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• <br />s <br />EVENT WAVEFORMS <br /> <br />TRANSVERSE VERTICAL LONGfrU01NAL MAGNITUDE <br /> <br />T V L PEAK <br />VECTOR <br /> -0.34 -0.33 0.14 0.494 <br /> _ 0.38 -0.a7 ~ 0.38 0.714 <br /> 0.29 -0.31 0.57 0.663 <br /> <br />-- <br />- <br />_ •0.53 0.23 -0.31 0 655 <br /> 0.2a 0.07 ~ 0.36 0.4a <br /> -0.27 -0.76 -0.75 0.316 <br /> <br />Figure ~.1: Calculating the Peak Vector Sum. <br />5.5.2 Sound Pressure <br />The Blas[Mate 111 calculates two sound pressure indicators. peak sound pressure and zero crossing <br />frequency. <br />a. Peak Sound Pressure (PSP) <br />The BlastMa[e III checks the entire event waveform and displays [he largest sound pressure called <br />the Peak Sound Pressure (PSP), also referred to as the Peak Air Over-Pressure. Results appear on <br />the BlastMate 111 display and in the Event Summary Report. <br />b. Zero Crossing Frequency (ZC Freq) <br />The Zero Crossing Frequency calculation (or sound pressure is the same calculation used for <br />oround vibra[ions. Please see above for a comple[e discussion. <br />(Vote: The Zero Crossins Frequency calculation is performed for Linear microphones only. <br />This calculation does not appear on the Blas[Afate I11 display or on Event Summan• <br />Reports when using an "A" Weight microphone. <br />C~ <br />5--10 Blas[Mate III Operator Manual <br />