slide1 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Topics: Printed Circuit Board Manufacturing Maintenance Power & Grounding PowerPoint Presentation
Download Presentation
Topics: Printed Circuit Board Manufacturing Maintenance Power & Grounding

Loading in 2 Seconds...

play fullscreen
1 / 12

Topics: Printed Circuit Board Manufacturing Maintenance Power & Grounding - PowerPoint PPT Presentation


  • 211 Views
  • Uploaded on

GlueX Electronics Review Jefferson Lab July 23-24, 2003 R. Chris Cuevas Jefferson Lab Physics Division Group Leader -- Fast Electronics. Topics: Printed Circuit Board Manufacturing Maintenance Power & Grounding. PCB Manufacturing.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Topics: Printed Circuit Board Manufacturing Maintenance Power & Grounding' - KeelyKia


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

GlueX Electronics Review

Jefferson Lab

July 23-24, 2003

R. Chris Cuevas

Jefferson Lab

Physics Division

Group Leader -- Fast Electronics

Topics:

Printed Circuit Board Manufacturing

Maintenance

Power & Grounding

GlueX Electronics Review --R.C. Cuevas

slide2

PCB Manufacturing

  • JLAB Electronics Group & GlueX collaborators have extensive experience with design and ordering PCBs in industry.
  • PCB is not a mechanical part!
    • Electrical characteristics more important than mechanical tolerances
    • Design Tools are essential for verification
      • We have PCAD, Gerber View Tools but,,,
      • More extensive simulation tools would be useful
      • (e.g.) PCB layout simulation, signal integrity modeling

GlueX Electronics Review --R.C. Cuevas

slide3

PCB Manufacturing

  • 1000’s of custom PCBs have been manufactured in industry for CLAS. [Drift Chamber, Level II Trigger, Timing distribution]
  • Typical PCB development ‘procedure’
    • Design requirements -- Specifications/Format
    • EECAD -- Schematic capture -- Board layout
    • Prototype ordered -- Assembled on site
    • TEST -- Verify circuit performance -- Record results
    • Capture all ECOs [ Engineering Change Order ]

GlueX Electronics Review --R.C. Cuevas

slide4

PCB Manufacturing

  • ‘Procedure continued’
    • Verify all ECOs in new layout
    • Prepare order for contract manufacturing & assembly
    • Evaluate manufacturers -- Not on price alone!
      • Long term reputation/experience
      • Documented Quality Control standards [ IPC,ISO ]
      • Automated assembly equipment
      • Bare board test equipment
      • 1st Article assembly very important

GlueX Electronics Review --R.C. Cuevas

slide5

Maintenance

  • No glamour, but planning NOW is critical for high availability
    • Must plan for spare PCBs for each custom design
    • Crucial components must be identified
    • Spare devices purchased for long term replacement
    • DOCUMENTATION -- Must archive and provide on-line
      • Schematics
      • System/Wiring Diagrams
      • Maintain Firmware Development Tools and Code
      • Test Programs

GlueX Electronics Review --R.C. Cuevas

slide6

Maintenance

  • High Availability Demands:
    • Low Mean-Time-to-Repair
      • Example: Powered Card Enclosures [ “Crate” ]
        • Removable power supply units
        • Removable fan tray
    • Easy access to circuit boards -- test points
    • Remote monitoring of “Crate” systems -- V, I, Temperature
    • Remote reset feature where applicable

GlueX Electronics Review --R.C. Cuevas

slide7

Maintenance

  • Planning for the repair “shop”:
    • Must provide training for technicians on new designs
    • Test “Stations” for all custom and commercial boards
    • Ability to repair/rework circuit cards, power supplies
    • Assure proper tools and test equipment are provided
    • Establish circuit board calibration/repair/tracking database
    • Use new technologies for keeping track of all modules in the experiment. [ RF Id,, Bar code ]

GlueX Electronics Review --R.C. Cuevas

slide8

Power & Grounding

  • Very extensive topic and,
    • We have good experience with Hall B [ CLAS ]
    • Careful planning of power isolation and grounding grid
    • Extensive review of AC Mains requirements
    • Must include grounding grid requirements for Accelerator connection and civil engineering
    • Must identify all large “consumers” of AC Mains
      • Superconducting Magnet system
      • Building utilities [ HVAC, LCW, Pumps, Crane ]
      • Front End Readout crates
      • High Voltage systems

GlueX Electronics Review --R.C. Cuevas

slide9

Power & Grounding

GlueX Electronics Review --R.C. Cuevas

slide10

Power & Grounding

  • Reasons for Grounding
  • Shock and Safety Hazard Control
  • Reduce lightning related gradients
  • Avoid injury to personnel
  • Avoid damage to Electrical/Electronic equipment
  • Establish return reference
  • EMI control
    • Shield reference for cables, isolation transformers

GlueX Electronics Review --R.C. Cuevas

slide11

Power & Grounding

  • Learn from omissions: [ CLAS example ]
  • Plan for dedicated network conduit(s)
    • High speed network gear & beam-line diagnostic
    • equipment not in close proximity to detector power supplies
  • Low radiation levels in Hall D
    • Should allow extensive use of Fiber Optics for
      • Communication links --
      • Data acquisition --
      • Optical isolation for control circuits where applicable

GlueX Electronics Review --R.C. Cuevas

slide12

Summary

  • PCB Manufacturing
    • Excellent design record.
    • Almost zero problems with production PCBs in CLAS
    • New design/verification tools would be beneficial
  • Maintenance
    • Electronics Group is a small [ efficient ] group
    • Large portion of readout electronics for CLAS and other Halls are mostly commercial [aging] electronics
    • Custom electronics will demand better tracking, repair and long term availability of crucial components
  • Power & Grounding
    • Careful review of AC Mains requirements NOW
    • Requirements for detector power supplies, HV, Front End crates need to be established,,,
    • Grounding/shielding configuration is crucial for low noise measurements and reducing EMI pickup

GlueX Electronics Review --R.C. Cuevas