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• <br />e requency. <br />b. Damping -Overawing Ratio (OR) <br />The overstvin_ ratio (OR) measures damping and is calculated by computing the ratio of the <br />magnitude of adjacen[ waveform peaks according to [he followine formula: <br />A, <br />OR= A, <br />Acceptable overawins ratios range from 2.8 to 4.8. The figure below displays a ¢raph of a <br />geophone coil's "free fall" response. A, and A_ are used for overawing calcula[ions. <br />• <br />Kano. <br />5.3.2 Checking the Microphone <br />Sensorcheck tests the microphone's operation by sending a signal to the microphone and <br />measuring its frequency and amplitude response. if the results of the test fall within specified <br />ranges, the microphone is within calibra[ion. <br />5.3.3 Sensorcheck Report <br />The Sensorcheck report appears on the Blastfvlate III display. The message "All Channels <br />working. Press Print to Print" indicates the BlastMate III sensors have passed the Sensorcheck. <br />5.4 Antialias Filters <br />Aliasing occurs when a hish-frequency signal appears as an ertoneous low frequency because the <br />waveform was sampled at too low a sampling ra[e. An an[ialiasing filter solves this problem by <br />• removing the high-frequencies. <br />5-6 BlastMa[e III Operator Manual <br />