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Title: Development Of Uncertainties For 14mmJMPEDANCE Standards
Author: Michaela. V. Cruz
Source: 1985 Measurement Science Conference
Year Published: 1985
Abstract: The development of the uncertainty statements for a wide range of SWR values became necessary when this laboratory received impedance standards whose values exceeded a SWR of 1.50. Normal calibration support at that time was 1.0 to 1.5 SWR. Standard MichaelA. V. Cruz Director Electromagnetic-Standards Division, West Navy Primary Standards Laboratory, West Naval Air Rework Facility, North Island San Diego, California impedances whose SWR values ranged from 2.0 to 4.0 had to be analyzed for errors since the past analysis had only been used to evaluate SWR values to 1.5. A complete error analysis review was put into action. The methods used to measure SWR were high directivity bridges (200-400MHz) and standard airlines (l.O-8.5GHz). A systematic and shortterm error analysis was performed using propagation of error techniques and a long-term error model was derived from past historical customer data, as well as, from a newly created data base from in-house standards data. This paper addresses these systematic, short-term and long-term errors in the measurement of 14mm impedance standards.

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