____Amplitude, A, is the greatest measured voltage in a waveform and is measured in decibels (dB). Rise time, R, is the time interval between the first threshold crossing and the signal peak. This parameter is related to the propagation of the wave between the source of the acoustic emission event and the sensor. Duration, D, is the time difference between the first and last threshold crossings. Duration can be used to identify different types of sources and to filter out noise. MARSE, E, is the measure of the area under the envelope of the rectified linear voltage time signal from the transducer. MARSE is also sensitive to the duration and amplitude of the signal, but does not use counts or user defined thresholds and operating frequencies. Counts, N, are the number of pulses emitted by the measurement circuitry if the signal amplitude is greater than the threshold. Depending on the Amplitude of the AE event and the characteristics of the material, one hit may produce one or many counts. It is a relatively simple parameter to be collected, and very useful to be combined with amplitude and duration time to provide AE signal quality information.