Operating Your Instrument
Application Presets
1.
Select
File
>
Application Presets
>
Spectrum Analysis (0.1-14 GHz)
or
Spectrum Analysis
(0.1-6.2 GHz)
as appropriate. Click
OK
.
2.
Set the measurement frequency using the front-panel knob or keypad.
3.
Adjust the span to show the necessary detail.
Time-Frequency Analysis
The Time-Frequency Analysis application preset opens the following displays:
Time Overview: Shows a time-domain view of the analysis time ‘window’.
Spectrogram: Shows a three-dimensional view of the signal where the X-axis represents frequency,
the Y-axis represents time, and color represents amplitude.
Frequency vs. Time: This display’s graph plots changes in frequency over time and allows you to
make marker measurements of settling times, frequency hops, and other frequency transients.
Spectrum: Shows a spectrum view of the signal. The only trace showing in the Spectrum graph
after selecting the Time-Frequency Analysis preset is the Spectrogram trace. This is the trace from
the Spectrogram display that is selected by the active marker. Stop acquisitions with the Run button
because its easier to work with stable results. In the Spectrogram display, move a marker up or down
to see the spectrum trace at various points in time.
The analysis period is set to 5 ms.
To use the Time-Frequency application preset:
1.
Select
File
>
Application Presets
>
Time-Frequency Analysis
. Click
OK
.
2.
When the preset’s displays and settings have all been recalled and acquisitions are running, adjust the
center frequency and span to capture the signal of interest.
3.
Set the Reference Level to place the peak of the signal approximately 0-10 dB down from the top of
the Spectrum graph.
4.
If the signal is transient in nature, you might need to set a trigger to capture it. For more information
on triggering in the time and frequency domain, see
When the signal has been captured, the spectrogram shows an overview of frequency and amplitude
changes over time. To see frequency transients in greater detail, use the Frequency vs. Time display.
The Time-Frequency Analysis preset sets the analysis period to 5 ms. The Spectrum Span is 40 MHz. The
RBW automatically selected for this Span is 300 kHz. For a 300 kHz RBW, the amount of data needed
for a single spectrum transform is 7.46
μ
s. A 5 ms Analysis Length yields 671 individual spectrum
transforms, each one forming one trace for the Spectrogram to display as horizontal colored lines. This
preset scales the Spectrogram time axis (vertical axis) to -2, which means that the Spectrogram has done
two levels of time compression, resulting in one visible line for each four transforms. This results in 167
lines in the Spectrogram for each acquisition, each covering 29.84
μ
s.
RSA6100A Series Real-Time Spectrum Analyzers Help
23
Summary of Contents for RSA6100A Series
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