Asee peer logo

LED Timing Light Upgrade for Synchronous Machines Laboratory Equipment

Download Paper |


2018 ASEE Annual Conference & Exposition


Salt Lake City, Utah

Publication Date

June 23, 2018

Start Date

June 23, 2018

End Date

July 27, 2018

Conference Session

Instrumentation Division Technical Session 1

Tagged Division


Page Count




Permanent URL

Download Count


Request a correction

Paper Authors


Herbert L. Hess University of Idaho

visit author page

Herb Hess is Professor of Electrical Engineering at the University of Idaho, where he teaches subjects in He received the PhD Degree from the University of Wisconsin-Madison in 1993. His research and teaching interests are in power electronics, electric machines and drives, electrical power systems, and analog/mixed signal electronics. He has taught senior capstone design since 1985 at several universities.

visit author page


Sean Gordon Daniel University of Idaho

visit author page

I am an Electrical Engineering student at the University of Idaho interested in electric machines and electronics.

visit author page

Download Paper |


The purpose of this project is to develop a timing light circuit capable of using a light emitting diode. With the incandescent light bulb no longer being produced, there is a demand for a timing light capable of using an LED. The trouble with using an LED in place of an incandescent bulb is its inability to emit light when exposed to the low or negative voltages. This issue is addressed using a full wave rectifier and introducing a biasing voltage. The LED timing light will have the same behavior as the conventional timing light timing light. The timing light increases in brightness as the phase angle between two sinusoidal voltage sources deviates from zero degrees. For example, it can be used to ensure a generator and power grid frequencies and timing are in sync before being electrically connected. This LED timing light was developed for an energy systems lab where the lights are used to synchronize a three phase synchronous generator to a large stable system which is essential in ensuring the stability of any power grid.

Hess, H. L., & Daniel, S. G. (2018, June), LED Timing Light Upgrade for Synchronous Machines Laboratory Equipment Paper presented at 2018 ASEE Annual Conference & Exposition , Salt Lake City, Utah. 10.18260/1-2--30757

ASEE holds the copyright on this document. It may be read by the public free of charge. Authors may archive their work on personal websites or in institutional repositories with the following citation: © 2018 American Society for Engineering Education. Other scholars may excerpt or quote from these materials with the same citation. When excerpting or quoting from Conference Proceedings, authors should, in addition to noting the ASEE copyright, list all the original authors and their institutions and name the host city of the conference. - Last updated April 1, 2015