1.1本试验方法适用于测量实木制品的含水量（MC），包括用于实验室标准化和手持式水分计校准的含有添加剂（即化学品或粘合剂）的产品 1.2本试验方法不区分标准化仪表测量技术和校准要求。规定了试样尺寸，以适应特定的仪表。 附录X1 提供与必填部分相对应的解释性讨论和历史记录。基本测量技术见 附录X2 可用时。 1.2.1在相同条件下，采用不同技术的仪表可能无法提供等效读数。当采用本试验方法时，除非另有规定，否则假设参考仪表是可接受的。 仪表应通过试验方法确定的直接测量相对于MC进行校准 D4442 . 1.3 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====== 4.1手持式仪表提供了在加工期间和之后对木质材料进行MC采样的快速方法，以保持质量保证和符合标准。这些测量受实际MC、许多其他木材变量、环境条件、测量探头电路的几何形状和仪表设计的影响。只有意识到每个参数对仪表输出的影响，并按照本试验方法的规定校正读数，才能获得最大精度。 4.1.1本试验方法采用受控条件和直纹透明木材试样，以提供可在实验室再现的测量结果。受控条件可防止试样中出现水分和温度梯度。 4.1.2在实验室校准中，参考直接水分测量（例如，试验方法 D4442 )只能在仪表的直接测量区域内进行。这最大限度地减少了与本试验方法和参考（试验方法）之间不同测量区域采样相关的误差 D4442 ). 4.2手持式湿度计的大多数用途都采用了仪表读数与木材面积或体积之间的相关（预测）关系，这些关系超过了直接仪表测量的关系（例如，较大的样本、木块或批次）。这些相关关系超出了本试验方法的范围。 （参见实践 D7438 .)

1.1 This test method applies to the measurement of moisture content (MC) of solid wood products, including those containing additives (that is, chemicals or adhesives) for laboratory standardization and calibration of hand-held moisture meters 1.2 This test method makes no distinction between meter measurement technologies for standardization and calibration requirements. Provision is made for test specimen size to accommodate specific meters. Appendix X1 provides an explanatory discussion and history corresponding to the mandatory sections. Fundamental measurement technologies are described in Appendix X2 when available. 1.2.1 Meters employing differing technologies may not provide equivalent readings under the same conditions. When this test method has been applied, it is assumed that the referenced meter is acceptable unless otherwise specified. Meters shall be calibrated with respect to MC by direct measurement as determined by Test Methods D4442 . 1.3 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 ====== 4.1 Hand-held meters provide a rapid means of sampling MC of wood-based materials during and after processing to maintain quality assurance and compliance with standards. These measurements are influenced by actual MC, a number of other wood variables, environmental conditions, geometry of the measuring probe circuitry, and design of the meter. The maximum accuracy can only be obtained by an awareness of the effect of each parameter on the meter output and correction of readings as specified by this test method. 4.1.1 This test method employs controlled conditions and straight-grain, clear wood specimens to provide measurements that are reproducible in a laboratory. The controlled conditions prevent moisture and temperature gradients in the test specimen. 4.1.2 In laboratory calibration, the reference direct moisture measurements (for example, Test Methods D4442 ) shall be made only in the area of direct measurement of the meter. This minimizes error associated with sampling of differing areas of measurement between this test method and that of the reference (Test Methods D4442 ). 4.2 Most uses of hand-held moisture meters employ correlative (predictive) relationships between the meter reading and wood areas or volumes that exceed that of the direct meter measurement (for example, larger specimens, pieces of lumber, or lots). These correlative relationships are beyond the scope of this test method. (See Practice D7438 .)