Math
155
𝑛
𝐼
𝑛
=
𝑐
0
+
Δ𝑡
+
∑
𝑦
𝑖
𝑖
=0
13.3.2
Integrate
The MATH operation dt (integration) calculates the numerical integral of the selected source. (
∫
𝑑𝑡
) calculates the
integral of the
waveform’s
data using the trapezoidal rule. The equation is:
Where:
•
I = integrated waveform
•
Δt
= point- to- point time difference
•
y = channel 1, 2, 3, or 4 data points
•
co = arbitrary constant
•
i = data point index
The integrate operator provides an
Offset
softkey that lets you enter a DC offset correction factor for the input signal.
Small DC offset in the integrate function input (or even small oscilloscope calibration errors) can cause the integrate
function output to
ramp
up or down. This DC offset correction lets you level the integrate waveform.
No Offset
Offset
Figure 13.7
Integral Operation
In addition, the integral operation can be performed within a specified gate. Touch
Gate
area in the math menu, and
enable gate function, then set Gate A and Gate B to define the gate. The setting of the gate cursors is similar to that
of normal cursors. See Select and Move Cursors for details.
