3-8 Setting Sweep Parameters Spectrum Analyzer Measurements
3-38 PN: 10580-00447 Rev. H Spectrum Analyzer MG
3-8 Setting Sweep Parameters
Sweep parameters are set using the “SWEEP Menu” on page 3-39.
Single/Continuous
When the Continuous toggle is pressed, the instrument toggles between single sweep and continuous sweep. In
single sweep setting, the instrument waits until SWEEP ONCE is pressed or another setting is selected.
Trace Points
The number of points sets the number of display points in the trace that are generated from the measurement
data.
Sweep Limitations
With some spectrum analyzers, the user has control over sweep time (the elapsed time of each sweep, also
referred to as scan time). An analyzer cannot be swept arbitrarily fast while maintaining its specified accuracy,
but will have a sweep rate limitation depending upon the resolution bandwidth, video bandwidth, and
frequency range selected. The sweep rate is not usually chosen by the user, but is determined by the frequency
range swept divided by the sweep time. The limitation on sweep rate comes from the settling or response time
of the resolution and video bandwidth filters. If an analyzer is swept too quickly, the filters do not have time to
respond, and the measurement is inaccurate. Under such conditions, the analyzer display tends to have a
“smeared” look to it, with the spectral lines being wider than normal and shifted to the right and at a lower
amplitude than is correct.
Anritsu Field Master Series is designed to relieve the user from having to calculate the sweep speed or
experiment to discover a sweep speed that yields accurate results. When changing the RBW and VBW, the
sweep speed automatically changes to the fastest sweep speed that will yield accurate results. The sweep speed
will be faster for a wide RBW or VBW and slower for a narrow RBW or VBW. Regardless of the minimum
sweep time, the instrument will never sweep faster than the RBW and VBW settings will allow. The
instrument is designed to ensure that no uncalibrated measurement conditions will occur.
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