Project TUNA II
Project
TUNA II is an improved version of Project
TUNA (Texas Universal Network Analyzer), a
computer-based laboratory instrument to measure the frequency response of
active and passive networks. Project
TUNA II, like its predecessor, consists of a LabVIEW virtual-instrument program
and custom external hardware. Project
TUNA II sought to improve Project TUNA in the following ways:
·
Increased frequency
range (extending the upper frequency limit to 1 MHz);
·
Increased measurement
dynamic range;
·
Shortened measurement
times;
·
Reduced dependence upon
GPIB (IEEE-488) instrumentation;
·
Use of a multifunction I/O
card for data-acquisition and control.
Electrical
Engineering senior student Zinnour Soultanov
undertook Project TUNA II in the spring semester of 2001 as a project in Senior
Design (EENG 4415) at the University of Texas at Tyler. His design task involved redesigning both the
custom hardware and the virtual-instrument program. His design effort substantially met all
goals.
Block diagram of Project TUNA II hardware. The selection of the proper quadrature network, the attenuator setting, the amplifier gain, the switching of the phase-sensitive demodulator input, and the selection of the low-pass filter time constants are all controlled directly with a multifunction I/O card. The 33120A signal generator remains as an IEEE-488 instrument.
Resources for Project TUNA II
Resources
for Project TUNA II include:
·
Schematic diagrams in Adobe .pdf format
·
Virtual-instrument software for LabVIEW 7.1
·
Tutorial on switching and
multiplying phase-sensitive demodulation
·
Quadrature-network design
worksheet
·
Paper and presentation given at the ASEE 2006
Annual Conference in
·
Images of the TUNA II instrument