diff --git a/Models/AppConfig.cs b/Models/AppConfig.cs
index 535ca5f..b973c10 100644
--- a/Models/AppConfig.cs
+++ b/Models/AppConfig.cs
@@ -46,7 +46,7 @@ public class TestParameters
     public int MeasurementCount { get; set; } = 10;
     [Range(5, 300)]
     public int IntervalSeconds { get; set; } = 30;
-    public double PlatinumWireLength { get; set; } = 0.056; // 默认 5.6 cm
+    public double PlatinumWireLength { get; set; } = 0.040; // 默认 5.6 cm
     public double PlatinumWireDiameter { get; set; } = 0.00006;
     public string ReportOutputPath { get; set; } = "Reports\\";