1. GLAST LAT System Engineering
Gamma-ray Large Area Space Telescope
GLAST LAT System Engineering
LAT Test Planning Meeting
Rich Baun
SLAC
(650)

2. Agenda LAT Level Test Sequence Baseline LAT Level Test Sequence
Test Groupings
LAT Environmental Test Sequences
Redundancy Configurations

3. LAT Level Test Sequence
Baseline
Ship to NRL
Post-Ship
Modal Survey
Sine Vibe
Install Radiators
Post-Rad
Install
EMI/EMC
Acoustic F S F S P P P P T P E P F
Pre
Post Axis
Pre
Pre
Post
Pre-TV
T-Bal
T-Cycle
Final
Remove Radiators
Weight, CG
Pack LAT
Ship to GD F S F F S P F S
TV Chamber
Partial Functional (includes Limited Performance)
Full Functional (includes Comprehensive Performance)
EMI/EMC Emissions/Susceptibility
SVAC Tests
TCS LPT P F E S T

4. Baseline Level LAT Test Sequence
Basic Function Validation
Full
Functional
Initialization
Infrastructure
Tests
Register
Tests
Subsystem Response with LAT wide Functions
Abbreviated
CPTs
LPTs
LAT Characterization
Calibration
Initial Inst
Functional
Timing
Operational
Settings
LCI
SVAC Muons
LAT Performance
= Redundancy tests required
Baseline
Muons
E2E T&DF
Muon Tests
Full LAT
SVAC Tests

5. Baseline LAT Test - Test Groupings (1/4)
Basic Function Validation
Purpose
Initialization
Validate FSW conducted LAT initialization sequence
Prove FSW interfaces with flight hardware
Infrastructure
Validate all LAT operational functions such as command, telemetry, Configuration and LCI files, FSW File Management, et. al.
Register Tests
Utilize FSW utilities to verify function of all LAT registers

6. Baseline LAT Test - Test Groupings (2/4)
Subsystem Response
Purpose
Abbreviated Comprehensive Performance Test (CPTs)
Verify subsystem performance remains in spec in LAT wide environment
Demonstrate the complete health of each subsystem
Collect trend data
Run in all prime and all redundant redundancy configurations
Limited Performance Tests (LPTs)
Perform quick check of subsystem performance in cross-strapped redundancy configurations

7. Baseline LAT Test - Test Groupings (3/4)
LAT Characterization
Purpose
Initial Instrument Functional
High-level validation of the LAT as an integrated scientific instrument
Timing
Measure and adjust LAT wide timing
Calibration
Calibrate the LAT using LCI and Muons
Operational Settings
Determine/adjust LAT operational settings as precursor to LAT Level Performance tests

8. Baseline LAT Test - Test Groupings (4/4)
LAT Characterization
Purpose
Baseline Muons
Establish Instrument Level baseline performance with Muons
E2E Muon Tests
Verify T&DF performance using Muons
Full LAT SVAC Tests
Collect necessary data for analysis to verify LAT meets all requirements in the SRD

9. Post Ship Test Sequence
Basic Function Validation
Full
Functional
Initialization
Limited Infra
Tests
Register
Tests
Subsystem Response with LAT wide Functions
Abbreviated
CPTs
LPTs
LAT Characterization
Calibration
Initial Inst
Functional
Timing
Operational
Settings
LCI
SVAC Muons
LAT Performance
= Redundancy tests required
Baseline
Muons
E2E T&DF
Muon Tests
Full LAT
SVAC Tests

10. Sine Vibe LAT Level Test Sequence
Partial Functional
Basic Function Validation
Initialization
Limited Infra
Tests
Register
Tests
Subsystem Response with LAT wide Functions
Abbreviated
CPTs
LPTs
Partial Functional repeated 4 times, one pre Sine Vibe and once after each axis
= Redundancy tests required

11. Post Radiator Installation
TCS LPT
Contents TBD
= Redundancy tests required

12. EMI/EMC LAT Level Test Sequence
Partial Functional
Basic Function Validation
Initialization
Limited Infra
Tests
Register
Tests
Subsystem Response with LAT wide Functions
Abbreviated
CPTs
LPTs
EMI/EMC
RERS
CECS
= Redundancy tests required

13. LAT Level Test Function/Interface Validation (1/3)

14. LAT Level Test Function/Interface Validation (2/3)

15. LAT Level Test Function/Interface Validation (3/3)

16. LAT Level Redundancy Configurations

17. LAT Level Test - Interfaces Verified