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什么是水表的誤差

瀏覽次數: 日期:2012-9-29

  誤差是一個計量學術語,它指的是測量結果與真實值之間的差異。
  我們知道在計量學的范疇里,任何的測量都是有誤差的,即測量值與真實值只能無限接近,水表也是如此。 具體到水表這種一計量器具來說,它的誤差是用相對誤差來表示的。
  例:假設一塊水表在5m/h的流量下顯示流過了100L水,通過試驗我們知道實際流過的水的體積是l00. 2L。那么,根據公式我們可以計算出其相對誤差為:(100一100.2)/100.2*100%=-0.2%

  于是我們得出,這塊水表在5m/h的流量下的誤差是-0.2%,在這里,負號的意思是水表比實際值走的慢了。 而且水表的誤差在不同的流量.下是不一樣的,并遵循著一定的規律。如果在水表的量程范圍內對水表的一些特征流量點分別進行誤差值的測試,并在圖上繪制出來,就可以得到一條誤差值歲流量變化的“流量誤差特性曲線

這條曲線代表了這塊水表的計量特性,是水表重要的性能指標。

所屬類別: 儀表常識

該資訊的關鍵詞為:

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