BSL PRO Software Guide - Biopac

170 Part DMEASUREMENT Area EXPLANATIONUses:All points ofselected areaFor the selected area, Value indicates the value at the last position of thecursor, corresponding to the direction the cursor was moved (the value willbe the left-most sample point if the cursor was moved from right to left).Units: VoltsX-axis:T/F/X(horizontalunits)Cap_DimMac onlyCorr_DimMac onlyEvt_ampMac onlyEvt_countMac onlyMinimum area:1 sampleUses:All points ofselected areaThe X-axis measurement is the exact value of the selected waveform atthe cursor position, based on the Horizontal Axis setting:Measurement Horizontal Axis SettingUnitsX-axis: T Time Sec.X-axis: F Frequency Hz.X-axis: X Arbitrary units Arb. unitsFor X-axis: T measurements, the time value is relative to the absolutetime offset, which is the time of the first sample point.The X-axis: F measurement applies to frequency domain windows only(such as FFT of frequency response plots). The Freq function for timedomain windows is described on page 7165.Note: If a range of values is selected; the measurement will indicate thehorizontal value at the last position of the cursor.Results: This calculation will always return a positive result.Capacity Dimension; fractal dimension estimate.(Fractals measure the amount of self-similarity in a data set.AcqKnowledge offers three alternate estimates for fractal dimension:Cap_Dim, Corr_Dim, and Inf_Dim. The estimates will not agree, based onthe heuristic and the parameters.)Correlation Dimension; fractal dimension estimate. Always greater thancapacity if parameters are the same. (See fractals note at Cap_Dim.)Extracts the value of the measurement channel at the times where eventsare defined. The measurment result is unitless. Specify Type, Location,and Extract.The amplitude is always taken from the measurement channel, which maybe different from the channel on which events are defined.Evt_amp can be useful for extracting information such as the average Twave height within the selected interval.Evaluates the number of events within the selected area. Themeasurement result is unitless. Specify Type and Location.Evt_locMac onlyExpressionMac onlyInf_DimMac onlyKurtosisMac onlyMomentMac onlyUses:All points ofselected areaExtracts information about the times of events. The measurement resultuses the units of the horizontal axis. Specify Type, Location, and Extract.Generates the Expression transformation dialog (page ) and offers Source“MC” Measurement Channel instead of “SC” Selected Channel to buildrecursive formulas, i.e. result of the expression as it was evaluated xsamples ago. Data within the selected area is not changed.Information Dimension; fractal dimension estimate. (See fractals note atCap_Dim.)Kurtosis indicates the degree of peakedness in a distribution, e.g. the sizeof the “tails” of the distribution.Central Moment is a general-purpose statistical computation that can beused to compute central variance and other higher-order moments of thedata within the selected area.Visit the online support center at www.biopac.com