BSL PRO Software Guide - Biopac

226 Part DFind Peak (Peak Detector options)The Find Peak function is the primary tool used for waveform data extraction or reduction. It can be used on aselected area or the entire data file. This function can automatically analyze the data based on user-definedtime intervals.The peak detector provides a variety of mechanisms to automatically control the I-beam selection tool. In otherwords, Find Peak can be used to automate tasks which otherwise would have to be performed manually using theI-beam selection tool and the respective pop-up measurements.There are two basic methods by which the Peak Detector operates. Both of these modes provide powerfulstrategies for reducing data.Find Peak: Positive peak or negativepeak‣ Useful for automaticallyanalying in-vitro tissue bathdata, spike counting, ECGanalysis, and EMGanalysis.Find Peak: User Defined Interval‣ Useful for hemodynamicdata, psychophysiologicaldata, sleep data, and anyother applications wheremeasurements need to betaken at pre-definedintervals.Places the cursor (or selected area) at a a specified time offset to locatepositive peaks or thresholds or negative peaks (valleys) in the data file.Use when you want the waveform data itself to drive the waveform datareduction process.In this mode, the algorithm will find positive or negative peaks orthresholds and move the I-beam to that found peak or threshold, offset intime by some fixed time delta. If the pop-up measurements are set tocertain functions, the value returned by those functions will be present inthe respective pop-up measurement result box.Places the cursor (or selected area) at a specified time offset to regular,pre-specified time intervals.This mode is very useful when the waveform data reduction requirementsnecessitate examining the data around many equally sized data segments.This mode is very similar to the “Find Peak: positive peak or negativepeak” mode, but instead of referencing the I-beam to a peak or thresholdin the data, the algorithm will reference the I-beam to pre-selected timeintervals which can be set to “chop” the waveform data into equalchunks. TIP See Application Notes PS161 In-Vitro Tissue Bath Data Analysis and PS148 ECGComplexes. Application Notes are available through our web site, or contact BIOPAC fora hard copy.Visit the online support center at www.biopac.com