1.1 本试验方法适用于通过电导和电介质计校准石膏板、玻璃面石膏板和纤维增强石膏板的手持式水分计。该试验使用湿润的试样，该试样至少分5步干燥，以根据与干重相比的重量损失确定含水量。该测试还提供了每个干燥步骤的ERH值。 1.2 本试验方法尚未评估油漆或墙面覆盖材料对石膏板或面板基材指示含水量的影响。 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、健康和环境实践，并确定监管限制的适用性。 1.4 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====== 5.1 本标准试验方法旨在校准手持式仪表，以准确读取约30至90的读数 % 呃。水分含量与材料的ERH或水活性有关。 5.2 手持式仪表提供了一种在制造过程中对石膏板和面板的含水量进行快速采样的方法，以及在建筑施工期间和之后进行现场检查的方法。然而，这些测量是推断的，即测量电气参数并与校准曲线进行比较，以获得水分含量的间接测量。 电气测量受实际含水量、许多其他石膏板和面板变量、环境条件、测量探头的几何形状和仪表设计的影响。只有了解每个参数对仪表输出的影响，并按照这些测试方法的规定校正读数，才能获得最大精度。 5.3 在相同条件下，电导计和电介质计的读数不一定相等。当参考本试验方法时，必须报告使用的仪表类型，以及本标准中规定的精度和偏差的相关范围。 5.4 根据本标准中所述的ERH校准两种类型的仪表。

1.1 This test method applies to the calibration of handheld moisture meters for gypsum board, glass faced gypsum panels and fiber-reinforced gypsum panels by means of electrical conductance and dielectric meters. The test uses wetted test specimens which are dried down in at least 5 steps to determine the moisture content based on the weight loss in comparison to the dry weight. The test also supplies the ERH values for each of the drying steps. 1.2 This test method has not been evaluated for the influence of paint or wall covering materials on the indicated moisture content of a gypsum board or panel substrate. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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 ====== 5.1 This Standard Test Method is intended for use in calibrating hand-held meters to accurately read from approximately 30 to 90 % ERH. Moisture content is related to the ERH or water activity of a material. 5.2 Hand-held meters provide a rapid means of sampling the moisture content of gypsum boards and panels during manufacture and for field inspection during and after building construction. However, these measurements are inferential, that is, electrical parameters are measured and compared against a calibration curve to obtain an indirect measure of moisture content. The electrical measurements are influenced by the actual moisture content, a number of other gypsum board and panel variables, environmental conditions, the geometry of the measuring probe, and the 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 these test methods. 5.3 Electrical conductance and dielectric meters are not necessarily equivalent in their readings under the same conditions. When this test method is referenced, the type of meter that is being used must be reported with the relevant ranges for precision and bias as specified in this standard. 5.4 Both types of meters are to be calibrated with respect to ERH as described in this standard.