Math Waveforms 4
Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide 77
• "FFT Measurement" on page 81
• "Square Root" on page 88
With the DSOX3ADVMATH advanced math measurements license, these
additional transforms are available:
• "Ax + B" on page 88
• "Square" on page 89
• "Absolute Value" on page 90
• "Common Logarithm" on page 90
• "Natural Logarithm" on page 91
• "Exponential" on page 91
• "Base 10 Exponential" on page 92
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 (see "Selecting the Acquisition Mode" on
page 191).
d/dt plots the derivative of the selected source using the "average slope
estimate at 4 points" formula. The equation is:
Where:
• d = differential waveform.
• y = channel 1, 2, 3, or 4, or g(t) (internal arithmetic operation) data
points.
• i = data point index.
• Δt = point- to- point time difference.
d
i
=
y
i+4
+2y
i+2
−2y
i−2
− y
i−4
8Δt
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