Advanced X-Ray Astrophysics Facility Instrument Cable Certification Bakeout Test
Final rept. May-Jul 1996
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
Pagination or Media Count:
The Advanced X-ray Astrophysics Facility - Imaging AXAF-I Instrument Cables Pre-bake and NASAMFSC 1238 SPEC Certification was conducted in the Arnold Engineering Development Center AEDC 4 x 10 Thermal Vacuum Chamber and 7V Antechamber, respectively. The flight hardware instrument cables provide the connections to the satellites sensors and on-board process modules. The instrument cables certified included coaxial, multi-conductor, thermal couple wires, BNC connectors, limit switches, and several other miscellaneous connector devices. The primary objective of this test project is to de-contaminatecertify cleanliness of the instrument cables developed under the NASA-MSFC AXAF-I program. The NASAMSFC 1238 Specification certification was performed in two steps. First, all cables were to be pre-baked at 200 deg F for a minimum of 72 hr and a maximum of 100 hr with a vacuum level of less that 1E-5 torr in AEDCs 4 x 10 Thermal Vacuum Chamber. Upon completion, the cables were placed in AEDCs 7V Antechamber and certified at 160 deg F with a vacuum level less than 1E-6 torr until TQCM obtained less than 1 Hzhr rate change for 12 hr and further exposing an Optical Witness Sample OWS for 24 hr. The cables were not considered certified until the OWS passed a contaminate reflection test at NASAMSFC. This report does not include all the data obtained during the tests but describes the particulars of each test phase and presents some typical results from each phase. The equipment used to accomplish the test objectives is also discussed. All the OWS from the test program were transported and certified by NASAMFSC Contamination Laboratory at the time of each cable certification completion.
- Electrical and Electronic Equipment
- Unmanned Spacecraft