Without measuring in the frequency domain, the source and frequency of the second harmonic remain unknown.
The time-domain measurement shows an impure sine wave. HOW DOES A SPECTRUM ANALYZER WORK?Ī complex signal in the time domain looks vastly different than in the frequency domain. Spectrum analyzers and signal analyzers perform measurements in the frequency domain to measure energy at each particular frequency. In other words, it is possible to transform a time-domain signal into its frequency-domain equivalent. Fourier theory tells us any time-domain electrical phenomenon consists of one or more sine waves of appropriate frequency, amplitude, and phase. In other words, we use the oscilloscope to view the waveform of a signal in the time domain. An oscilloscope enables you to view the instantaneous value of a particular electrical event (or some other event converted to volts through an appropriate transducer) as a function of time. WHAT IS THE DIFFERENCE BETWEEN AN OSCILLOSCOPE AND A SPECTRUM ANALYZER / SIGNAL ANALYZER? Refer to this Spectrum Analyzer and Signal Analyzer technical overview for more information. Signal analyzers measure both the magnitude and phase of an input signal at a single frequency. Spectrum analyzers measure the magnitude of an input signal versus signal frequency. WHAT IS THE DIFFERENCE BETWEEN A SIGNAL ANALYZER AND A SPECTRUM ANALYZER? A signal analyzer combines the superior dynamic range of a swept tuned spectrum analyzer with vector signal analyzer (VSA) capabilities and enables in-channel measurements like error vector magnitude (EVM) that requires both magnitude and phase information. WHAT DOES A SIGNAL ANALYZER DO?Ī signal analyzer measures both the magnitude and phase of an input signal at a single frequency. For more information, refer to this Spectrum Analysis Basics application note for more information. Spectrum analyzers enable tests like noise figure and signal-to-noise ratio (SNR) to characterize the performance of a device and its contribution to overall system performance.
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Frequently Asked Questions – Signal Analyzers (Spectrum Analyzers) WHAT IS A SPECTRUM ANALYZER USED FOR?Ī spectrum analyzer measures the magnitude of an input signal versus its frequency over the full frequency range of the instrument to determine the power of signals.
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