DocumentCode
1455741
Title
Requirements and design for a D-C null detector
Author
Maltby, F. L.
Author_Institution
The Bristol Company, Waterbury, Conn.
Volume
71
Issue
2
fYear
1952
Firstpage
133
Lastpage
133
Abstract
Modern instrumentation requires the measurement of many variables that are expressed most readily as d-c voltages. In the apparatus described here, a reversing synchronous contactor is used to invert the error signal into an alternating potential of the power frequency. This alternating potential in turn is amplified and impressed upon the control winding of a 2-phase motor which has its reference winding continuously energized at the power frequency.
Keywords
Contacts; Detectors; Electric potential; Harmonic analysis; Power harmonic filters; Switches; Windings;
fLanguage
English
Journal_Title
Electrical Engineering
Publisher
ieee
ISSN
0095-9197
Type
jour
DOI
10.1109/EE.1952.6437942
Filename
6437942
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