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Frequency Synthesizer For Tracking FilterDigital frequency-synthesizing subsystem generates trains of pulses, free of jitter, for use as frequency-control signals in tracking filters. Part of assembly of electronic equipment used to measure vibrations in bearings in rotating machinery. Designed to meet requirements for tracking narrow-band cage-rotation and ball-pass components of vibrations, as discussed in "Frequency-Tracking Error Detector" (MFS-29538) and "Ball-Pass Cage-Modulation Detector" (MFS-29539). Synthesizer includes preset counter, output of which controls signal for ball-pass filter. Input to this preset counter updated every 2 microseconds: responds almost immediately, effectively eliminating relatively long response time (lock-in time) and phase jitter.
Document ID
19900000394
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Randall, Richard L.
(Rockwell International Corp.)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: NASA Tech Briefs
Volume: 14
Issue: 8
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
MFS-29541
Accession Number
90B10394
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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