BSL PRO Software Guide - Biopac

102 Part Cmay be closer or further from the expected rates.Windowing Units are related to the selected “Function.”Rate Functions related to peak or peak time specify the unit after the Function. This is a fixedunit, so the Windowing Units menu will be disabled.Rate Functions related to data within a cycle can be specified in units of frequency (Hz) or time(BPM or seconds). The Windowing Units menu will be enabled,a nd when a unit is selected thesoftware will convert the Min and Max settings to the selected units.See also: Application Note #142 for further information.Rate > Function OptionsThe Function pull-down menu of the Rate dialog includes the following options:AreaCount peaksInterval (sec)Mean valuePeak maximumPeak minimumPeak to peakPeak time (sec)Computes the area of the signal between two peaks, on a cycle-by-cycle basis.This peak counting function produces a plot of the number of peaks (on the vertical axis) vs.time (on the horizontal axis). When used with the delta measurements (in the measurementwindows), this is a convenient way to calculate how many peaks occur within a selected area.Returns the rate value scaled in terms of a time interval (sec), which is computed as the timedifference (delta T) between the two peaks. This is sometimes referred to as the inter-beatinterval or IBI. This measurement is perfectly correlated with the BPM calculation.Computes the mean of a pulsatile signal on a cycle-by-cycle basis between two peaks. It willalso produce a staircase plot.Tracks the value of the peak. Peak maximum correlates to the systolic pressure in bloodpressure readings (the ECG R-wave).Peak maximum locks the “Peak detect” option of the dialog to “Positive” and Peakminimum locks it to “Negative.”Determines the amplitude of a pulsatile signal. It looks at the vertical difference between themaximum and minimum values of the waveform on a cyclical basis.Returns the time (in seconds) at which the peak occurred. Like the other rate functions (e.g.,BPM and Hz), the value of the last peak time will be plotted until a subsequent peak isdetected. The resulting plot will resemble a monotonically increasing “staircase” plot.Rate (BPM) Equal to 60 times the frequency calculation, or 60/delta T.Rate (Hz)Returns the rate value scaled in terms in Hertz (Hz), which is computed by dividing 1 by deltaT. This frequency measurement is perfectly correlated with the BPM calculation.Visit the online support center at www.biopac.com