1.1 这些机械土壤压实机校准规程用于根据试验方法检查和调整实验室压实土壤和土壤骨料时使用的机械设备 D698 , D1557 实践 D6026 ，以及其他可能指定这些实践的类似方法。在一个机构中使用的校准不符合设备在另一个机构中使用的条件。 1.2 机械夯的重量按中所述进行调整 5.4 和 6.5 为了使机械压实机产生与手动压实机相同的结果。 1.3 提供以下两种替代程序: 部分 练习A 基于压缩的校准 选定的土壤样本 5. 实践B 基于变形的校准 标准铅筒 6. 1.4 如果按照规程a或规程B的要求校准机械压实机，则机械压实机无需满足其他规程的要求。 1.5 以英寸-磅为单位的数值应视为标准值。括号中给出的值仅供参考。 1.5.1 工程专业中的常见做法是同时使用磅来表示质量单位（lbm）和力（lbf）。 这隐含地结合了两个独立的单元系统；也就是说，绝对系统和引力系统。在一个标准中结合使用两套独立的英寸-磅单位在科学上是不可取的。本标准是在处理英寸-磅系统时使用重力单位制编写的。在该系统中，磅（lbf）表示力（重量）的单位。然而，使用天平或天平记录磅质量（lbm）或记录密度（lbm/ft） 3. 不应视为不符合本标准。 1.6 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、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 3.1 机械压实机通常用于代替试验方法所需的手动压实机 D698 和 D1557 在需要增加产量的情况下。 3.2 机械压实机的设计需要有一个校准过程，该过程不仅仅是确定锤的质量和落差。 注1: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。实践中符合标准的机构 D3740 通常认为能够胜任和客观的测试/采样/检查/等。本标准的用户应注意遵守惯例 D3740 本身并不能保证可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 These practices for the calibration of mechanical soil compactors are for use in checking and adjusting mechanical devices used in laboratory compacting of soil and soil-aggregate in accordance with Test Methods D698 , D1557 , Practice D6026 , and other methods of a similar nature that might specify these practices. Calibration for use with one practice does not qualify the equipment for use with another practice. 1.2 The weight of the mechanical rammer is adjusted as described in 5.4 and 6.5 in order to provide for the mechanical compactor to produce the same result as the manual compactor. 1.3 Two alternative procedures are provided as follows: Section Practice A Calibration based on the compaction of a selected soil sample 5 Practice B Calibration based on the deformation of a standard lead cylinder 6 1.4 If a mechanical compactor is calibrated in accordance with the requirements of either Practice A or Practice B, it is not necessary for the mechanical compactor to meet the requirements of the other practice. 1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.5.1 It is common practice in the engineering profession to concurrently use pounds to represent both a unit of mass (lbm) and a force (lbf). This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. This standard has been written using the gravitational system of units when dealing with the inch-pound system. In this system, the pound (lbf) represents a unit of force (weight). However, the use of balances or scales recording pounds of mass (lbm) or the recording of density in lbm/ft 3 shall not be regarded as a nonconformance with this standard. 1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 3.1 Mechanical compactors are commonly used to replace the hand compactors required for Test Methods D698 and D1557 in cases where it is necessary to increase production. 3.2 The design of mechanical compactors is such that it is necessary to have a calibration process that goes beyond determining the mass and drop of the hammer. Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria in Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/and the like. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.