The Hp - Agilent 8903E Audio Analyzer provides versatile performance for audio measurements from 20 Hz to 100 kHz. The 8903E combines the functionality of a high-performance distortion analyzer, frequency counter, ac voltmeter, dc voltmeter, and SINAD meter into one compact package. For ease of use, most measurements on the 8903E are made with only one or two keystrokes. The 8903E automatically tunes and autoranges for maximum accuracy and resolution. For quick identification of input signals, the analyzer counts and displays the input frequency in all ac measurement modes.