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Firstly, there was the testing of the Service Module and, secondly, the testing of the Payload Module (PLM). This paper discusses the thermal balance testing of the PLM. The PLM, itself, is 7.5 metres tall; too large to fit into a test facility solar beam. ...The Envisat PLM supports a complement of 10 earth observation instruments and was successfully tested in July/August 1999 at the Large Space Simulator (LSS), at ESTEC, The Netherlands.

The first test was for the Service Module (SM) and the second for the Payload Module (PLM). This paper discusses the thermal balance testing and subsequent correlation of the Polar Platform Service Module thermal mathematical model.