Kimball Williams N.C.E.

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EMC LaboratoryTime Savers

• Kimball Williams N.C.E.
• k.williams_at_ieee.org
• U/M-Dearborn
• June 18, 2009

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Quick Connect Disconnect N
adapters Styrofoam blocks w/Rubber bands No
Mess LISN grounding
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N Connectors

• Problem
• Time to remove and attach N connectors in
  typical EMC measurement Systems.
• Wear on connector and instruments threads in an
  N connector system.

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¼ Turn N - C Adaptors
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Power meter head calibration
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Multi antenna test system
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8 antennas is test system
¼ Turn Connector
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¼ Turn Adaptors
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¼ Turn N to C
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N Push on / Pull off
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Two Possible Solutions
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Cautions

• Rotating Assemblies back off
• Power transmission if not fully engaged
• Training so that co-ops do not disconnect
  equipment by removing the threaded portion of the
  rapid disconnect connector.
• Shipping equipment out for calibration with a
  fast disconnect connector in place (It wont come
  back!)
• Questions?

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Styrofoam Blocks

• Problem
• Large Styrofoam blocks used for holding equipment
  under test and test harnesses.
• Take up lots of space to store
• Constantly being broken or eroded in use
• Problems trying to tape down the test harness

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2 X 2 X 18 Styrofoam
¼ X 4 Wood Dowel Cement 2 from ends.
Rubber Bands
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Test Cable
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Styrofoam Blocks

• Minimal use of Styrofoam materials
• Fast Setup for Ground Plane test setup
• Positive hold of harness on block
• Easy to store materials when test is concluded
• Questions?

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Cautions

• Harness or DUT may try to walk the Styrofoam
  block on the table
• Some forms of Styrofoam may be subject to
  breakage and erosion
• Keep your stock of rubber bands hidden from
  secretarial help

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No Mess LISN Grounding

• Metal Tape Problems
• Sharp edges can cut technicians during
  application
• Tape adhesive residue remains behind on ground
  plane
• Difficulty achieving Resistance lt2.5 mOhms
  between LISN and ground plane
• Tape is a One Time use item and is expenive

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LISN w/Tape Installation
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Tape residue on Ground Plane
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Thumbscrew hold down method
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Ground Stud pigtail
Pigtail for ground stud
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Bold Down LISN - Process

• Clean both surfaces well (LISN base Ground
  Plane)
• Remove any cleaning residue with alcohol
• Place the LISN / Gasket / Ground plane sandwich
  parts together (Tuck in the Ground stud pig
  tail)
• Apply hold down thumb screws and tighten around
  the periphery of the LISN to bring fairly equal
  pressure on the gasket.
• Measure resistance between the LISN base and the
  ground plane. (we normally get values around 650
  uOhms with the first try.

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LISN Sandwich
Pigtail to ground stud
Brass Thumbscrews
Wood Inserts
Home made Gasket
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Questions?

• Quick Connect Disconnect N adapters
• Styrofoam blocks w/Rubber bands
• No Mess LISN grounding

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Thank You!