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Ridley Universal Injector
A Brief History
I have been working with frequency response analyzers for over 30 years. My first introduction was when working on switching power supplies during my undergraduate degree at Boston University. My senior project was to design an offline switching power supply with a 20 kHz sine wave output regulated at 6,000 VAC. During that project, it quickly became apparent that the problems encountered during the design would have to be analyzed in both the frequency domain and the time domain. My first frequency response analyzer in school consisted of a vacuum tube amplifier, function generator, and oscilloscope. All measurements were done manually.
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