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Unit
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The unit for the frequency axis is switchable.
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Apart from the units Hz and 1/min, the display as order in order, Hz and order, 1/min is available (order analysis).
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Grid density
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If you activate this checkbox, VM-FFT will show grid lines at all graduation marks of the frequency axis.
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Permanent autoscaling
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If you activate this checkbox, VM-FFT will scale the frequency axis permanently in a way that all lines with more than 5% of the highest magnitude are visible.
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Step size
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The step size (shown in scale lengths) by which measurement curves and scale are shifted during a movement. For instance, 10% means that the measurement curves are moved by 1/10 of the frequency axis.
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Automatic scaling
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This button scales the frequency axis in a way that the signal is displayed with three periods of its main frequency.
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Compress / expand curve
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These buttons compress or expand the measurement curve.
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