Agilent Technologies Agile or Elusive Signals Using Uživatelský manuál stáhnout pdf (Strana 16)

Improving POI with FFT Analyzers:

Several Steps for Dramatic Improvement

Use Much Longer Time Records (25,000 points or more)

• Time record length goes up faster than FFT speed goes down

Narrow Frequency Span to the Minimum Needed

• Time record is longer (in time) for given number of points

Use IF Magnitude Trigger, Pre/Post Delays, Holdoff

• Avoid measuring when no signal present in span

Use Persistence or Density/History Displays

• Typically persistence, to make peaks last long enough to be noticed

Peak Hold

Result: POI Dramatically Improved, Though may not be Near 100%

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Agilent Technologies Agile or Elusive Signals Using Uživatelský manuál Strana 16