Happy
Holidays
SORCE
Mission Status November December 2001
Major SORCE Mission accomplishments during the month of November
2001 include the completion of the SOLSTICE instrument A/B
SURF calibrations, SOLSTICE A/B shake, replacement of GCI
(Generic Channel Interface) parts and the testing of the SORCE
Integrated Instrument Module in the MOBI Thermal Vacuum Chamber.
SORCE continues to closely monitor and adjust schedules for
instrument fabrication to respond to changing priorities and
facilities availability during fabrication and test. SORCE
instrument delivery is now trailing the delivery of the SORCE
spacecraft bus that is currently two months behind schedule.
A potential launch delay may be requested.
SORCE System Status
The SORCE Integrated Thermal Analysis is complete. Preliminary
SORCE IM Thermal Analysis results revealed some slightly unexpected
results, but all readings are within operating parameters.
In the area of SORCE contamination control initial pump rates
from the IM (Instrument Module) in the LASP MOBI chamber indicated
that the integrated IM is very clean. TQCM (Total Quartz Crystal
Microbalance) have been used for the SORCE IM thermal vacuum
test. TIM and SIM vibration tests have been done and retesting
continues. Efforts to wrap up the SORCE RTM (Requirement Traceability
Matrix) are underway. The SORCE Instrument Module flight harness
has been wrapped and baked out.
The SORCE IM underwent a hardware stress/acceptance test in
the LASP MOBI chamber. SORCE power, mass and memory budgets
are now based on actual measured
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values and retain healthy margins. The
focus of the SORCE Electrical System during November has
been the MU (Microprocessor Unit). The SORCE MU Engineering
Model is functional and consists of an EM (Engineer
SORCE
Instrument module harness (above)
SORCE
Upgraded MOBI Vacuum Chamber (below)
Engineering
Model) RAD6000 computer, an EM PCI/IO, and EM Power Card
and an EM LVPC (Low Voltage Power Center). Currently, the
flight model EM RAD 6000 computer is under repair and the
power card needs further test. The flight MU has just finished
thermal cycle test and anomalies are being resolved. The
hardware versus software disposition is the principle focus
of anomaly resolution. In addition, an inrush current transient
occurs on the MU LVPC. The problem was traced to the Interpoint
DC/DC power converters on the LVPC. A filter circuit was
added on the power converter to correct the situation. Testing
indicates that the transient has been eliminated. More test,
characterization and qualification time is required. The
MU GCI's have been repaired with replacement diodes:
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