Project TUNA

Project TUNA (Texas Universal Network Analyzer) is a computer-based laboratory instrument designed and built as a class project in EENG 4409 (Electronic Circuit Analysis II) in the spring semester of 1999 at the University of Texas at Tyler. It combines LabVIEW virtual-instrumentation software, IEEE-488-based test equipment, and custom hardware to measure the magnitude and phase of the ac voltage gain of a linear network between 10 Hz and 100 kHz. Results are displayed as a Bode plot (simultaneous semilogarithmic displays of the magnitude of decibel voltage gain and phase shift vs. frequency). The custom hardware uses switching phase-sensitive demodulation to measure the magnitude and phase of both the input and output voltages; voltage gain is computed as the ratio of the output voltage to the input voltage, and phase shift is computed as difference of the measured output and input phases. Project TUNA was described in a paper published in Session 2320 of the annual conference of the American Society for Engineering Education held June 18-21, 2000, in St. Louis, MO.

Schematics in Adobe .pdf format and artwork in AutoCAD .dwg format are available. A parts list and the TUNA virtual instrument for LabVIEW 7.1 are available. Follow this link to meet some of the Project TUNA participants.

Gain in dB (upper plot) and phase response in degrees (lower plot) measured by Project TUNA of an active bandpass filter