1.1本试验方法描述了用于测量明渠中水流速度的杯形或叶片式垂直轴流量计和螺旋桨式水平轴流量计的设计和使用。 1.2本试验方法主要适用于通常用于明渠液压（有别于海洋学）应用中且有操作员在场的仪表。 1.3本试验方法主要适用于测量一个流量成分或灯丝的流量计。 1.4以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1本试验方法描述了各种类型电流表的设计和使用。这些流速计通常用于测量明渠横截面中某一点的流速，作为流速区域穿越的一部分，以确定水的流速。为此，应结合试验方法D3858使用。

1.1 This test method describes the design and use of cup-type or vane-type vertical axis current meters and propeller-type horizontal axis current meters for measuring water velocities in open channels. 1.2 This test method is intended primarily for those meters customarily used in open-channel hydraulic (as distinguished from oceanographic) applications with an operator in attendance. 1.3 This test method is intended primarily for current meters that measure one component or filament of flow. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 This test method describes the design and use of various types of current meters. These current meters are commonly used to measure the velocity at a point in an open channel cross section as part of a velocity-area traverse to determine the flowrate of water. To this end it should be used in conjunction with Test Method D3858.