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Session 1532

An Honors Contract introduces simplified Methods for Measuring Quartz Crystal Electrical Parameters

James O. Everly, P.E. University of Cincinnati

Abstract

A University of Cincinnati Honors Contract offers selected students in Electrical Engineering Technology an opportunity to explore technical topics slightly beyond the scope of the course syllabus. This paper presents the structure of the contract tailored to third quarter Electrical Engineering Technology freshman students enrolled in Electric Circuits II. The Honors Contract described in this paper introduces students to simplified tools and test procedures for determining the electrical parameters of a quartz crystal. As a laboratory exercise, students investigate an experimental technique for developing the equivalent electric circuit of a quartz crystal. The measured crystal parameters together with band-pass filter design equations are subsequently implemented using a standard spreadsheet, thus eliminating the need to expose freshman students to complex mathematics. To illustrate a practical use for quartz crystals, a third order Butterworth and Cohn band-pass filter is designed. Laboratory testing and assembly time to complete the contract is approximately six hours distributed over the quarter. In addition, honors contract students are required to maintain a project journal to record ideas, data, test results, and experiences throughout the project.

Introduction

This paper utilizes an Honors Contract to present simplified test procedures for determining the equivalent electric circuit parameters of a quartz crystal. First, the electrical characteristics and parameters of the crystal are defined followed by a description of an experimental setup. The hardware setup is simple and relies on a homemade signal generator and crystal test fixture. The remaining components of the system were purchased at a very reasonable price on eBay. For test purposes a batch of twenty 3.579 MHz "TV color burst" crystals were purchased from an electronics supplier. A detailed test procedure is described, and a set of simple formulas are given to determine the crystal parameters.

Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright 2005, American Society for Engineering Education

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Everly, J. (2005, June), An Honors Contract Introduces Simplified Methods For Measuring Quartz Crystal Electrical Parameters Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--15302