Keysight DSOX3012T, User Manual

Page: 105 / 530

Math Waveforms
5
Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide 105
• “Natural Logarithm" on page 116
• “Exponential" on page 117
• “Base 10 Exponential" on page 117
Differentiate
d/d t (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 221).
d/d t 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, 4, or Math 1, Math 2, Math 3 (lower math function) 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