BSL PRO Software Guide - Biopac

38 Part ARange GuideFigure 1 Figure 2 Figure 3The Range Guide is a green bar that runs along the vertical scale in the graph window for analog channels (fig. 1).It displays the maximum signal range for the Gain established for that channel. You can use the Range Guide as avisual aid to establish the proper Gain.The MP UNIT measures the actual input voltage andcompensates for the Gain. As Gain increases, the peak-to-peakof a waveform stays constant but the resolution increases.Proper Gain will have a smoothing effect on the signal.For the best resolution, establish Gain such that, allowing forbaseline drift (if applicable) and the maximum peak-to-peak ofthe signal, the maximum signal display is close to the maximumrange. If the signal is clipped (fig 2.), lower the Gain. If thesignal is small compared to the range (fig. 3), increase the Gainto improve signal resolution.Gain settings create a trade-off between range and resolution.Different gain settings applied to the same signal source showFigure 4thatHigher Gain better resolution + lower range (fig. 4, top)Lower Gain worse resolution + higher range (fig. 4, bottom)To display the full range (Fig. 2 vs. Fig. 4, for example), adjust the Vertical Scale.Gain guidelines are included in the MP UNIT Input and Offset Range table on page 692.The Range Guide will always reflect changes made to the channel Scaling.To quickly see the total range of each input channel, select Optimize Ranges from the Display menu. This willautomatically adjust the upper and lower viewable limits of the Vertical Scales for all channels.Visit the online support center at www.biopac.com