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Tests Methods and Measurement Uncertainties

This document discusses the importance of precise and unambiguous test methods in telecommunications equipment testing. It outlines standards related to measurement uncertainty across three main areas: radio equipment, terminal equipment, and transmission equipment. Key findings from the ETSI Operational Coordination Group highlight the necessity for all test methods to be validated, based on agreed standards, and to evaluate practical maximum allowable measurement uncertainties. This includes guidance on utilizing shared risk approaches and evaluating emerging testing methods.

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Tests Methods and Measurement Uncertainties

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  1. Tests Methods and Measurement Uncertainties Alan Dearlove STF 259 MTS Meeting 24th March 2004

  2. Introduction RAST Resolution 10/8 on measurement uncertainty in three areas: Radio equipment testing; Terminal equipment testing; Transmission equipment testing.

  3. Standards • Quality of standards • Test methods should be precise and unambiguous • Methods should be based on agreed international, regional or national standards • Fall back position internally developed test methods • All test methods are to be validated • Estimation of measurement uncertainty for each measurement result

  4. Radio Equipment Testing ETSI operational co-ordination group (OCG), centre of contact for all telecommunication technologies; ETSI task group on measurement uncertainty OCG/ERM task group 33; Technical content and approval of deliverables under ETSI TC-ERM; Formation of specialist task force (STF) 241.

  5. STF 241 Phase 1 Extension of frequency range for measurement methods above 1 GHz (EMC and radio testing); Evaluation of “shared risk” approach;

  6. STF 241 Phase 1 Prepare a Technical Report to provide guidance on application of “shared risk”; Determine practical maximum allowable measurement uncertainty for inclusion in ETSI specifications.

  7. STF 241 Phase 1 Recommendations Maximum practical frequency 40 GHz; Uncertainty of measurement nominally 6db; Use of fully lined anechoic chambers to be evaluated;

  8. STF 241 Phase 1 Recommendations Evaluation of radiated test methods; Evaluation of compliance using shared risk within maximum measurement uncertainty; Evaluation of compliance using shared risk when maximum measurement uncertainty is exceeded.

  9. STF 241 Phase 2 Inclusion of conducted measurements; Inclusion of safety testing measurement uncertainty; Evaluation of radiated and conducted radio test methods; Technical review of emerging test methods.

  10. STF 259 Phase 1 and 2 • Continuation STF on test methods and measurement uncertainty • Practical accuracy of measurements above 40 GHz • Review of future work in other ETSI testing disciplines • Evaluation of automated test methods and systems

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