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JA系列电子天平的三种称量方法

Update time:2018-08-14 13:08:49The number of clicks:7477TimesSize:T|T
电子天平是 一种精密称重衡器,相比桌式电子秤、台式电子秤具有更高的精度和稳定性。你知道电子天平有哪些称量方法吗?其实电子天平的称量方法有三种,直接称量法、固定质量称量法、递减称量法。

  JA系列电子天平是一种精密称重衡器,相比桌式电子秤、台式电子秤具有更高的精度和稳定性。你知道电子天平有哪些称量方法吗?其实电子天平的称量方法有三种,直接称量法、固定质量称量法、递减称量法。对于一般物体的称量我们一般都采用直接称量法,然而对于某些特殊物体的称量,我们并不能按常规方法来处理,尤其是实验室中的化学试剂。

 

JA系列电子天平

 

  直接称量法:

  此法是将称量物直接放在JA系列电子天平盘上直接称量物体的质量。例如,称量小烧杯的质量,容量器皿校正中称量某容量瓶的质量,重量分析实验中称量某坩埚的质量等,都使用这种称量法。

  固定质量称量法:

  此法又称增量法,此法用于称量某一固定质量的试剂(如基准物质)或试样。这种称量操作的速度很慢,适于称量不易吸潮、在空气中能稳定存在的粉末状或小颗粒(*小颗粒应小于0.1 mg,以便容易调节其质量)样品。

  注 意:若不慎加入试剂超过指定质量,应先关闭升降旋钮,然后用牛角匙取出多余试剂。重复上述操作,直至试剂质量符合指定要求为止。严格要求时,取出的多余试 剂应弃去,不要放回原试剂瓶中。操作时不能将试剂散落于天平盘等容器以外的地方,称好的试剂必须定量地由表面皿等容器直接转入接受容器,此即所谓“定量转移”。

  递减称量法:

  又称减量法,此法用于称量一定质量范围的样品或试剂。在称量过程中样品易吸水、易氧化或易与CO2等反应时,可选择此法。由于称取试样的质量是由两次称量之差求得,故也称差减法。

(Edit:rrkj2017)
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