BSL PRO 4 Manual - Biopac

Part A — Getting Started 91263).Freq (or frequency) is only available in time domain windows.Results: This calculation will always return a positive result.Units: HzSample data file: “ValidateMeasurements.ACQ”IntegralMinimum area:2 samplesUses:All points ofselected areaResult: 8.33 Hz (for whole wave).Integral computes the integral value of the data samples between the endpointsof the selected area. This is essentially a running summation of the data.Integral is expressed in terms of (amplitude units multiplied by horizontal units)and calculated using the following formula.Where:n—number of samples;i—index (i = 1.n-1);n 1 i1Integral =fxf xii1xi2xi, x i 1x1- values of two neighboring points at horizontal axis ( – the firstx npoint, – the last point);f x f - values of two neighboring points of a curve (vertical axis); i, x i 1X n 1X x xx in- horizontal sample interval;1 - horizontal distance of increase at horizontal axis.The following plot graphically represents the Integral calculation.The area of the shaded portion is the result.Results: The Integral calculation can return a negative value if the selected areaof the waveform extends below zero.Units: Volts—sec.Sample data file:“ValidateMeasurements.ACQ”Result: 0.300 Volts -sec.(for first 6 sample points) and –0.155 Volts -sec.(for last 6 sample points—the wave belowzero).BSL PRO Manual