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The most common instrument used in any EMC test lab is the spectrum analyzer. The spectrum analyzer is a swept-tuned superheterodyne device, although fast Fourier transform (FFT)-style analyzers are becoming more common. FFT analyzers can capture single-shot type events but often have limitations. Examples include limited frequency range it can measure, limited sensitivity to low-level signals, and limited dynamic range of the measurement. There have also been recent developments in real-time spectrum analyzers (RTSA), which use a combination of a superheterodyne receiver, FFT processing, and fast update rate.

Chapter Contents:

  • 3.1 Spectrum Analyzers
  • 3.2 EMI Receivers
  • 3.3 Detectors
  • 3.4 Narrowband versus Broadband Measurements
  • 3.5 How Sweep Speeds Affect Measurements
  • 3.6 Troubleshooting with Spectrum Analyzers
  • 3.7 Oscilloscopes
  • 3.8 Current Probes
  • 3.9 Near-Field Probes
  • 3.10 Antennas

Inspec keywords: superheterodyne receivers; fast Fourier transforms; spectral analysers

Other keywords: FFT; RTSA; single-shot type event; fast Fourier transform; EMC test lab; instrumentation; real-time spectrum analyzer; swept-tuned superheterodyne receiver device

Subjects: Integral transforms; Network and spectrum analysers; Radio links and equipment

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