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PACS.FM.IST: Integrated Satellite Level Tests

This document provides an overview of the PACS.FM.IST baseline documents, test flow, relevant changes, and the relation to ILT and commissioning. It also includes an overview of the PACS unit functional tests and short functional tests.

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PACS.FM.IST: Integrated Satellite Level Tests

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  1. PACS FM Tests at Integrated Satellite LevelH. Feuchtgruberwith inputs from the PACS Operations Team:D. Cesarsky, H. Dannerbauer, T. Müller, P. Royer, B. Vandenbussche, R. Vavrek FM IST

  2. Baseline Documents • IID-A & IID-B • HP-2-ASED-PL-0031, Issue 2, 3-Sep-04, “Instrument Testing on • PLM PFM and Satellite Level” • HP-2-ASED-TN-0115, Issue 1, 1-Feb-05, “Thermal Environment for • Instrument Testing on Ground” • SCI-PT-12759, issue 3, 2-Jun-04, “Reference Mission Scenario” • Set of Straylight related documentation • PACS-ME-TP-021, Issue 1.1, 6-Sep-05, “PACS Integrated Module • Test Procedure” • PACS-ME-TP-017, Issue 1.3, 17-Nov-05, “PACS Short Functional Test • Warm & Cold” • PACS-ME-TP-016, Issue 1.3, 19-May-05, “Test Procedure for PACS • WE Tests with PACS EGSE and CCS” FM IST

  3. FM Test Flow Contains IST3 FM IST

  4. FM IST

  5. IST relevant changes EQM  PFM • Power supplies are flight standard (in-rush current, consumption) • Redundancy (increased test volume) • Complete Ge:Ga and Bolometer detector arrays, new generation • of FEEs (increased number of commands  longer test durations) • Detector Heater & Flasher for Ge:Ga Curing (additional tests) • Larger grating angle range (slightly longer test durations) • Larger chopper angle range (slightly longer test durations) • Filter wheel SPEC (additional tests, longer test durations) • New generation of OBSW for DPU, SPU-S, SPU-L and DMC • New DPU boot software • New MIB (new commands, changed HK packet contents, x2 for • redundancy) • Lessons learnt: - improved background measurements • - improved thermal behaviour tests • - general test script adaptations FM IST

  6. IST Relation to ILT & Commissioning • At present: The starting point for all test definitions are the activities carried out during PACS CQM ILT and EQM IMT. • Changes to the EQM IMT program are due to FM hardware/software differences and lessons learnt. • The final versions of the tests will be for the first time run in FM ILT: • SFT warm, HeI, HeII • FFT, SPT-SPEC, SPT-PHOT • AOT tests • Redundant PACS instrument performances (as far as time allows) • Parallel mode: PACS part only • PACS ILT specific test/calibration programme (ILT only) • Activities (1)-(5) to be carried out at all test phases (ILT, IST1, TV/TB, IST2, IST3) and finally in flight. The test sequences will allow to judge about the health of the instrument and its sub-systems and whether ILT functional performances are preserved (i.e. we do not attempt to make absolute measurements, but only relative ones) FM IST

  7. Differences and Notes with respect to ILT • During ILT we will not run the test via a MTL (we may encounter • TC timing or synchronisation problems) • All provided test durations hereafter are expressed as execution time in the terminology of CUS “modes” (not “obs” !!) • From EQM IMT experience we need to take into account also (TBD) overheads. • Running a test entirely from the MTL will require some more thoughts on how to arrange for a suitable “near real time analysis” (if any ?) • and properly tested command sequences. • We have to learn how to handle (i.e. process and analyse) a SSMM dump FM IST

  8. Top Level Structure of IST • UFT: Basic warm electronics test prior to connection to the FPU • SFT warm, HeI and HeII: Basic verification of all PACS subsystems • after each significant integration/handling step. • IST Commissioning: • “This sequence shall verify the ability to the instrument commissioning and performance verification operations” • IST Reference Mission Scenario: • “The objective of this sequence is to exercise 48h of representative operations, including the non visibility phase. This especially comprises the scientific instrument operations.” • IST Special Performance Test: • “Comprises all remaining test.” • EMC Tests: Conducted Emission (most noisy mode), Radiated Emission (most noisy mode), Radiated Susceptibility (most sensitive mode) • TV/TB Tests: Reduced IST test program • PACS/SPIRE parallel mode tests: part of IST Commisioning FM IST

  9. FM IST Cryostat Environment Closed ! (drifting) Tilt may affect Red Ge:Ga strap Full FM IST

  10. FM TV/TB Cryostat Environment Tilt may affect Red Ge:Ga strap Empty FM IST

  11. In-Flight Cryostat Environment Empty FM IST

  12. Overview of PACS Unit Functional Tests • Configuration: • - PACS warm electronics mounted SVM panel • - WIH connected • - Electrical checks done as part of the integration procedure • (a) with I-EGSE (28V power, CDMS sim., OBT sim.) • (b) with CCS • Test procedure PACS-ME-TP-016, issue 1.4: • - Switch-on • - Simulated Spectroscopy mode (DMC ramp simulation) • - Simulated Photometry mode (BOLC test pattern) • - Switch-off FM IST

  13. Overview of PACS Short Functional Tests • SFT warm, HeI, He II (nominal) : Duration ~1.2h each • SFT warm, HeI, HeII (redundant) : Duration ~1.2h each • Contents: (differences warm - HeI - HeII just in some parameter values) • - Switch-on ( = OFF – SAFE transition) • - Basic chopper moves • - Optional launch-lock open / close steps • - Open loop / closed loop simple grating moves • - Calibration sources, simple check (no stabilisation) • - Heater/Flashers: simple check of currents (new) • - Filter wheel Phot: 3 full turns • - Filter wheel Spec: 3 full turns • - T- Sensors: plausibility check • - Ge:Ga detector chain: mainly dummy resistor check • - Cooler: check if heater currents can be applied (T-response) • - Bolometer detector chain: bias staircase pattern • - Switch-off FM IST

  14. IST Commissioning: PACS • Full Functional Test (FFT) at HeII conditions: total time: ~10.6h • Contents: - Switch-on (OFF – SAFE Transition) 0.1h • - Memory Management Test 0.1h  • - SetupSpectroscopyCSoff (+Llock open) 0.3h • - Grating Test 0.2h • - Thermal behaviour SPEC ~1.5h • - Ge:Ga heater 0.3h • - Ge:Ga flasher 0.25h • - SetupSpectroscopy, FW SPEC, data rates ~2h? < • and background adjustment • - Chopper full FoV move 0.3h • - Medium sampling grating scan (2 filters) 1.0h • - Cooler recycling 2.2h • - Thermal behaviour PHOT ~1.5h • - SetupPhotometry, FW PHOT, data rates 0.6h • - Bolometers saturation check 0.1h • - Switch-off Some inter-step dependencies FM IST

  15. IST Commissioning: PACS/SPIRE Parallel • Repeat same procedure as for EQM IMT • (PACS-ME-TP-024, issue 1.2, 3-Nov-05) • Total execution time: ~6.75 h • Content (PACS part): • - Shifted cooler recycling • - Setup photometry • - Single band photometry AOT (red channel only) • - Dual band photometry AOT (red + double reduced blue channel) • Status of scripts and procedure for IST: • - SPIRE part requires slight updates • - PACS part requires slight updates • - No simultaneous CUS scripts possible yet!, but … • Precise definition of parallel mode as “4th Instrument” in progress FM IST

  16. IST Reference Mission Scenario: PACS FM IST

  17. IST Special Performance Test: PACS • SPT at HeII, SPEC: total time: ~8.4h • Contents: - Ge:Ga dark currents on internal CSs (cold) 0.65h • - Grating performance test (full diagnostic 0.55h • monitoring, exploration of stepping • performances on full accessible range) • - Chopper performance test (duty cycle at 0.2h • different frequencies, OBCP sync.) • - Emissivity of internal CSs (2.3)0.75h • - Quick Wavelength check 0.3h • - Grating RSRF 3.1h • - S/N as function of reset interval 0.25h • - Different bias settings for Ge:Ga detectors 0.3h • - Test of internal calibration recipes SPEC (0.65)0h • - Time constants for flux changes spectroscopy 0.5h • - Internal CSs performance test 1.1h • - Detector selection table test SPEC 0.3h  • - SPU compression/reduction test 0.25h  Some inter-step dependencies FM IST

  18. IST Special Performance Test: PACS • SPT at HeII, PHOT: total time: ~6.7h • Contents: - Cooler recycling 2.2h ? • - SetupPhotometry 0.6h • - Test of internal calibration recipes PHOT 0.6h • - Focal plane map with CSs and representative (0.2)0.7h • background (updated see HP-2-ASED-SD-0064) • - Staring measurement on CS for low 1.5h • frequency noise • - Time constants for flux changes photometry 0.5h • - Detector selection table test PHOT 0.1h  • - SPU compression/reduction test PHOT 0.25h  • - Test pattern photometry 0.1h  Some inter-step dependencies FM IST

  19. IST Special Performance Test: PACS • AOT Tests: (redefined based on lessons learnt + curing; some • analysis still ongoing; total time: ~8.2h) • Contents: - Switch-on 0.1h • - Cooler recycling 2.2h • - SetupPhotometry 0.6h • - “TuttiFrutti” AOT test PHOT 0.5h • - PHOT AOT concepts (based on lessons ~1.0h • learnt: EQM IMT, FM ILT) • - Enter SAFE mode 0.1h • - SetupSpectroscopy 0.6h • - “TuttiFrutti” AOT test SPEC 0.5h • - SPEC AOT concepts (based on lessons ~2.0h • learnt: EQM IMT, FM ILT) • - Ge:Ga detector curing procedure 0.5h • - Enter SAFE mode 0.1h • - Switch off FM IST

  20. IST Special Performance Test: PACS • Test of redundant PACS instrument: (new for FM) • Ideally many FFT/SPT tests would require repetition with • redundant hardware. The concept below is a compromise • to save time. ( Only during ILT an attempt will be made to • properly characterize redundant hardware functional • performances.) Total time: ~4.8h • Proposal: - Switch-on (redundant) 0.1h • - Cooler recycling 2.2h • - SetupPhotometry (other controller params !) 0.6h • - Two/Three position chopping w/wo CSs 0.5h • - Enter SAFE mode 0.1h • - SetupSpectroscopy (other controller params!) 0.6h • - Line Scan AOT with variation of internal 0.6h • calibration concept • - Enter SAFE mode 0.1h • - Switch off (redundant) FM IST

  21. PACS EMC Testing during IST • PACS-ME-PL-015, issue 1.2, 10-Nov-04, EMC/ESD Control Plan and • Procedure: • - Contains description of “most noisy” modes (for CE and RE) • - Scripts have been written for similar overall strategy as for RS- • Tests: • a) configure for SPEC mode • b) configure “most noisy” mode • c) execute measurements • PACS-ME-TP-021, issue 1.1, 6-Sep-05, Sec. 8, EMC part of PACS • IMT Procedure • - Contains description of “most sensitive” modes (e.g. for RS-Tests) • HP-2-ASED-PR-0033, Sep-05, PLM EQM EMC Test Procedure • - List of frequencies for RS-Tests • Lessons learnt: Eventually modify RS-Test strategy to include pulsed • tests and review list of frequencies FM IST

  22. PACS TB/TV Testing • About TB/TV test from HP-2-ASED-PL-0031: • “A reduced IST sequence will be performed for the verification of the instruments functional performance” • “Shortened” IMT/IST procedure: total time ~41h • FFT (10.6h) • SPT-SPEC (8.4h) • SPT-PHOT (4.5h) without cooler recycling • AOT Test (6.0h) without cooler recycling • Redundant PACS Test (4.8h) • PACS/SPIRE Parallel Mode (6.75h) FM IST

  23. PACS AVM IST • Original purpose: “dry run = clear test procedures before going on FM” • Available PACS Hardware: • - DPU AVM 1/2 Boot SW has been upgraded to flight version • - SPU AVM, Boot SW flight representative • - DMC EM, Boot SW flight representative • - BOLC AVM + external power supply • Limitations with respect to FM: • - Cannot run FM OBSW (DMC FM has different hardware) • - Cannot run nominal IMT/IST procedures (no FPU and simulation • requires different commanding) • - No redundant systems • - No FM MIB • - Workaround solutions in analysis (mainly in OBSW) • Basic Functional Test for PACS WE according to PACS-ME-TP-016, • issue 1.3, section 5 (Duration 1h) FM IST

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