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中文摘要: 通过对聚焦式日照计、暗筒式日照计与直射表测日照，进行对比观测与测试。得出聚焦式日照计阈值为120W·m-2左右，WMO定为IRSR(暂定标准日照计)是正确的。暗筒式日照计记录比它偏少5%左右，主要差在日出、日落时段，基本满足业务使用。直射表做为检定日照阈值的标准器，如用做日照的传感器，必须克服其跟踪太阳的偏差，否则准确度很难达到要求。
中文关键词: 日照，聚焦日照计，暗筒日照计，直射表
Abstract:By comparing the test between Campbell-Stokes,Jordan sunshine recorder and pyrheliometer,the threshold value of Campbell-Stokes sunshine recorder is 120W·m-2or so.IRSR which is defined by WMO is right.The record of Jordan is 5% less than that of Campbell-Stokes and most of this error appear at sunrise or sunset.In the main,Jordan is suitable for routine observations.Pyrheliometer can be used as standard of threshold value.If the deviation of tracking sun is overcome,it can be used as a sunshine sensor,or the accuracy is hard to meet the demands.
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引用文本：
张纬敏,谭月香,2000.日照计测量误差探讨[J].气象,26(5):17-19.
,2000.Approach Error of Sunshine Recorder[J].Meteor Mon,26(5):17-19.
张纬敏,谭月香,2000.日照计测量误差探讨[J].气象,26(5):17-19.
,2000.Approach Error of Sunshine Recorder[J].Meteor Mon,26(5):17-19.