDummy;
 
 			switch (i)
 			{
 				case 0:
 					for (MeterType mt = 0; mt < MeterType.Count; mt++) if (mt.ToString().Equals(strValue)) return true;
 					break;
-				case 1:
+                case 1:
+                    if (Utils.TryParseSFloat(strValue, out fDummy) && fDummy >= -10.0f && fDummy <= 10.0f) return true;
+                    break;
 				case 2:
+				case 3:
                     if (int.TryParse(strValue, out iDummy) && iDummy >= 1000 && iDummy <= 8000) return true;
                     break;
 
 #if ORACLE_DB
-                case 3:    /// WMType_ID
-                case 4:    /// WMType_Rev
+                case 4:    /// WMType_ID
+                case 5:    /// WMType_Rev
                     if (int.TryParse(strValue, out iDummy)) return true;
                     break;
 #endif
@@ -118,6 +127,7 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
 		void CopyContentTo(ProcParams prms)
 		{
 			prms.MeterType = this.MeterType;
+            prms.CalibTarget = this.CalibTarget;
 			prms.FactorLimitLo = this.FactorLimitLo;
 			prms.FactorLimitHi = this.FactorLimitHi;
 #if ORACLE_DB
diff --git a/TestBenchFramework/Properties/AssemblyInfo.cs b/TestBenchFramework/Properties/AssemblyInfo.cs
index 1ea683953..a923de5d3 100644
--- a/TestBenchFramework/Properties/AssemblyInfo.cs
+++ b/TestBenchFramework/Properties/AssemblyInfo.cs
@@ -29,5 +29,5 @@ using System.Runtime.InteropServices;
 //      Build Number
 //      Revision
 //
-[assembly: AssemblyVersion("2.16.658.1")]
-[assembly: AssemblyFileVersion("2.16.658.1")]
+[assembly: AssemblyVersion("2.16.660.1")]
+[assembly: AssemblyFileVersion("2.16.660.1")]