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The Hewlett-Packard Model 3581 A/C Wave Analyzer is a portable instrument designed specifically for use in the audio (15 Hz to 50 kHz) frequency range. As a signal Analyzer, the 3581 separates and measures the spectral components of an input signal. By manually tuning the 3581 across the spectrum, the signal components can be individually measured and evaluated. By sweeping the 3581 over the band of interest, a complete spectral display can be plotted with an X-Y recorder connected to the recorder outputs. For added versatility, the 3581 is equipped with a rear panel Tracking Oscillator (BFO) output. When this output is used as an excitation source, the 3581 functions as a network Analyzer for plotting the amplitude-vs.-frequency characteristics of 2-port networks such as amplifiers, attenuators and filters. The amplitude of the tuned signal is indicated on a large, easy-to-read meter with mirror backing. Absolute amplitude can be read in dBV, dBm or rms volts; relative amplitude can be read in dB or percent. The full-scale sensitivity of the 3581 ranges from 0.1 µV rms to 100 V rms. For logarithmic measurements, the dynamic range is 80 dB.