Measurement
Any of the supported measurements (e.g. pressure, velocity, intensity) may be selected for display in either or both plots.
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. Scale adjustments are also available via Menu (macOS) or Keyboard commands.
Spectrum Vertical Axis
Three vertical scale types are available for viewing the measurement magnitude: Linear,
Logarithmic, and dB.
Spectrum Type
Spectral data can be display in whole or 1/3-octave frequency bands, or as narrowband (FFT) data.
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.
FFT Frequency Axis
Two narrowband frequency scale types are available for viewing spectra: Linear and
Logarithmic. When the spectrum type is Octave, the frequency axis is always logarithmic.
Frequency Units
This segmented control lets you choose whether to display frequencies in Hz or cpm (cycles or revolutions 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.