108
Making Time-Gated Measurements
Gated FFT Measurement
Gated FFT Measurement
This procedure utilizes gated FFT to gate the FM signal. For concept and theory
information about gated FFT see “How time gating works” on page 199.
Step Action Notes
1 Set the analyzer to the
Spectrum Analyzer mode.
• Press Mode, Spectrum
Analyzer.
This enables the spectrum analyzer
measurements.
2 Preset the analyzer • Press Mode Preset.
3 Set the center frequency,
span, reference level and
attenuation.
a. Press FREQ Channel,
Center Freq, 40, MHz.
b. Press SPAN X Scale,
Span, 500, kHz.
c. Press AMPTD Y Scale,
Ref Level, 10, dBm.
4 Set the Gate source to the
external trigger input on the
rear panel.
• Press Sweep/Control,
Gate, More, Gate
Source, External 1.
5 Set the gate method and turn
gate on.
a. Press Sweep/Control,
Gate, Gate Method,
FFT.
b. Press Gate (On).
6 Select the minimum
resolution bandwidth
required.
• Press BW, Res BW
(Auto).
See Figure 8-12.
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