Distribution Boards and FPU Harness Concept

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Distribution Boards and FPU Harness Concept

• R. Graue, D. Kampf
• Kayser-Threde

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Distribution Board Blue Detector
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Distribution Board Red Detector
Harness layout due to equal length of all
detector modules
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EM Breadboard
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Distribution Board Approved Design

• Rigid-flex boards
• Material
• PCB FR4
• Flexible Harness Polyimide
• Layout shall be designed according to CNES
  QFT/SP.0019
• Connectors Cannon MDM 3401029 01B .... FR139
• Capacitors WIMA MKS 6,8 micro Farad, 50 VDC, 30
  VAC
• Resistors RNC 55 according to ESA SCC 40001 001

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Distribution board test matrix
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Distribution Boards Functional Verification Plan

• Incoming inspection according to inhouse
  procedures
• Visual inspection (components, bonding points)
• Measuring machine
• Pin to pin continuity
• Insulation
• Cross talk ohmic resistance test
• PCB layout test against Gerber data (automated
  inspection protocol)

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Distribution Boards Functional Check Out Test
Plan on FPU level

• Functional tests (prior and after cold vibration
  tests and during He temperature tests)
• Complete detector chain operation required
• Detection of Photoconductor signals (tbd by MPE)
• Test operations controlled by COE (MPE-tbc)
• Validation of signals by MPE (determination of
  nominal Photoconductor operation)

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CQM Distribution Board Status - Completed Tasks
I Design, Documentation and Components

• PCB design completed
• Manufacturing data package completed
• ICD updated
• CQM components tested /screened/released by ESA
  (Resistors, capacitors, connectors)

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CQM Distribution Board Status - Completed Tasks
IAssembly

• EM Test board
• Manufactured
• Functional testing
• Cryogenic cycling test (LN2)
• Cryogenic vibration test (LHe) Cryo STM test
• CQM Boards
• PCBs Manufactured and under inspection (NCR wrt
  anomalies)
• PFM Boards
• PCBs Manufactured and under inspection (see CQM)

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Distribution Board Status Open Work and
Schedule

• CQM Boards
• Assembly
• Functional testing
• Cryogenic cycling test (LN2)
• Qualification testing of bookbinder fabrication
  technology
• Documentation (Inputs for DP)
• Distribution board delivery until 11.2003
• PFM Boards
• Asssembly and testing
• Capacitor screening and distribution board
  delivery until 7.2004

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Distribution Boards Cryo Qualification Test Matrix
Tests Planned Qualification Tests Performed BB Test Performed Cryo STM Test Comments
Ambient simplified Functional Test prior / after Cold Vibration Test X X - KT provided stand alone test
Cold Vibration Test (LN2 or He) (3 axes) X - X (He) MPE tests mounted in Cryo STM (FPU)
Thermal Cycling LN2 X X - KT shock tests with 10 cycles
Ambient functional tests after thermal cycling test (LN2) X X - KT tests
Thermal Vacuum Test (He) X X X MPE provided functional BB and CQM FPU tests
Functional Test at cryogenic temperatures (He) X X - BB test provided by MPE with performance characterization
? Distribution Boards are Cryo Vibration Qualified
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Distribution Board - Open Points

• PFM Capacitor screening (Updated procedure)
• Verification test plan of PCB bookbinder
  technology manufacturing procedure in progress
• Microscopic tests (e.g. cracks)
• Thermal tests
• Functional tests

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FPU Harness Architecture
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Harness CQM/PFM Procurement Status

• Harness designed and approved
• Manufacturing data package released
• CQM/PFM Manufacturing completed
• CQM/PFM Hardware delivered and inspected
• ICD approved
• CQM harness under integration into FPU (CQM)