BSL PRO 4 Manual - Biopac

296 BSL PRO ManualAutoscale WaveformsThe primary use of Autoscale is to make all of the data ofthe channel within the current time range visible on thescreen.When Autoscale Waveforms is selected, BSL PROdetermines what the “best fit” is for each displayedwaveform. The percentages and midpoints are identicalwhether grids are locked or unlocked.The software adjusts the vertical offset so that each channel is centered in the window (or within the channeltrack in chart mode) and adjusts the units per division on the vertical axis so that the waveform fillsapproximately two-thirds of the available area. In chart mode, the waveforms are autoscaled to fit theirsections. In scope mode, the screen is evenly divided into horizontal “bands” and each waveform is scaled tofit the division without overlapping. The autoscaling algorithm for Chart mode and X/Y mode is:1. Find maximum value of the channel in the time area, max.2. Find minimum value of the channel in the time area, min.3. If grids are locked, adjust scale such that max-min occupies 75% of the channel's track in Chart mode,or 75% of the entire plotting area X/Y mode.4. Adjust the midpoint so (max-min)/2 is at the vertical center of the channel's track in Chart mode, orvertical center of the entire plotting area in Scope and X/Y modes.Before autoscaling LVP channelAfter autoscaling LVP (red lines for illustration only) The autoscaling algorithm for Scope mode is:1. Divide the plot height into m equal sections of height h each.2. Assign each visible channel to one of these plot sections.3. If grids are locked, Scale the waveform such that the range between the max and min values willoccupy 75% of h.4. Place the midpoint between the max and min at the center of the waveform's section.In scope mode, the screen is evenly divided into horizontal “bands” and each waveform is scaled to fitthe division without overlapping.Note: Autoscaling a single channel in Scope mode results in that channel occupying 1 /(num_visible_channels) of the overall waveform plotting area. It will be autoscaled into the topmostdivision of the screen.Before autoscaling in Scope modeAfter autoscaling in Scope (red lines for illustration only)Visit the online support center at www.biopac.com