1.1 本试验方法适用于通过电导计和介电计校准石膏板、玻璃面石膏板和纤维增强石膏板的手持式湿度计。该试验使用至少分五（5）步干燥的湿润试样，根据与干重相比的重量损失来确定水分含量。该测试还提供了每个干燥步骤的ERH值。 1.2 本试验方法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 以SI（公制）表示的数值应视为标准。 括号中给出的值是对英寸磅单位的数学转换，仅供参考，不被视为标准。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 本标准试验方法用于校准手持式仪表，以准确读取约30 % 至90 % 呃。水分含量与ERH或A有关 w 一种材料。 5.2 手持式测量仪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取样的方法，并在建筑施工期间和之后进行现场检查。然而，这些测量是推断的，也就是说，测量电气参数并将其与校准曲线进行比较，以获得水分含量的间接测量值。电气测量受到实际含水量、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。 只有意识到每个参数对仪表输出的影响，并按照这些测试方法对读数进行校正，才能获得最大精度。 5.3 电导计和介电计在相同条件下的读数不一定相等。当参考此测试方法时，必须报告所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 这两种类型的仪表都应根据本标准中所述的ERH进行校准。

1.1 This test method applies to the calibration of hand-held 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 five (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 The values stated in SI (metric) are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.4 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. 1.5 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 A w 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.