diff --git a/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java b/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java
index ed25f754..57feb7b8 100644
--- a/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java
+++ b/detection/src/main/java/com/njcn/gather/detection/handler/SocketFreqConverterDevService.java
@@ -275,6 +275,9 @@ public class SocketFreqConverterDevService {
 
             if (DetectionCodeEnum.MAG.getCode().equalsIgnoreCase(sqlDataDTO.getDesc())) {
                 residualVoltage = value;
+                if (residualVoltage <= 6) {
+                    return;
+                }
             } else if (DetectionCodeEnum.DUR.getCode().equalsIgnoreCase(sqlDataDTO.getDesc())) {
                 durationMs = (int) Math.round(value * 1000);
             }