stop-down metering 非全开﹝光圈﹞式测光 ; 收缩光圈测光
It is considered that effective measures should be taken to eliminate metering error, reduce the loss of crude oil in order to cut down economic loss.
针对一些石化企业原油需要油船运输的特点来分析途耗形成的原因，通过采取相应措施，可以减少计量误差，降低途耗，减少经济损失。
PT secondary voltage step-down is one of the reason which causes the comprehensive error of the electric energy metering equipment.
而PT二次压降又是引起电能计量装置综合误差的直接原因之一。
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