Round Robin Test Results
Nick Conquest
Matthew Wills
Nhi Dinh
Research Engineer
Electrical Lab Manger
Electrical Engineering Student Assistant
316.243.6940
316.978.5776
Wichita State University
[email protected]
[email protected]
[email protected]
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Round Robin Test Results
Participants
•
Cessna Aircraft Co.
•
National Institute for Aviation Research
•
Cobham Technical Services
•
Rockwell Collins
•
DLS Electronic Systems
•
Thermo Fisher
•
Elite Electronic Engineering, Inc.
•
DnB
•
EMC Partner
•
Boeing
•
Electronics Test Center
•
Environ
Thank you to all labs that participated!
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Data Set
• 12 companies participated in the testing.
• Data was gathered from 25 different generators.
• Multiple companies use a separate generator to
produce WFM-1 and WFM1/WFM2.
• 13 generators were “Custom Built” (DIY)
• 12 generators were off the shelf (OTS)
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Generator Types
4
ID#
Generator Type
ID#
Generator Type
Generator 1
DIY
Generator 14
DIY
Generator 2
OTS 1
Generator 15
DIY?
Generator 3
OTS 1
Generator 16
DIY?
Generator 4
OTS 1
Generator 17
OTS1
Generator 5
OTS 2
Generator 18
OTS3
Generator 6
OTS 2
Generator 19
DIY
Generator 7
OTS 1
Generator 20
DIY
Generator 8
DIY
Generator 21
DIY
Generator 9
OTS 2
Generator 22
DIY
Generator 10
DIY
Generator 23
OTS1
Generator 11
DIY
Generator 24
OTS3
Generator 12
DIY
Generator 25
OTS2
Generator 13
DIY
OTS – Commercial Off the Shelf
DIY- Do it Yourself – Lab Built
Test Article
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6
7
8
9
10
11
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Round Robin Test Summary
• DC resistance data was consistent across all test boxes and test
houses.
• Data on unshielded cabling and power lines with reasonable amount
of impedance was very consistent. Voltage levels or limits are
always obtained along with a low current and small standard
deviation in current/voltage data.
• Data on shielded and hybrid bundles show a lot of variation
depending on the generator used.
• Standard deviation of current on shielded and hybrid bundles was
above 100A.
• Labs were instructed to run the test as they would a standard DO160 test.
– Some labs reran the testing with a different generator when the test level
could not be reached, others did not.
– This may simply be a “communication” error from the Working Group to the
participants.
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Round Robin Test Summary Continued
• DIY generators typically showed variations
• OTS generators of the same manufacturer typically gave similar
results (likely due to similar generator source impedance)
• Source impedance shown to be a determining factor on
current/voltage measured on shielded and hybrid bundles. (Can be
seen specifically in Generators 19-22, which are the same generator
with different source impedance)
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Plans for Next Round of Testing
• What is an acceptable tolerance?
• Determine generator source impedance during
calibration? (i.e. Isc along with Voc at same
generator output setting)
– Will show variation between generator source impedances
to help determine a tolerance between what is an
acceptable test level.
• Changes to Test boxes? Remove Shields?
• Specific points of measurement?
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