Audio Frequency (AF) Signal Generator introductory Information & Uses

Audio Frequency (AF) Signal Generator introductory Information & Uses Points : audio frequency (af) signal generator introductory information & uses The audio — frequency (AF) generator is a convenient source of variable frequency test signals in the audio — frequency range (20 Hz. to 20 KHz). These signal are used to test gain (amplification) frequency response, phase shift, and distortion of electrical and electronic circuits that operate at audio — frequencies.

Such equipment includes public address systems, high fidelity amplifiers, and the audio circuits of AM, FM and TV receivers. The principal circuit of an AF generator is a variable frequency audio oscillator. The frequency range depends on the particular AF generator; a typical range is from 20 Hz to 2000 KHz. A calibrated frequency control is used to vary the oscillator output frequency. In a broad-band (Wide range) AF generator, the frequency band may be divided into several convenient ranges. The appropriate range is then selected with range or multiplier switches that operate with the variable calibrated dial. The output waveform is a fundamental sine wave; however variable square wave is often also provided.

The amplitude of the output voltage is adjusted by a level. The amplitude of the output voltage is adjusted by a level or amplitude control. There are terminals for connecting the output signal to the circuit under test. Various other controls and functions may be included in the AF generator depending on the design and the manufacturer.