本技术报告讨论了摄影标准化中用作湿度计和湿度计的设备 湿度计用于测量和控制试验室和储存区域的相对湿度（RH）。特殊的 注意摄影标准规定将相对湿度控制在u2%相对湿度或 较好的 建议使用电湿度计，因为其精度高、成本低、校准准确。 可由供应商或内部通过露点测量进行校准。在预算允许的情况下， 露点结合环境温度测量（转换为相对湿度）可能是唯一的选择 传感器系统。

This Technical Report discusses devices in photographic standardization that are used as hygrometers and humidistats in the measurement and control of relative humidity (RH) in test chambers and storage areas. Special attention is given to situations where a photographic standard specifies controlling relative humidity to _ 2 % RH or better. Electric hygrometers are recommended for their precision, low cost, and accuracy when properly calibrated. Calibration can be done either by the vendor or in-house by a dew-point measurement. Where the budget permits, dew-point combined with ambient temperature measurements (converted to relative humidity) may be the only sensor system.