49.在使用现场,若无测试仪器,如何检查 XW 系列仪表的不灵敏区是否在0.25%以内?答:在使用现场,可用于拨动记录笔架来检测仪表。具体作法是,仪表运行时,可将位于平衡位置的指针所指刻度作为基准刻度线。用手拨动记录笔架沿刻度始端方向移动全量程的1%,然后放开,指针将回不到基准刻度线 49. At the site of use, if there is no test instrument, how to check whether the insensitive zone of XW series instrument is within 0.25%? Answer: At the use site, it can be used to dial the record carriage to test the instrument. The specific practice is that the instrument is running, you can place the pointer in the equilibrium position of the scale as a reference scale line. Hand to move the record carriage along the beginning of the scale to move the full range of 1%, and then let go, the pointer will not return to the baseline scale