Speed Measuring Apparatus.
Abstract
A speed measuring apparatus is provided for indicating a percentage of nominal full speed RPM of a jet engine and also for indicating time required for accelerating and decelerating the engine. A generator output is converted to a square wave and a time interval measurement is made between zero crossings of the square wave. The square wave controls the starting and stopping of a time period counter and measured time is converted to percent RPM which is displayed on a digital incandescent display. Similar time periods are measured when the engine is advanced from idle to full power, and also when the engine is retarded from full power to idle. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 20, 1981
- Accession Number
- ADD008836
Entities
People
- Kenneth L. Coffman
Organizations
- United States Department of the Navy