Abstract: According to CB/T14201--2018 determination of compressive strength of iron pellets for blastfurnace and direct reduction, the paper measures therepeatability , testing machine , standard dynamome-ter and uncertainty of each component of computer acquisition system. The compressive strength of ironpellets is measured by the pellet compression tester, and the measurement results are evaluated accordinto JJF1059.1-- 2012 evaluation and expression of measurement uncertainty. The results show that themeasurement uncertainty is Ugs( P) = 3. 2% , k =2. The results show that through the evaluation and a-nalysis of the measurement uncertainty of each component, the measurement repeatability component hasthe greatest influence on the measurement uncertainty: the detection reproducibility of this method is bet-ter than that of the existing methods: a lot of operation time is saved.

Key words:  iron pellet, compressive strength, uncertainty