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標準氣體特性量值不確定度應考慮以下組成
標準氣體特性量值不確定度的評定應符合JJF1059-1999《測量不確定度評定和表示》中的規定,湖北標準氣體,湖北工業氣體廠家推薦采用《標準物質及其應用技術》一書中氣體標準物質不確定度分析(3.10.4)對標準氣體的不確定度進行評度,每一不確定度應附有所聲明置信水平下的擴展因子。
標準氣體特性量值不確定度應考慮以下組成:
1、通過測量數據的標準偏差、測量次數及所要求的置信水平按統計學方法計算出的不確定度分量;
2、由均勻性檢驗結果獲得的由標準氣體均勻性引入的不確定度分量;
3、由穩定性檢驗結果獲得的由標準氣體穩定性引入的不確定度分量,該不確度分量應同時考慮長期穩定性和短期穩定性兩種因素的影響。如果在總不確定度中沒有考慮標準物質運輸和使用過程中短期穩定性的影響,應在證書上向用戶清楚說明,或根據不同的運輸及使用情形給出額外的不確度度分量。
標準氣體生產者應采取措施盡量通過不斷改進測量方法的準性和可靠性減少后面三種不確定度分量所占的比重。隨著測量性能的提高,應重新評定不確定度,以更好滿足客戶使用要求。
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