BSL PRO 4 Manual - Biopac

308 BSL PRO ManualSettingsPlot color Colorwell that changes the color used to draw the spectrum in the palette. Click to display astandard color picker.Window Width specifies the window size used when performing analyses in real-time mode. Thespectrum will always reflect the frequency characteristics of the most recently acquired dataof the graph, using this window size as the number of sample points to use. This popup willlist various powers of two as well as a “Custom...” entry. If a custom width is entered that isnot a power of two, padding will be applied during real-time operation according to the FFTOptions.FFT OptionsPadding—used whenever the number of input points is not an exact power of two. Data canbe padded either with zero or with the amplitude of the last data point.Remove mean—Subtracts the mean value of the data is prior to frequency analysis. Thishelps remove the zero frequency component caused by DC offset.Remove trend—Connects the endpoints of the data with a line and removes this linear trendfrom the data prior to frequency analysis. This can help compensate for drifting baselines.Units—control whether the data is displayed using a logarithmic scale or a linear scale.Window—enables the standard BSL PRO windowing options, to adjust the data to removeeffects resulting from the discontinuities of data at the two edges.Value Click the crosshair icon to display the frequency and amplitude values of the spectrumwhen moved within the spectrum display. The mouse cursor will change to a crosshair wheninside the spectrum plot. The frequency and amplitude values corresponding to the mouseposition are displayed above the spectral plot. Hold the mouse button down to display theamplitude of the spectrum at the horizontal mouse position, along with a crosshair cursorhighlighting the exact location shown on the spectrum. If the active spectrum is compressed(that is, if multiple samples exist for a particular horizontal position), the value extracted willbe the maximum value displayed at that pixel position.Zoom Click the magnifying glass to perform zoom operations. Click and drag the mouse cursor(which will change to a magnifying glass) in the plot display to select the area to zoom in on.Alternately, click either of the axes of the spectrum palette to display a dialog used to enterdisplay ranges manually. Enter the start and end points of the desired range for each axis.There are no grids in the spectrum analyzer palette, so the axis scaling dialogs of graphs arenot applicable. Note: adaptive scaling will be disabled for the spectrum display when eitherthe zoom tool or the axis endpoint entry dialogs are used.Visit the online support center at www.biopac.com