BSL PRO 4 Manual - Biopac

124 BSL PRO ManualRate CalculationThe Rate Calculation is used to extract information about the interval between a series of peaks in awaveform. This interval can be scaled in terms of BPM (the default), frequency (Hz), or time interval betweenpeaks.‣ The BPM (or beats-per-minute) Rate function is used as a measure of peaks or events that occur in asixty-second period.‣ The frequency rate function is commonly used to describe the periodicity of data, or the amount oftime it takes for data to complete a full cycle (from one peak to the next peak).‣ The Interval Rate function returns the raw time interval between each adjacent pair of peaks, whichis essentially the inter-beat interval (IBI), frequently used in cardiology research.These three functions essentially provide the same information in different formats, since a frequency of 2Hzis equal to an inter-peak interval of 0.5 seconds, both of which are equivalent to a BPM of 120. Other optionsallow you to record the maximum or minimum value of all peaks (the peak max/min option), or to count theaggregate number of peaks (the count peaks option).In order to calculate Rate information, you have the option of specifying the threshold manually or havingBSL PRO automatically compute the threshold value (which is the default). This section describes the basicparameter settings for typical online Rate Calculations.NOTE: Parallel functions can be performed after data has been acquired. Adetailed description of the Rate Calculation options can be found in the FindRate section on page 280.To perform a Rate Calculation in real time:1. Choose MP > Set Up Channels.2. Click the Calculation tab.3. Check an Acquire box for the Calculation channel you want to contain the filtered data. You may alsocheck the Plot and Values boxes as appropriate for each channel.4. Click the Preset pull-down menu and select Rate.5. Click the Setup button in the Input Channels dialog to generate the Rate dialog.Visit the online support center at www.biopac.com