指定两种首选方法:室外校准（日射强度计处于水平位置、倾斜位置或垂直入射）和室内校准（使用带阴影或无阴影灯的积分球，或垂直入射）。适用于大多数类型的野外日射强度计，无论采用哪种辐射受体。

Specifies two preferred methods: the outdoor calibration (with the pyranometer in a horizontal position, in a tilted position, or at normal incidence) and the indoor calibration (using an integrating sphere with shaded or unshaded lamp, or at normal incidence). Applicable to most types of field pyranometers regardless of the type of radiation receptor employed.