# Presentation: 071730

## ALI Agenda

***ALI Agenda***

***STM (Structural Thermal Model) Testing/Qualification***
***ALI Flight Instrument Testing/Qualification***
***Design Changes since ALI PER, 8/5/98***
***Anomalies During Testing/Qualification***
***ALI Readiness for T & E***

## ALI STM Testing/Qualification

***ALI STM Testing/Qualification***

***Sine Burst Vibration at Qualification Level***
***Sine Sweep Vibration at Qualification Level***
***Random Vibration at Qualification Level***
***Thermal Balance***
***Alignment***
***Magnetic Characterization (GSFC) ***
***EMI/EMC, Exceeded Radiated spec @ discrete frequencies from 2 to 250 MHz***

## ALI Flight Instrument Testing/Qualification

***ALI Flight Instrument Testing/Qualification***

***Sine Sweep Vibration at Protoflight Level***
***Random Vibration at Protoflight Level***
***Thermal Vacuum Hot and Cold survival Cycle***
***Thermal Vacuum/Cycle***
***Calibration***
***Alignment***
***Aliveness/Functional/Performance ***

## ALI Instrument Design Changes Since ALI PER, 8/5/98

***ALI Instrument Design Changes Since ALI PER, 8/5/98***

***Change:***
*ALICE radiator was eliminated and ALICE was heat-sunk to the pallet through a thermal conduction bar prior to beginning environmental testing*
***Reason:***
*The ALICE radiator was blocked by the Hyperion instrument *
***Action:***
*Conduction bar is held in place via a tongue inserted between ALICE and the pallet and the existing bolts. Thermal RTV was applied between ALICE-conduction bar and pallet-conduction bar.*
***Result of the Modification:***
*TV test verified that ALICE temperature range is within desired  limits. Modification successful*

## ALI Instrument Design Changes Since ALI PER, 8/5/98

***ALI Instrument Design Changes Since ALI PER, 8/5/98***

***Change:***
*New focal plane thermal control system implemented  in ALICE (ALI Control Electronics) software*
***Reason:***
*The focal plane thermal control system did not operate properly due to interference from the science data *
***Action:***
*New system controls heaters to stabilize the focal plane temperature prior to science data period. Earlier thermal control system is deactivated during science data transmission*
***Result of the Modification:***
*Focal plane temperature and science data stable during data period. Modification successful*

## Change:
Added focal plane heater to be used for out-gassing, if necessary
Reason:
Contaminate found on focal plane during calibration that could be removed by heating during vacuum. Out-gas heater can be used for on-orbit out-gassing
Action:
New heater added to focal plane. New heater was wired to ALI redundant survival heater power service. Primary and redundant heaters wired to same power service.  
Result of the Modification:
All heater systems have been TV tested. Modification successful

***Change:***
*Added focal plane heater to be used for out-gassing, if necessary*
***Reason:***
*Contaminate found on focal plane during calibration that could be removed by heating during vacuum. Out-gas heater can be used for on-orbit out-gassing*
***Action:***
*New heater added to focal plane. New heater was wired to ALI redundant survival heater power service. Primary and redundant heaters wired to same power service.  *
***Result of the Modification:***
*All heater systems have been TV tested. Modification successful*

***ALI Instrument Design Changes Since ALI PER, 8/5/98***

## ALI Instrument Anomalies During Testing / Qualification

***ALI Instrument Anomalies During Testing / Qualification***

***Anomaly:***
*During EMI/EMC testing of STM radiated narrow band emissions exceeded specification*
***Resolution:***
*Filter box added to flight instrument ALICE box. Filter box design has been reviewed by GSFC. No problems expected. Flight instrument to be EMI/EMC tested at spacecraft level. Waiver granted for STM.*
***Pending action:***
*Spacecraft level EMI/EMC test to be performed and results evaluated. *

## Anomaly:
Condensable material deposited on focal plane filters during calibration
Resolution:
Material removed by out gassing focal plane with aperture door open.  Focal plane out gas heater added to design. Heater vacuum tested under predicted on-orbit worst case (cold) thermal conditions. 
Pending action:
None. Design change meets requirements. 

***Anomaly:***
*Condensable material deposited on focal plane filters during calibration*
***Resolution:***
*Material removed by out gassing focal plane with aperture door open.  Focal plane out gas heater added to design. Heater vacuum tested under predicted on-orbit worst case (cold) thermal conditions. *
***Pending action:***
*None. Design change meets requirements. *

***ALI Instrument Anomalies During Testing / Qualification***

## ALI Instrument Anomalies During Testing / Qualification

***ALI Instrument Anomalies During Testing / Qualification***

***Anomaly:***
*Low resistance between LSB**** ****(Least Significant Bit) signal line and chassis ground found during ALI/WARP integration, 165 Ohms vs >1 M Ohm requirement), 4/19/99*
***Resolution:***
*Problem found to be in the IC containing four differential output drivers. The IC (Harris HS-26C31RH-Q) was replaced on 5/18/99. Integration and Functional/Performance tests ran following replacement. *
***Pending action:***
*None. Post rework tests verified design performance. *

## ALI Instrument Readiness for Test & Evaluation

***ALI Instrument Readiness for Test & Evaluation***

***The ALI has been environmentally tested and calibrated at the instrument level***
***The ALI instrument has passed all pre spacecraft level testing except  the STM EMI/EMC test. EMI/EMC compliance will be verified at the S/C test***
***The ALI instrument is ready for S/C T & E ***