# 2.4.2 Q 值

Q 值代表所收到的訊號品質可視為一種訊噪比（SNR）的指標，該數值介面的右下方數值位於0\~100％之間，而正常情況下大多>60％。Q 值越高代表訊號品質越好，所量測到的數值越可信，Q 值若小於10％ 便無法量測，可嘗試執行下列幾個方法： 

● 有時RSSI 值雖高但卻可能因為探頭些微的距離，角度等誤差而造成Q 值不良。嘗試小幅度調整探頭的距離及角度。 

● 不平滑的管壁，試著把管壁磨平並且確認探頭是否緊貼外管壁。 

● 耦合劑塗佈不均勻，重新塗佈調整。 

● 若管內壁雜質髒污等造成狀況不堪，建議更換量測位置。 

● 周邊設備電磁波的干擾更換位置或是加強屏蔽。 

● 流體流場混亂嘗試變更安裝位置。 

● 管徑較大的管路。嘗試改為Z 法架設探頭。


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