Measurements and Math Functions 5
InfiniiVision 7000B Series Oscilloscopes User’s Guide 193
Integrate
dt (integrate) calculates the integral of the selected source. You can use
integrate to calculate the energy of a pulse in volt- seconds or measure the
area under a waveform.
dt plots the integral of the source using the “Trapezoidal Rule”. The
equation is:
Where
I = integrated waveform
t = point- to- point time difference
y = channel 1, 2, 3, or 4, or g(t) (internal arithmetic operation)
c
o
= arbitrary constant
i = data point index
1 Press the [Math] key, press the Function softkey and select f(t), press the
Operator softkey and select dt. Press the Source, Scale, or Offset sofkeys
if you want to change the source, scaling, or offset for the differentiate
function.
• Source — selects the source for dt. (See page 184 for information
about using g(t) as the source.)
• Scale — lets you set your own vertical scale factors for dt expressed
in unit- seconds/division, where units can be V (Volts), A (Amps), or
W (Watts). Units are set in the channel Probe Menu. Press the Scale
softkey, then turn the Entry knob to rescale dt.
• Offset — lets you set your own offset for the Vdt math function. The
offset value is in unit-seconds where units can be V (Volts), A
(Amps), or W (Watts) and is represented by the center horizontal
grid line of the display. Press the Offset softkey, then turn the Entry
knob to change the offset for dt. The integrate calculation is relative
to the source signal’s offset. The following examples illustrate the
effects of signal offset.
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