themis instrument fm2/fm3 perenvironments- 1 teleconference 8/30/2005 themis instrument fm2/3...

THEMIS Instrument FM2/FM3 PER Environments-1 Teleconference 8/30/2005

THEMISInstrument FM2/3

Pre-Environmental Review Environments

Jeremy McCauley

University of California - Berkeley


F2-3 Suite I&T Flow

Suite SC Test12,25JUL2005

Suite Phasing

Test

Inst.Delivery

AXB SPB SST

SuiteThermal

8-14SEP2005

Suite Delivery

• 6 cycles T-V• EFI Functional (Level 1)

Suite PER30AUG2005

INSTRUMENT PERs

INSTRUMENT TESTING

SUITE INTEGRATION

SUITE DELIVERY

IDPU/SUITE ENVIRONMENTS

FGM/SCM

Inst.Thermal

Inst. Vibration

Suite STM

IDPU/ESAVibration

30AUG2005,1SEP2005

IDPU/ESAThermal

2-6SEP2005• 2 cycles T-V• Bake-out +60C

SuiteTest Review

Bus INTMagneticScreening


IDPU+ESA Vibe TestingVibration Plan • 3-Axis, Sine and Random to Acceptance Levels• Details contained in THM-ESA-PRC-007, THEMIS ESA + IDPU Acceptance

Vibration Test Procedure , Rev. A (unchanged from F1)


Magnetic TestingMagnetic Screening Plan • Box level screening• Deperm with 40Grms, Map with 2 axis rotation of unit within coil system• Details contained in THM-MINT-PROC-121, THEMIS Component Magnetic Test Procedure


Thermal Testing Outline

Cycle Accumulation• 2 cycles at instrument level - constrained by schedule• 6 cycles at instrument suite level• 4 cycles at spacecraft level• 12 cycles total for every flight instrument• 4 hour soaks at hot and cold targets• Every TVAC test is preceded by a PER where thermal

engineer signs off on procedure

Thermal Balance• Done on one flight or flight like unit only at the instrument

level• Instrument level balance verifies conductance, absorptance,

and emittance properties• Instrument thermal design is verified at the probe level on

P1


TV Plan • 2 Component-Level TV Cycles Prior to Suite Level I&T

• Survival, Cold Start and Bake-out (TQCM Monitor)

• Details contained in THM-ESA-PRC-0016, THEMIS ESA + IDPU Thermal Vacuum Test Procedure, Rev. 2.0 (unchanged from F1)

ESA (TC 5)

Platen #2 (TC 21)

Platen #1 (TC 20) IDPU (TC 10)

IDPU (TC 9)

IDPU/ESA TV Testing


ESA/IDPU Thermal Testing Status

• F1 IDPU needs to be retested after rework


FGM Thermal Testing Status

• F4 FGS was not conductively mounted correctly in first qualification test. Retest was done in air at limits shown

• No changes since F1 PER


SCM Thermal Testing Status

• Thin crack in the potting for two antennas during first ETU test. Potting method reworked and retested



SCM/FGM Boom Thermal Testing Status

• F1 booms re-named F6 after anomalous vibration results

• F1 SCM and FGM will get a total of 4 cycles at the instrument suite level instead of the normal 8 due to the swap of F1 and F6

• F1/F2 retested twice due to test setup errors


SST Thermal Testing Status

• Some ITO coated silver Teflon thermal control tape with 9703 conductive adhesive from the STEREO project was thermal vac tested separately and it passed conductance and adhesion tests

• THEMIS tape was tested after it arrived and it failed. We reworked the application method and retested and the tape passed. Further testing planned.

• F3 renamed F4 and F4 renamed F3• All units need to be retested following mezzanine board rework


EFI PreAmp Thermal Testing Status

• ETU 1 Preamp had no problems but FR4 board was switched to Thermount 85 NT for ETU 2 and flight

• Six ETU 2 Qual Units went through 24 cycles, Two of those units added an additional 14 cycles for a total of 38

• Upper limit recently changed from 65 to 90 in September 04 due to receipt of optical testing data on DAG 213.



EFI PreAmp Thermal Testing Setup


EFI SPB Thermal Testing Status

• Qual ETU motor was a motor only stress test, no problems seen• SPB design changed from flying with doors closed to flying with doors open. ETU was

retested after the small modifications this required• Calibration runs done with the sphere keyreels to determine release tension at hot and

cold deployment conditions• SPB unit has completed thermal balance testing• No changes since F1 PER


EFI AXB Thermal Testing Status

• Due to delivery schedules to Swales we were unable to include the AXBs in the suite testing. They accumulated the 6 suite cycles on their own

• All testing completed except balance test


Suite TV TestingTV Plan • F2 and F3 Suites Together• 6 Suite Level TV Cycles, Survival, Cold Start and Bake-out (TQCM Monitor)• Details contained in THM-SYS-PRC-004, THEMIS INSTRUMENT SUITE

Thermal Vacuum Test Procedure , Rev. B (unchanged from F1)

Suite Thermal Vac Cycle

-75

-55

-35

-15

5

25

45

65

0 8 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128 136

Hours

Tem

pera

ture

(C)

LPT LPT LPT LPT LPT LPT LPT

SURVIVAL

LPT LPT LPT LPT LPT

LPT LPT


Instrument Suite Thermal Testing Status

• Due to an error F1 Suite did not go to the cold survival temperature before turn on. All units have separately been turned on at their cold survival limit.

• F2-F5 will be tested to the –60 survival temperature

themis instrument fm2/fm3 perenvironments- 1 teleconference 8/30/2005 themis instrument fm2/3...

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