diff --git a/TBF/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs b/TBF/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs
index b1fba8734..2859bb445 100644
--- a/TBF/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs
+++ b/TBF/BenchControl/TestMethods/iPerlCommunication/iPerlHead/IperlHead.cs
@@ -19,8 +19,11 @@ namespace TBF.BenchControl.TestMethods.iPerlCommunication.iPerlHead
         private static readonly ILog log = LogManager.GetLogger(typeof(IperlHead));
         public override string ToString() { return string.Format("iPerl({0})", Cfg.ToString(1)); }
 
-
+#if TURA_SPECIAL
+        public const int MaxOptoDataCount = 250000;
+#else
         public const int MaxOptoDataCount = 40000;
+#endif
         public const int StartOptoDataCount = MaxOptoDataCount / 2;
         public const int EndOptoDataCount = MaxOptoDataCount - StartOptoDataCount;