Construction, Measurement, Shimming, and Performance of the NIST-4 Magnet System

The magnet system is one of the key elements of a watt balance. For the new watt balance currently under construction at the National Institute of Standards and Technology, a permanent magnet system was chosen. We describe the detailed construction of the magnet system, first measurements of the fie...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2014-12, Vol.63 (12), p.3027-3038
Main Authors: Seifert, Frank, Panna, Alireza, Shisong Li, Bing Han, Chao, Leon, Cao, Austin, Haddad, Darine, Heeju Choi, Haley, Lori, Schlamminger, Stephan
Format: Article
Language:English
Subjects:
Balancing
Construction
Density
Electromagnetic measurements
Flats
Instrumentation
Magnetic circuits
Magnetic flux
Measurement standards
Measurement units
NIST
Permanent magnets
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Summary:The magnet system is one of the key elements of a watt balance. For the new watt balance currently under construction at the National Institute of Standards and Technology, a permanent magnet system was chosen. We describe the detailed construction of the magnet system, first measurements of the field profile, and shimming techniques that were used to achieve a flat field profile. The relative change of the radial magnetic flux density is
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2014.2323138