All instruments that generate test signals are collectively referred to as signal sources, also known as signal generators, which are used to generate electrical test signals with specific parameters required by the circuit under test. When testing, studying or adjusting electronic circuits and equipment, in order to determine some electrical parameters of the circuit, such as measuring frequency response, noise factor, and calibrating voltmeters, it is required to provide electrical signals that meet the specified technical conditions to simulate the excitation signals of the equipment under test used in actual work. When it is required to measure the steady-state characteristics of the system, a sinusoidal signal source with known amplitude and frequency is required. When testing the transient characteristics of the system, a rectangular pulse source with known leading edge time, pulse width and repetition period is required. In addition, the parameters of the signal source output signal, such as frequency, waveform, output voltage or power, are required to be accurately adjusted within a certain range, have good stability, and have output indication. Signal sources can be divided into four categories according to the different output waveforms: sine wave signal generators, rectangular pulse signal generators, function signal generators, and random signal generators. Sine signals are the most widely used test signals. This is because the method of generating sinusoidal signals is relatively simple, and it is more convenient to measure with sinusoidal signals. Sinusoidal signal sources can be divided into several types according to different operating frequency ranges.
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