Earth radiation measurement(ERM) nonscanner,which includes a total-wave channel and a short-wave channel,is a new type of remote sensing instrument in our country.There is an activity cavity detector in each of these channels.ERM nonscanner is used to stare the earth and measures the earth radiation budget from the low orbit satellite and its field of view covers with the edge of the earth.Being a quantification remote sensor,ERM needs a high precision radiant calibration standard.The method of radiant cali...