Keysight Technologies InfiniiVision 3000 X Series, User Manual

Page: 79 / 432

Math Waveforms
4
Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide 79
• "Absolute Value" on page 92
• "Common Logarithm" on page 92
• "Natural Logarithm" on page 93
• "Exponential" on page 93
• "Base 10 Exponential" on page 93
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 189).
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.
•
Δ
t = point-to-point time difference.
d
i
=
y
i +4
+ 2 y
i +2
− 2 y
i −2
− y
i −4
8 Δ t