The on the spot inspection of natural gas orifice meter is adopting the transitivity calibration method taking Venturi nozzle as calibration scale.
天然气孔板流量计的现场检定，采用以文丘里音速喷嘴作为标准表的传递型校准法。
The paper introduces the component, working principle, automatic calibration and it's application in the aluminium smelter of proportioning belt scale controlled by PLC.
介绍了PLC控制的配料皮带秤的组成、工作原理、自校验功能及其在铝厂碳素系统配料中的应用情况。
More steps are made for the method of calibration at large scale.
进一步研究了大视场下的标定方法。
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