Predicting%20the%20Future

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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
[phone] [phone]
(303) 706 5467 Email matt.aschenberg_at_echosta
r.com Email derrell.gottwald_at_echostar.com Emailc
harles.grasso_at_echostar.com
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Pre-Compliance Testing

• Will It Pass?
• PREDICTION
• Not
• CORRELATION

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Measurement Uncertainty vs. Correlation

• Site to Site Differences
• Acceptable correlation differences
• Calibration variation
• Tester differences/preferences
• Weather
• Voltage supplied (120 vs. 115)

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Measurement Uncertainty vs. Correlation

• EUT Variation
• Cable Layout
• System state
• Seam contact

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Statistical Review
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The Prediction Process
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Preparing the Wort
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Sample Report
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Benefits of Process

• Accounts for site differences
• Provides a linear gauge of unit performance
• Self-Reinforcing - Improves with time
• Transferable to other tests

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Future Work

• Incorporate frequency specific statistics
• Account for inter-relatedness between emissions

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EMCO 5407 GTEM!
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GTEM Overview

• 50? transmission line
• 3-orthogonal axis measurements
• Spherical not cylindrical measurements
• Size limited
• Cables present problems

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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.