5-23
Making Measurements
Integrate
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 plot s the in tegra l of the so urce using th e "Trap ezoid al Rule ". Equa tion is as
follows:
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
co = arbitrary constant
i = data point index
In Delayed sweep horizontal mode, the ∫dt function does not display in the
delayed portion of the display.
•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 analog channel, or
math functions 1 + 2, 1 – 2, and 1 * 2.
Scale allows you to 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. P ress the Sca le softkey, then turn the
Entry knob to rescale ∫dt.
Offset allows you to set your own offset for the ∫Vdt math function. T he offset
value is i n unit-s econds wh ere unit s can be V (Volts), A (Amps), or W (Watts )
and i s r ep r e s en t e d by t h e ce n t e r g r a t ic u l e of t h e d is p l a y. Pr e s s th e Offset s o f tk e y,
then turn the Entry knob to change the offset for ∫dt.
n
In = co + ∆t ∑ yi
i=0