Differentiate d/dt (differentiate) calculates the discrete time derivative of the selected source. You can use differentiate to measure the instantaneous slope of a waveform. For example, the slew rate of an operational amplifier may be measured using the differentiate function. Because differentiation is very sensitive to noise, it is helpful to set acquisition mode to Averaging. d/dt plots the derivative of the selected source using the "average slope estimate at 4 points" formula. The equation is: di = yi+4 + 2yi+2 ? 2yi?2 ? yi?4 8 Δ t Where: ? d = differential waveform. ? y = channel 1, 2, 3, 4, or Math (lower math function) data points. ? i = data point index. ? Δt = point-to-point time difference.
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