The Dual FFT Analyzer includes two plots for displaying measurement information. The information displayed can be chosen independently for each plot. The lower plot can be hidden completely.
Display Options
- Measurement
Any of the supported measurements may be selected for display in either or both plots. - Unwrap Phase
The Unwrap Phase switch enables you to select whether you would prefer to keep the phase response plot wrapped between + and - 180 degrees, or unwrapped.
Scale Options
- Autoscale
Autoscale enables the vertical scale and range to be set automatically, which can make it easier to keep the live signal(s) visible in the plot. Sometimes, when a measurement doesn't appear as expected, setting Autoscale to Auto can solve the problem. When autoscale is off, the vertical scale of the plot can be manually adjusted by a two-finger pinch gesture within the axis label region of the plot. The range can be adjusted by a single-finger slide gesture within the axis label region. - FR Mag Vertical Axis
Three vertical scale types are available for viewing the transfer function magnitude: Linear, Logarithmic, and dB. - Sq IR Vertical Axis
Three vertical scale types are available for viewing the squared impulse response function magnitude: Linear, Logarithmic, and dB. - Vertical Scale
Tap on Vertical Scale to select a vertical scale for the plot in standard units per division. If the corresponding Vertical Axis type is Lin, Autoscale will be turned off. -
dB Vertical Scale
Tap on dB Vertical Scale to select a vertical scale for the plot in dB per division. If the corresponding Vertical Axis type is not Lin, Autoscale will be turned off. - Horizontal Axis
Two horizontal scale types are available for viewing spectra: Linear and Logarithmic. The desired scale type is determined by the selection of this control. - Frequency Units
This segmented control lets you choose whether to display frequencies in Hz or cpm (cycles per minute).
Cursor Options
- Harmonic Cursors
Additional vertical cursors may be automatically placed at harmonics (integer multiples) of the current (fundamental) cursor frequency (enter a value up to 128). - Horizontal Bar
When working with multiple channels in the Dual FFT Analyzer tool, this option lets you choose which channel the horizontal cursor bar will be associated with. - Peak Track
The cursor may be configured to automatically move to the frequency of the peak value within the current spectrum. This option allows the peak track function to be disabled, or to track the maximum or minimum peak within the spectrum. A triple tap or triple click within the graph will advance the peak track selection. -
Peak Track Channel
When working with multiple channels in the FFT analyzer, this option lets you choose which channel the peak track function will apply to (the channel whose spectral peak will be tracked by the cursor).
Imported Data
- Trace Opacity
Use this slider control to adjust the opacity of static data traces (loaded from data files) in the plot. - Trace Thickness
This segmented control can be used to select the thickness of the static frequency data traces in the plot.