The Design and Testing of the ISO-Payload Module

The ISO-satellite consists of a Service and a Payload Module (PLM), the latter being essentially made up of the Cryostat. The paper describes essentially the hardware status of the PLM-flight model as it is delivered for final satellite integration and acceptance testing before flight. The various test activities and essential results obtained during development, qualification and PLM-flight model acceptance up to delivery to ESTEC are summarized.