GLAST LAT ProjectMonthly Review, May 24, 2005 4.1.7 DAQ & FSWV1 1 GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software W.B.S 4.1.7.

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GLAST Large Area Telescope:

GLAST Large Area Telescope:

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EPU load – same as SIU load except…

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GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 1 GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software W.B.S May Monthly Review Gunther Haller (650) Gamma-ray Large Area Space Telescope

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 2 TEM/TPS Status & Schedule Status –Qual unit used for FM CAL testing was sent back to SLAC (to be discussed what do with it) –A & B at I&T on tower A and B –#1 & #2 delivered to I&T –#3: unit with bad Tem connector (is currently in TV) –#4: currently in TV, coming out Wednesday –#5: was delivered to SLAC last week, needs vib/TV/EMI –#6: expected to be delivered at SLAC today, needs vibTV/EMI –Next 2 sets expected in 2 weeks (cause is TPS pipe-line) –Rest of module: 2/week thereafter –Did find fix for low-level oscillations, exchange of one resistor, but not clear whether it is worth at this time to incorporate mods.

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 3 PDU Status and Schedule Schedule for 2 units –Proto-flight, pre-coat, arrived at SLAC 5/10 –Was schedule to go back 5/24, but is delayed a few days Power-outage (mainly software access and un-stable power) Box needed some machining to prevent a short of a node to ground –Testing at room-temperature ok, still needs testing over T before shipping it back to assembler for conformal coating –Deliver proto-flight to I&T 8/1 in present assembler schedule –2 nd unit lags by 6 weeks

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 4 GASU Status and Schedule Status –Surface-mount assembly complete –Is in flying-probe testing Schedule for 2 units (from assembler) –6/21: proto-flight unit assembled, pre-coat, ready for test at SLAC –6/28: ship to SLAC for environmental testing –9/3: deliver proto-flight unit to I&T –2 nd unit lags first by 6 weeks

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 5 SIU/EPU Status and Schedule Status –Backplane solder testing sample of new flight board (with reduced copper) was analyzed at GSFC Minor issues which are being addressed –Solder Sample of SIB was delivered to GSFC last Friday, is being analyzed –SIB/LCB/CPS/CBP board parts kits shipped Discovered that one part (UTMC LVDS receiver) was ordered short No impact to schedule since we are able to buy parts (assuming Po is placed in the next 2 days) Cost impact since those were not budgeted and have also higher screening level –Sib parts audited at assembler, engineering masters received, scheduled to go to surface mount assembly this week –Issue with SIB Austin EEPROM of the lot we are assembly this week No helium-tracer gas was put into re-sealed parts (not clear yet how many of our parts are affected) Chlorine traces detected in capacitor die attach (might only be for extended bake-out parts, under investigation) New lot to get additional parts beyond parts being loaded above )for different lot which was rejected) passed source-inspection, expected 3 rd week of June –Part kits of other parts are at assembler audit stage –All blank PC boards are a t assembler with exception of CPS (was received and is in coupon testing) Schedule –Boards for integration of first 5 crates should be at SLAC Aug 28 according to assembler schedule –1 week per crate for vib/TV/EMI thereafter

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 6 Harness & heater Contol Box Harness in assembly Received several types of cable assemblies, more coming in Heater Control box PCB’s received (are in coupon testing) Assembly contract requisition is in purchasing

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 7 EGSE

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 8 Thermo-testing support Status –Power protection unit for regulated and unregulated feeds in assembly (done by end of this week) –PDU/GASU/SIU ready to be mounted in rack –AC power distribution unit to be delivered to SLAC this week –Flight software changed code to provide hooks for LATTE4 Still needs to be more debugged –LATTE4/FSW code in progress (lost 3 days last week)

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 9 VSC Science Interface GPS receiver systran board (removed) SBC 1553 interface (removed) to GASU First VSC done –In use by FSW and I&T (Ric) Other 3 stations being put together (next 3 weeks)

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 10 Tech Issues Larger TPS ripple issue resolved, potentially have small ripple at certain loads/voltage settings (could also be removed with resistor change, to be decided) AUSTIN EEPROM DPA problems –New lot delivery date 6/16 (just passed CSI) these parts are needed to replace a rejected lot –New issue (GIDEP alert) on lot in hand, is being addressed Qualification of cCPI press-fit connector assembly using solder process –Looks promising Need to work on closing open FPGA review items

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 11 Level 3 Milestone Count

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 12 Level 3 Milestone List

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 13 Level 3 Milestone List

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 14 Level 3 Milestone List

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 15 Level 3 Milestone List

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 16 Milestone Variance Explanation PDU/GASU/SIU modules later than planned, assembly vendor started late Change plans to use proto-flight unit for I&T unless assembler can speed up work

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 17 Cost Report

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 18 Cost Variance Explanation In process of examining schedule/cost variances. Looks like schedule variance can be mitigated some, but needs more works

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 19 FTE Report (DOE/NASA-funded only)

GLAST LAT ProjectMonthly Review, May 24, DAQ & FSWV1 20 FTE Variance Explanation Ramped down some, but not fast enough. Need more (paid) labor than planned to watch thermal-vacuum chamber