规定了通用光电曝光仪的校准水平和测试条件，用于测量反射光或入射光，或两者，以确定相机使用的摄影曝光。本规范适用于包含光敏元件、指示电气仪表、定向系统和计算器的曝光计，以将仪表指示与相机曝光设置相关联。

Specified are calibration levels and test conditions for general-purpose photoelectric exposure meters which measure reflected or incident light, or both, in determining photographic exposure for camera use. The specifications apply to exposure meters containing a light-sensitive element, and indicating electrical instrument, a directional system and a calculator to correlate the meter indications with the camera exposure settings.