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Gravity Probe B

Testing Einstein's Universe

WEEKLY HIGHLIGHTS FOR WEEK ENDING 10 October 1997:

STANFORD HIGHLIGHT
The EMI/EMC testing in GTU-2 is going well. The electronics configuration being tested includes the SRE engineering unit connected to one SQUID, two Rev. C SRE units each connected to a SQUID, and the TRE engineering unit connected to a low-temperature photodetector with the TRE being readout and commanded through the SRE engineering unit. We expect to complete the GTU-2 EMI testing next Wednesday, 10/15/97.

Performance testing of the first Science Mission SQUID package was completed, and it passed all of its performance tests. This SQUID package now needs to go through magnetics testing before it can be accepted.

The patterning of the readout loops for four Science Mission gyroscope housings (DQH42, DQH46, DQH50, and DQH58) has been completed this last week.

SPACE VEHICLE HIGHLIGHT
During the week ending October 3rd, the Mechanical Product Development Team completed source selection evaluation visits to vendors bidding on the fabrication of the Relativity Mission Mass Trim Mechanisms. Additionally, fibers were bonded into each of the Probe flight fiber optic cable connector housings. This is the primary bond for the fiber optic feed throughs from the inside to the outside of the Probe. The bonding went well and the cables will be ready next week for bonding of a stainless steel sleeve to protect the ceramic insulators and the start of thermal cycling. (Reeve, 4-5001)

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