A Frequency Characteristic Analyzer
J. W. Sampsell · Review of Scientific Instruments · 1948
The frequency characteristics analyzer is a device for analyzing the frequency characteristics of filters, amplifiers, and other electronic elements whose pass bands are within the 500–50,000 cycle range. While many frequency analyzers have been constructed, this is one of the first such analyzers in which (1) the width of the swept band and the rate of sweep can be varied independently, (2) the frequency is swept linearly, (3) the response of the pass band circuit can be positioned to appear at any point in the sweep, and (4) the oscillograph time base can be interlocked with the generator frequency.