1.1本实施规程涵盖调整机载离散颗粒计数器（DPC）尺寸范围的程序，以匹配参考DPC的尺寸/浓度数据，参考DPC已根据实施规程F 328校准计数和尺寸精度，并保持良好工作状态。该规程适用于实施规程F 328中的程序所需的时间、能力或两者均不可用的情况。当可能需要一个以上的DPC来观察一个环境时，尤其有用，在该环境中，正在计数和确定尺寸的颗粒材料的成分不同于实施例F 328中用于校准的精密球形颗粒材料和/或所有使用的DPC在光学或电子设计上不相似。 1.2此处涵盖的程序包括测量采样和观察的风量或流速、零计数水平、粒度和计数精度、粒度分辨率、颗粒计数效率和颗粒浓度极限的程序。

1.1 This practice covers procedures for adjusting the size ranges of an airborne discrete particle counter (DPC) to match size/concentration data from a reference DPC that has been calibrated for counting and sizing accuracy in accordance with Practice F 328 and is kept in good working order. The practice is applied in situations where time, capabilities, or both, required for carrying out procedures in Practice F 328 are not available. It is particularly useful where more than one DPC may be required to observe an environment where the particulate material being counted and sized is different in composition from the precision spherical particulate materials used for calibration in Practice F 328 and/or all of the DPCs in use are not similar in optical or electronic design. 1.2 Procedures covered here include those to measure sampled and observed air volume or flow rate, zero count level, particle sizing and counting accuracy, particle sizing resolution, particle counting efficiency, and particle concentration limit.