diff --git a/server/src/Controllers/OscilloscopeController.cs b/server/src/Controllers/OscilloscopeController.cs
index f7bce73..a8c279f 100644
--- a/server/src/Controllers/OscilloscopeController.cs
+++ b/server/src/Controllers/OscilloscopeController.cs
@@ -10,7 +10,7 @@ namespace server.Controllers;
 /// </summary>
 [ApiController]
 [Route("api/[controller]")]
-[Authorize(Roles = "User")]
+[Authorize]
 public class OscilloscopeApiController : ControllerBase
 {
     private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
@@ -298,21 +298,11 @@ public class OscilloscopeApiController : ControllerBase
             if (oscilloscope == null)
                 return BadRequest("用户未绑定有效的实验板");
 
-            // 并行获取所有数据
-            var freqTask = oscilloscope.GetADFrequency();
-            var vppTask = oscilloscope.GetADVpp();
-            var maxTask = oscilloscope.GetADMax();
-            var minTask = oscilloscope.GetADMin();
-            var waveformTask = oscilloscope.GetWaveformData();
-
-            await Task.WhenAll(freqTask.AsTask(), vppTask.AsTask(), maxTask.AsTask(), 
-                             minTask.AsTask(), waveformTask.AsTask());
-
-            var freqResult = await freqTask;
-            var vppResult = await vppTask;
-            var maxResult = await maxTask;
-            var minResult = await minTask;
-            var waveformResult = await waveformTask;
+            var freqResult = await oscilloscope.GetADFrequency();
+            var vppResult = await oscilloscope.GetADVpp();
+            var maxResult = await oscilloscope.GetADMax();
+            var minResult = await oscilloscope.GetADMin();
+            var waveformResult = await oscilloscope.GetWaveformData();
 
             if (!freqResult.IsSuccessful)
             {
diff --git a/server/src/Peripherals/OscilloscopeClient.cs b/server/src/Peripherals/OscilloscopeClient.cs
index ad04055..b4fabe5 100644
--- a/server/src/Peripherals/OscilloscopeClient.cs
+++ b/server/src/Peripherals/OscilloscopeClient.cs
@@ -70,7 +70,7 @@ class Oscilloscope
     private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
 
     readonly int timeout = 2000;
-    readonly int taskID = 1;
+    readonly int taskID = 0;
 
     readonly int port;
     readonly string address;
@@ -327,7 +327,7 @@ class Oscilloscope
             return new(ret.Error);
         }
         var data = ret.Value;
-        if (data == null || data.Length != OscilloscopeAddr.RD_DATA_LENGTH)
+        if (data == null || data.Length != OscilloscopeAddr.RD_DATA_LENGTH / 8)
         {
             logger.Error($"Waveform data length mismatch: {data?.Length}");
             return new(new Exception("Waveform data length mismatch"));