Hioki MR8740-50, Instruction Manual

Page: 159 / 238

153
Numerical Calculation Types and Descriptions
Calculation
type
Description
Area
Method :
Negative
(Only the
negative-
amplitude part)
Calculates an area enclosed by the zero-level
(zero-potential) line and the negative-amplitude
part of a signal waveform.
When the range is specified, calculates the area
between the cursors.
S
: Area
n
: Number of data points
di
:
i
th data point acquired
across the channel
h
=
Δt
: Sampling interval
di
•
h
S
=
∑
i = 1, di < 0
n
sss
2
ss
2
Cursor A
Cursor B
S
= −
s
2
X-Y area
Method :
Coordinate
method
Calculates the area (unit: V 2 ) of the figure enclosed by the X-Y composite curve. The
instrument calculates an area enclosed by the lines as illustrated below. An area can be
calculated even when no X-Y composite curve is displayed.
You can specify a calculation range on the horizontal axis (time-axis) waveform of each
channel with the cursors. The area of the X-Y composite curve is calculated within the
specified range (you cannot directly specify the range on the X-Y waveform with the
cursors).
Refer to “2.1 Reading Measured Values (Trace Cursors, Horizontal cursor)” (p. 20).
s
0
s
0
s
0
s
1
s
1
s
0
When multiple loops plot When an open curve plots
When a figure of eight plots When a spiral loop plots
S
=
n
×
s
0
S
: Area
n
: Number of loops
S
=
s
0
S
: Area
(Closed area is created
by connecting the start
and end points with a
straight line.)
Start point, end point
Start
point
End point
Start
point
End
point
Start
point
End point
S
= |
s
0
−
s
1
|
S
: Area
S
=
s
0
× 2 +
s
1
S
: Area
(The number of
overlapping segments
increases with a loop
count.)
X-Y area
Method :
Trapezoidal
approximation
Calculates an area (unit: V
2
) enclosed by an X-Y composite curve using the trapezoidal
approximation method. The instrument calculates an area enclosed by the lines as
illustrated below. An area can be calculated even when no X-Y composite curve is
displayed.
You can specify a calculation range on the horizontal axis (time-axis) waveform of each
channel with the cursors. The area of the X-Y composite curve is calculated within the
specified range (you cannot directly specify the range on the X-Y waveform with the
cursors).
7
Numerical Calculation Function