ViewModels/D7896ViewModel.cs

@@ -784,7 +784,18 @@ public partial class D7896ViewModel : ObservableObject
         CurrentMeasurementIndex = 0;
         StatusMessage = "已重置";
         TestDateTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
-        TemperatureCurveModel = null;
+
+        // 清空曲线：新建一个空白的 PlotModel 替换原来的
+        TemperatureCurveModel = new PlotModel
+        {
+            Title = "温升与冷却曲线",
+            Background = OxyColors.White
+        };
+        TemperatureCurveModel.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom, Title = "时间 (s)" });
+        TemperatureCurveModel.Axes.Add(new LinearAxis { Position = AxisPosition.Left, Title = "温升 (℃)" });
+        TemperatureCurveModel.InvalidatePlot(true);
+
+        CurveTitle = "温升曲线";
     }
 
     [RelayCommand]