Swept spectrum analyzer
It is a swept superheterodyne receiver with display device, mainly used for spectrum analysis of continuous signals and periodic signals. It works in the frequency band up to the sub-millimeter, showing only the amplitude of the signal and not the phase of the signal. Its working principle is: the local oscillator adopts a swept oscillator, and its output signal and each frequency component in the measured signal are sequentially subjected to difference frequency conversion in the mixer, and the generated intermediate frequency signal passes through the narrowband filter. After amplification and detection, the video amplifier is applied to the vertical deflection signal of the oscillating tube so that the vertical display on the screen is proportional to the amplitude of each frequency component. The sweep of the local oscillator is controlled by the sawtooth voltage generated by the sawtooth sweep generator. The sawtooth voltage is also used as a horizontal sweep of the oscilloscope so that the horizontal display on the screen is proportional to the frequency.
Real-time spectrum analyzer
The instrument that extracts the entire spectrum information of the signal for a limited time in the presence of the measured signal and analyzes the results is mainly used to analyze non-repetitive stationary stochastic processes and transient processes with short durations, and can also analyze below 40 MHz. Low frequency and very low frequency continuous signals that show amplitude and phase. The Fourier analyzer is a real-time spectrum analyzer. Its basic working principle is to transform the analyzed analog signal into a digital signal through an analog-to-digital conversion circuit, and then add it to the digital filter for Fourier analysis; it is controlled by the central processor. The orthogonal digital local oscillator generates a digital local oscillator signal that varies in sine and cosine, and is also applied to the digital filter and the measured signal for Fourier analysis. The orthogonal digital local oscillator is a swept oscillator. When its frequency is the same as the frequency in the signal under test, it has an output. After the integral processing, the analysis result is obtained for the waveguide to display the spectrum pattern. The analysis results obtained by the sine and cosine signals of the orthogonal local oscillator are complex numbers and can be converted into amplitude and phase. The results of the analysis can also be sent to a print plotter or connected to a computer via a standard interface.
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