1.1 概述: 1.1.1 本试验方法包括通过湿球和干球温度读数测定大气湿度。 1.1.2 本试验方法适用于地球表面的气象测量、材料试验以及大多数标准大气和试验大气的相对湿度测定。 1.1.3 当仅需要湿球温度时，该试验方法也适用。在这种情况下，仪器仅包括湿球温度计。 1.1.4 相对湿度（RH）不表示单位。相对湿度的不确定性表示为 相对湿度 ± 相对湿度 %，这意味着相对湿度预计在( 相对湿度 − 相对湿度 ) % 至( 相对湿度 + 相对湿度 ) %, 哪里 相对湿度 是观察到的相对湿度。所有不确定性都在95 % 置信水平。 1.2 方法A- 吸入通风湿度计: 1.2.1 该方法包括通过抽吸通风的湿度计。 吸气式湿度计比悬挂式（旋转式）湿度计更准确（见方法B），并且在所需空间、使用替代类型温度计（例如，电温度计）的可能性、温度计灯泡更容易屏蔽外来辐射、意外破损和方便性方面具有优势。 1.2.2 该方法适用于环境温度范围5 °C至80 °C，湿球温度不低于1 °C，环境压力与标准大气压力相差不超过30 %. 1.3 方法B- 旋转通风湿度计（吊索式湿度计）: 1.3.1 该方法包括通过旋转通风的湿度计（吊索式湿度计）。 1.3.2 该方法适用于环境温度范围5 °C至50 °C，湿球温度不低于1 °C，环境压力与标准大气压力相差不超过30 %. 1.4 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.5 警告- 汞已被许多监管机构指定为可导致严重医疗问题的危险物质。汞或其蒸汽已被证明对健康有害，对材料具有腐蚀性。处理汞和含汞产品时应谨慎。有关更多信息，请参阅适用的产品安全数据表（SDS）。用户应注意，法律可能禁止向您所在的州或国家销售汞和/或含汞产品。 1.6 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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 （有关更具体的安全预防说明，请参阅 8.1 和 15.1 .) 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本试验方法的目的是为湿度计的构造和准确测量大气湿度所需的技术提供指南。仅规定了湿度计的基本功能。

1.1 General: 1.1.1 This test method covers the determination of the humidity of atmospheric air by means of wet- and dry-bulb temperature readings. 1.1.2 This test method is applicable for meteorological measurements at the earth's surface, for the purpose of the testing of materials, and for the determination of the relative humidity of most standard atmospheres and test atmospheres. 1.1.3 This test method is also applicable when the temperature of the wet bulb only is required. In this case, the instrument comprises a wet-bulb thermometer only. 1.1.4 Relative humidity (RH) does not denote a unit. Uncertainties in the relative humidity are expressed in the form RH ± rh %, which means that the relative humidity is expected to lie in the range ( RH − rh ) % to ( RH + rh ) %, where RH is the observed relative humidity. All uncertainties are at the 95 % confidence level. 1.2 Method A— Psychrometer Ventilated by Aspiration: 1.2.1 This method incorporates the psychrometer ventilated by aspiration. The aspirated psychrometer is more accurate than the sling (whirling) psychrometer (see Method B), and it offers advantages in regard to the space which it requires, the possibility of using alternative types of thermometers (for example, electrical), easier shielding of thermometer bulbs from extraneous radiation, accidental breakage, and convenience. 1.2.2 This method is applicable within the ambient temperature range 5 °C to 80 °C, wet-bulb temperatures not lower than 1 °C, and restricted to ambient pressures not differing from standard atmospheric pressure by more than 30 %. 1.3 Method B— Psychrometer Ventilated by Whirling (Sling Psychrometer): 1.3.1 This method incorporates the psychrometer ventilated by whirling (sling psychrometer). 1.3.2 This method is applicable within the ambient temperature range 5 °C to 50 °C, wet-bulb temperatures not lower than 1 °C and restricted to ambient pressures not differing from standard atmospheric pressure by more than 30 %. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 Warning— Mercury has been designated by many regulatory agencies as a hazardous material that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law. 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. (For more specific safety precautionary statements, see 8.1 and 15.1 .) 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 ====== 5.1 The object of this test method is to provide guidelines for the construction of a psychrometer and the techniques required for accurately measuring the humidity in the atmosphere. Only the essential features of the psychrometer are specified.