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App-8
IM 701210-06E
Appendix 3 How to Calculate the Area of a Waveform
Integ2XY
(1) When Only One Y Data Corresponds to X Data
1
3
Start Point
Stop Point
S
0
Area S=S
0
X Axis (Y=0)
X Axis (Y=0)
Area S= –S
0
Stop Point
Start Point
S
0
2
4
Stop Point
Start Point
S
0
Area S=S
0
–S
1
X axis (Y=0)
X Axis (Y=0)
Area S=S
0
Start Point
Stop Point
S
0
(2) When the Waveform Extends into the Negative Side
X Axis (Y=0)
S
0
S
1
Start Point
Stop Point
(2) When Two or more Y Data Correspond to X Data
X Axis (Y=0)
S
0
Start Point
Stop Point
Area S=S
0
X Axis (Y=0)
S
0
Stop
Point
Start Point
Area S=S
0
+2
×
S
1
+S
2
S
1
S
2
Area S= –S
0