diff --git a/ViewModels/D7896ViewModel.cs b/ViewModels/D7896ViewModel.cs
index c37426a..70ed561 100644
--- a/ViewModels/D7896ViewModel.cs
+++ b/ViewModels/D7896ViewModel.cs
@@ -444,7 +444,7 @@ public partial class D7896ViewModel : ObservableObject
                 // 测量间隔（即使舍弃也等待，让样品恢复）
                 if (validCount < requiredCount && !_stopRequested && attemptCount < maxAttempts)
                 {
-                    try { await Task.Delay(_config.TestParameters.IntervalSeconds * 1000, _testCts.Token); } catch (OperationCanceledException) { break; }
+                    try { await Task.Delay(_config.TestParameters.IntervalSeconds * 200, _testCts.Token); } catch (OperationCanceledException) { break; }
                 }
             }
 
diff --git a/Window1.xaml b/Window1.xaml
index 5719259..db1ef6f 100644
--- a/Window1.xaml
+++ b/Window1.xaml
@@ -16,7 +16,7 @@
         <GroupBox Header="串口设置" Grid.Row="0" Margin="5">
             <StackPanel Orientation="Horizontal" Margin="5">
                 <Label Content="端口:"/>
-                <ComboBox x:Name="cmbPort" Width="80" IsEditable="True"/>
+                <ComboBox x:Name="cmbPort" Width="80" IsEditable="True" Text="COM2"/>
                 <Label Content="波特率:" Margin="10,0,0,0"/>
                 <ComboBox x:Name="cmbBaudrate" Width="80" SelectedIndex="1">
                     <ComboBoxItem>9600</ComboBoxItem>
diff --git a/Window1.xaml.cs b/Window1.xaml.cs
index 52768aa..0d3c43b 100644
--- a/Window1.xaml.cs
+++ b/Window1.xaml.cs
@@ -31,6 +31,7 @@ namespace ConstantCurrentControl
             _readTimer = new DispatcherTimer();
             _readTimer.Interval = TimeSpan.FromMilliseconds(50);
             _readTimer.Tick += ReadTimer_Tick;
+            cmbPort.Text = "COM2";
         }
 
         #region 串口连接