> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-tx310-ultrasonic-flowmeter-manual-chinese-v3/2.-an-zhuang-fang-shi/untitled-2/2.3.2-lei-bi-shu-chu.md).
# 2.3.2 類比輸出
本產品亦內建一組4-20mA 類比電流輸出訊號，提供做量測值的類比輸出，相關使用事項如下：
**(4-20mA 輸出解析度為12bit)**
● 可以選擇流量、流速、上游溫度、下游溫度流體聲速、上下游溫度差等輸出。
● 可自訂上下限。提供所需要的輸出範圍。
● 本 4-20mA 為 3-wire 接線，只要主機 DC 供電，4-20mA 端子不需要外部電源輸入。接線時請依照下圖：
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