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Predicting the Future . The GTEM “Tamed?”. Mathew Aschenberg Derrell Gottwald Charles Grasso Echostar Technology Echostar Technology Echostar Technology Agency Engineer Quality Assurance Engineer Senior Agency Engineer

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predicting the future

Predicting the Future

The GTEM “Tamed?”

Mathew Aschenberg Derrell Gottwald Charles Grasso

Echostar TechnologyEchostar Technology Echostar Technology

Agency Engineer Quality Assurance Engineer Senior Agency Engineer

(303)706-5064 (303) 706-5236 (303) 706 – 5467

Email: [email protected] Email: [email protected] Email:[email protected]

pre compliance testing
Pre-Compliance Testing
  • Will It Pass?

PREDICTION

Not

CORRELATION

measurement uncertainty vs correlation
Site to Site Differences

Acceptable correlation differences

Calibration variation

Tester differences/preferences

Weather

Voltage supplied (120 vs. 115)

Measurement Uncertainty vs. Correlation
measurement uncertainty vs correlation1
Measurement Uncertainty vs. Correlation

EUT Variation

  • Cable Layout
  • System state
  • Seam contact
benefits of process
Benefits of Process
  • Accounts for site differences
  • Provides a linear gauge of unit performance
  • Self-Reinforcing - Improves with time
  • Transferable to other tests
future work
Future Work
  • Incorporate frequency specific statistics
  • Account for inter-relatedness between emissions
gtem overview
GTEM Overview
  • 50Ω transmission line
  • 3-orthogonal axis measurements
  • Spherical not cylindrical measurements
  • Size limited
  • Cables present problems
summary
Summary:
  • Correlation between OATS and non-traditional sites can be difficult to achieve.
  • A method is proposed that accounts for site differences and provides for prediction instead of correlation.
  • Using this method a GTEM, for example, can be used to provide useful pre-compliance data.
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