User`s guide

Making Measurements 4
5000 Series Oscilloscope User’s Guide 163
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, or function 1 + 2, 1 – 2, and 1 * 2 data points
c
o
= arbitrary constant
i = data point index
In Zoom mode, the ∫ dt function does not display in the zoomed
portion of the display.
1 Press the Math key, press the ∫ dt softkey, then press the
Settings softkey if you want to change the source, scaling, or
offset for the integrate function.
• Source — selects the source for ∫ dt. The source can be any
oscilloscope channel, or math functions 1 + 2, 1 – 2, and
1*2.
• 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.
n
I
n
= c
o
+ ∆t ∑ y
i
i=0