diff --git a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
index 413848d..5f0cab0 100644
--- a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
+++ b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
@@ -367,6 +367,12 @@ class BleManager private constructor(private val context: Context) {
         sendRaw(CRC16.buildCommand("mbb"))
     }
 
+    /** 6채널 측정만 (maa, rbb 헤더 없이 바로 reb×6→raa) */
+    fun sendChannelsOnly() {
+        piezoCollector.startMultiChannel(6)
+        sendRaw(CRC16.buildCommand("maa", intArrayOf(0)))
+    }
+
     fun startBatteryPolling() {
         batteryTimer?.let { handler.removeCallbacks(it) }
         sendBatteryQuery()
diff --git a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
index cc79a4d..2ebb4f9 100644
--- a/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
+++ b/app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt
@@ -181,7 +181,7 @@ fun PiezoMonitoringView(appState: AppState) {
         }
         bleManager.piezoCollector.onLog = { msg -> Log.d("PiezoCollector", msg) }
 
-        bleManager.sendFullMeasurement()
+        bleManager.sendChannelsOnly()
 
         // Timeout with auto-retry (15s)
         handler.postDelayed({
@@ -190,7 +190,7 @@ fun PiezoMonitoringView(appState: AppState) {
                 measureRetryCount++
                 Log.w("PiezoMonitor", "Timeout — auto-retry $measureRetryCount/$maxMeasureRetries")
                 bleManager.piezoCollector.reset()
-                bleManager.sendFullMeasurement()
+                bleManager.sendChannelsOnly()
                 // Second timeout for retry
                 handler.postDelayed({
                     if (!isMeasuring) return@postDelayed
@@ -236,11 +236,11 @@ fun PiezoMonitoringView(appState: AppState) {
                 autoTickCount++
 
                 if (autoTickCount % 10 == 0) {
-                    // 10초째: 전체 측정 (mbb → rbb + reb×6 + raa)
+                    // 10초째: 6ch 측정
                     if (!isMeasuring) measure()
                 } else {
                     // 1~9초: IMU 쿼리 (msp → rsp)
-                    bleManager.sendImuQuery()
+                    if (!isMeasuring) bleManager.sendImuQuery()
                 }
             }
         }