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Electrical noise reduction techniques contributing to improved data quality at the National Transonic FacilityIn initial use, the high-speed digital data acquisition systems at Langley Research Center's National Transonic Facility produced data containing unacceptably high noise levels. Described is a process whereby the contributing noise sources were identified and eliminated. The effects of 60 Hz power, system grounding, EMI/RFI, and other problems are discussed and the corrective action taken is outlined. The overall effort resulted in an improvement of greater than 5:1 in system performance. Although the report describes a system specifically used for wind tunnel data acquisition, the corrective techniques employed are generally applicable to large scale high-speed data systems where signal resolution in the low microvolts range is important.
Document ID
19890001825
Document Type
Contractor Report (CR)
Authors
Mcphee, J. R. (Wyle Labs., Inc. Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1988
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Report/Patent Number
NAS 1.26:4193
NASA-CR-4193
Funding Number(s)
PROJECT: RTOP 505-61-01-01
CONTRACT_GRANT: NAS1-18304
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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