BSL PRO Software Guide - Biopac

242 Part Dwithin the channel tracks in the chart mode) and adjusts the units per division on the vertical axis sothat the waveform fills approximately two-thirds of the available area.In Chart mode, the screen is evenly divided into horizontal channel tracks and each waveform isautoscaled to fit the division without overlapping. To apply to only the selected waveform, hold theCTRL key down before selecting Autoscale waveforms.In Scope mode, if more than one channel is active, the channels will overlap but each waveform will autoscale asif it were the only waveform in the display. This is useful when overlapping waveforms that have different unitsand scales. The vertical scale shown is that of the active channel; to change the scale, select another channel.Optimize RangesWhen Optimize Ranges is selected from the Display menu, the Vertical Scales will be automatically adjustedfor all channels that have a Range Guide (green band) showing, such that the range limits are set to the upper andlower viewable limits of the Vertical Scales. This allows you to quickly see the total Range of each inputchannel. This menu item is active when data is present AND at least one data channel has an active RangeGuide.This item is also selectable using the toolbar icon or the right-click mouse shortcut. When selected with theicon or the right-click, this item only optimizes the Range Guide of the active channel.Note: The Range Guide is the green vertical band that appears in the Vertical Scale region foranalog input channels only (not for duplicated, copied/pasted, or Calculation channels); see page 738.Overlap WaveformsIn Scope mode, when Overlap waveforms is selected, all the currently displayed waveforms are “overlapped”into one graph window with the same vertical scale and offset. This allows you to compare waveforms by settingall channels to the same vertical scale. The overall chosen scale for all the displayed waveforms will be afunction of the pk-pk value of the combined waves. Overlap Waveforms is best used when comparing similarunits. One use, for example, is to examine the calculated diastolic, systolic, and mean calculation channels“overlapped” with the raw blood pressure waveform.Compare WaveformsIt is often useful to compare multiple waveforms by placing them all on the same amplitude (vertical)scale, but discount the effect of waveform offset (or baseline). Compare waveforms will automaticallyset the scale to be the same for all channels, and adjust the offset for each channel to center alldisplayed waves. The scale of all the displayed channels is determined by the channel with the largestpk-pk range in the display interval.Before Compare Waveforms After Compare WaveformsThe preceding example shows two waveforms that appear to have approximately the same magnitude beforeCompare waveforms is performed. After using Compare waveforms, you can easily see that the magnitude isnot actually the same — one waveform (the sine wave) has a significantly greater baseline and range relative tothe other (noise) waveform.Visit the online support center at www.biopac.com