GIST 24 Meeting GERB Hardware Status 14 th December 2005 Eric Sawyer

GERB 1 on MSG 2 Final activities in Kourou Application of conductive paint to the solar reflector tiles Conductivity requirement was not met, discovered on GERB-4

GERB-3 In storage at RAL Some updates to the IEU to be completed

GERB-4 Instrument Optical Unit (IOU) Fold Mirror and FM1 Detector integrated and aligned to Telescope Assembly Telescope boresight aligned to De-scan Mechanism Telescope boresight pointing relative to the alignment prism measured Telescope Cover Assembly & DSM Cover Assembly integrated Calmon assembly complete Front Panel assembled Heaters and temperatures sensors integrated and harness routed to external connectors MLI blankets fabricated QFM and DSM operated with IEU prior to integration into IOU IOU functional test with GERB-4 IEU expected this week.

GERB-4 Instrument Electronic Unit (IEU) & Inter-Unit Harness (IUH) Modifications to the Timing, Inductosyn and Vector Control 1 Boards now complete (to rectify the problem of variable timing between SOE and SOL pulses). All PCBs have been tested at board level All PCBs conformally coated and baked-out IEU completely assembled and checked at unit level IEU ready to start functional checks with the IOU IUH completed and baked out

GERB-4 Plans for next few weeks Complete functional testing of IEU and IOU Characterisation of Scan Mirror positions to viewing aperture, Black Body aperture, etc. Manufacture tapered shims Vibrate IEU Vibrate IOU Thermal vacuum test of complete instrument Electrical interface checks Delivery to Alcatel Space expected 17 th January 2006.