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Project Tuna Ii Bode Analyzer And Teaching Tool

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2006 Annual Conference & Exposition


Chicago, Illinois

Publication Date

June 18, 2006

Start Date

June 18, 2006

End Date

June 21, 2006



Conference Session

Instrumentation and Measurements: Innovative Course Development

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Page Count


Page Numbers

11.1045.1 - 11.1045.12



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Paper Authors


David Beams University of Texas-Tyler

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DAVID M. BEAMS is an Associate Professor of Electrical Engineering at the University of Texas at Tyler. He received his BS and MS degrees from the University of Illinois at Urbana-Champaign in and the Ph.D. from the University of Wisconsin-Madison. He has had over 16 years of industrial experience in addition to his 8 years with UT-Tyler. He is a licensed professional engineer in Wisconsin and Texas and holds or shares four patents.

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Project TUNA II –Bode Analyzer and Teaching Tool


Students measuring the frequency response of a linear circuit (e.g., an active filter) by manual methods find the task mind-numbing and repetitive, and the purpose was frequently lost in the minutiae of data-taking. Project TUNA (Texas Universal Network Analyzer), a Bode analyzer for low to moderate frequencies, was conceived as an answer to this problem. The prototype of Project TUNA was developed as a project in Electronics II (EENG 4409) in 1999, and permanent copies were constructed in 2000. Project TUNA has been integrated into the electronics curriculum of UT-Tyler since that time. It is used as both a laboratory instrument and as a teaching tool, particularly to illustrate the principles of phase-sensitive demodulation.

However, Project TUNA had drawbacks. The performance of its switching-type phase-sensitive demodulator degraded markedly above 100kHz. The dynamic range of voltage gains was limited ( 30dB), and analysis times were longer than necessary for frequencies above a few hundred Hz. Project TUNA also required three GPIB-controlled test instruments (power supply, function generator, and multimeter).

These limitations provided the impetus for Project TUNA II. Project TUNA II has much- improved performance: wider dynamic range ( 40dB), wider frequency range (10Hz to 1MHz), and shortened analysis times for frequencies above 200Hz. Use of a multifunction data- acquisition card in the host PC eliminated the GPIB-controlled power supply and dc voltmeter; only a GPIB-controlled function generator is required. Project TUNA II was developed in prototype form in 2001; permanent hardware and a much-improved LabVIEW virtual instrument were created in 2004. Project TUNA II is currently used alongside Project TUNA in electronics laboratories, and Project TUNA II is used to expand the instructional themes of the original Project TUNA. This paper describes the development, design, laboratory use, and instructional resources of Project TUNA II.

Description of prior work—overview of Project TUNA

The junior-year curriculum of the BSEE program of the University of Texas at Tyler includes two semesters of electronics laboratory courses. Measurement of frequency response of linear networks is a part of the laboratory procedures of each semester. In particular, extensive measurements of complex (magnitude and phase) frequency response are made in a laboratory procedure on active filters in EENG 4109 (Electronic Circuit Analysis II Laboratory). Students performing these measurements by manual methods found the task mind-numbingly repetitive, and the purpose of the laboratory was frequently lost in the minutiae of data-taking. Project TUNA (Texas Universal Network Analyzer), a Bode analyzer for low to moderate frequencies, was conceived as an answer to this problem. Project TUNA, combining custom external hardware, GPIB instrumentation, and a LabVIEW virtual instrument program, was designed and developed in prototype form as a class project in EENG 4109 in 1999. Permanent copies of the Project TUNA hardware were constructed in 2000. Project TUNA has been used in the laboratory curriculum since that time.

Beams, D. (2006, June), Project Tuna Ii Bode Analyzer And Teaching Tool Paper presented at 2006 Annual Conference & Exposition, Chicago, Illinois. 10.18260/1-2--1040

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