What is a sinusoidal signal generator like

Sinusoidal signal generator: Sinusoidal signals are mainly used to measure the frequency characteristics, nonlinear distortion, gain, and sensitivity of circuits and systems. According to the frequency coverage, it is divided into low-frequency signal generators, high-frequency signal generators, and microwave signal generators; According to the adjustable range and stability of output level, it is divided into simple signal generators (i.e., signal sources), standard signal generators (output power can be accurately attenuated to below - 100 decibels milliwatts), and power signal generators (output power can reach tens of milliwatts or more); According to the way of frequency change, it is divided into tuned signal generators, swept frequency signal generators, program controlled signal generators, and frequency synthesis signal generators.